JP6536065B2 - A bag having a container filled with a fluid and a method of manufacturing the same, and a bag having a container filled with a fluid and a method of manufacturing the same - Google Patents

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a bag having a container filled with a fluid and a method of manufacturing the same. The present invention also relates to a bag whose container is filled with a fluid and a method of manufacturing the same.

  A bag made of a soft packaging material is used as a bag for containing a fluid having fluidity, such as liquid or powder, or a fluid including a solid such as confectionery. In general, a bag for containing a fluid forms a seal such as a side edge seal or a lower edge seal by thermally welding together a front surface film and a rear surface film each having a thermoplastic resin layer on the inner surface. It is obtained by At this time, normally, the top film and the back film are not heat-welded at the upper part of the bag, thereby forming an opening at the upper part of the bag. Next, the interior of the bag is filled with the fluid through the opening. Thereafter, the top film and the back film are again heat-bonded to each other at the top of the bag to form an upper edge seal at the top of the bag, thereby sealing the bag. In this way, a bag filled with fluid is obtained.

  Patent Document 1 discloses an example of this type of bag. In the bag disclosed in Patent Document 1, the side edge seal portion and the lower edge seal portion are formed by heat-sealing the front film and the back film, thereby defining a container portion filled with the fluid. Ru. In this bag, an outlet is formed at the upper corner of the bag. The outlet portion is a portion provided to adjust the flow of the fluid when taking out the fluid from the bag, and has a narrower width than the housing portion. In patent document 1, the flow path of the fluid in an extraction part is formed between a pair of seal part extended along the removal direction of a fluid. Further, in Patent Document 1, the outlet for taking out the fluid to the outside breaks a part of the outlet extending along the take-out direction along the scheduled opening part extending in the direction substantially orthogonal to the take-out direction. Formed by

  Such an outlet is generally integrally formed with the housing from the same soft packaging as the front and back films. When the fluid is taken out, the pressure from the fluid increases the distance between the top film and the back film, thereby securing the flow path of the fluid at the outlet. In addition, the presence of the fluid inside the outlet increases the rigidity of the outlet during the removal of the fluid. Therefore, it is important to form the outlet in such a way that the pressure from the fluid causes the distance between the top film and the back film to widen, and the spread state is maintained. For example, in Patent Document 1, embossed portions extending along the direction of taking out the fluid are provided on the front film and the back film constituting the taking-out part, thereby enhancing the rigidity of the respective films, and thereby between the respective films. The distance between the two is kept stable. This prevents the outlet from closing when taking out the fluid.

Patent No. 4876561

  However, as described above in Patent Document 1, the flow path of the fluid at the outlet portion is formed between the pair of seal portions extending along the fluid removal direction. This means that the front film and the back film are in close contact with each other on both sides of the flow path of the fluid at the outlet, and therefore the distance between the front film and the back film in the flow path is sufficiently increased. It means that still is not easy. That is, the flow passage of the fluid in the outlet portion can not be secured sufficiently large, and the amount of the fluid located in the outlet portion when taking out the fluid is small, and hence the rigidity of the outlet portion is sufficient. It means that it is difficult to secure. Therefore, there is room for improvement in the removability.

  Further, in the bag of Patent Document 1, after the inside of the bag is filled with the fluid through the opening at the upper part of the bag, the upper part of the bag is heat-welded to close the opening to close the opening. Form. By the way, when taking out the fluid filled in the storage part, as one of the flow paths of the fluid, first move from the storage part to the upper part of the bag, and then along the upper edge of the bag toward the outlet part It is possible to consider a flow path that moves and is taken out from the outlet of the outlet. On the other hand, if the upper edge of the bag is constituted by the upper edge seal, that is, if the front film and the back film are in close contact with each other at the upper edge of the bag, then the front film and the back surface in the region inside the upper edge seal. It is believed that the distance between the film and the film becomes narrow. This means that the flow path of the fluid from the upper part of the bag to the outlet part is reduced, and the amount of the fluid that can be stored in the upper part of the bag is reduced. That is, the flow rate of the fluid flowing into the outlet can not be sufficiently large, which means that the rigidity of the outlet can not be sufficiently ensured. Therefore, the removal of the fluid from the outlet can be adversely affected.

  When the outlet and the upper edge seal are formed in the upper portion of the bag as in the bag of Patent Document 1, the length of the outlet is made sufficiently large, whereby the function of rectifying the fluid is obtained. If it is going to secure enough, the size of the upper edge seal will be reduced accordingly. This means that the size of the opening used for filling the container into the fluid is reduced, which results in a reduction in the efficiency of the fluid filling operation.

  The present invention has been made in consideration of such problems, and it is an object of the present invention to provide a bag which can improve the extractability of a fluid and is excellent in filling aptitude.

  According to a first aspect of the present invention, there is provided a bag having a container filled with a fluid, the bag comprising at least a front film and a back film, the outer edge of the bag having an upper edge and a lower surface opposite to the upper edge. A laminate including a rim and a pair of side rims extending between the upper rim and the lower rim, the upper rim comprising at least a portion of the top film and at least a portion of the back film A folded portion formed by folding back the film is at least partially included, and the surface film and the back film pass when the fluid flowing along the folded portion of the upper edge is taken out to the outside An outlet portion is formed, and the storage portion is formed between the inner surface of the front film and the inner surface of the back film by heat welding along the lower edge and the pair of side edges of the bag. Of the front surface film and the back surface film, at least the front surface film of the front surface film and the back surface film has an opening which penetrates the front surface film than the sealing portion which forms the housing portion. The bag further comprises a closing member attached to the inner surface of the face film so as to at least partially overlap the opening, the closing member being formed at least partially in an inner position. The first layer comprising the first surface opposite to the surface film and the second surface opposite to the first surface, the first layer constituting the first surface of the closing member being at least partially A bag made of a material that can be heat welded to the inner surface of the surface film.

  In the bag according to the first aspect of the present invention, the container filled with the fluid is formed, wherein the second layer constituting the second surface of the closing member constitutes the first layer of the closing member The material may have a melting point higher than that of the Alternatively, the second surface of the closing member may be provided with an inhibitor that inhibits heat welding from occurring with the inner surface of the back film.

  According to a second aspect of the present invention, there is provided a bag having a container filled with a fluid, the bag comprising at least a front film and a back film, the outer edge of the bag having an upper edge and a lower surface opposite to the upper edge. A laminate including a rim and a pair of side rims extending between the upper rim and the lower rim, the upper rim comprising at least a portion of the top film and at least a portion of the back film A folded portion formed by folding back the film is at least partially included, and the surface film and the back film pass when the fluid flowing along the folded portion of the upper edge is taken out to the outside An outlet portion is formed, and the surface film includes at least a first portion and a second portion adjacent to each other across an opening penetrating the surface film, the first portion and the front portion In the second part, a contact state in which the inner surface of the first part and the inner surface of the second part are in partial contact, and a gap is formed between the inner surface of the first part and the inner surface of the second part A bag configured to be capable of being in an open position.

  In the bag according to the present invention, in which the container filled with the fluid is formed, the folded portion of the upper edge may be formed in an arc shape.

  In the bag according to the present invention, in which the fluid-filled container is formed, the distance from the lower edge to the upper edge is from one side edge to the other side edge of the pair of side edges. And the outlet portion may be formed on the side of the one side edge of the pair of side edges of the front surface film and the back surface film.

  In the bag according to the present invention, in which the container filled with the fluid is formed, the outlet portion is formed with an opening scheduled portion to be an outlet by being opened, and along the folded portion Flowed fluid may be withdrawn from the outlet.

  In the bag according to the present invention in which the fluid-filled container is formed, the opening is formed in the surface film from one side edge of the pair of side edges to the other side edge. The upper edge may extend substantially parallel to the opening.

  The present invention is a method of manufacturing a bag having a container filled with a fluid, wherein the container is formed by heat welding along the lower edge and the pair of side edges of the bag and the inner surface of the surface film. The method for manufacturing the bag includes the steps of preparing a laminated film including a thermoplastic resin layer constituting the inner surface and a base material layer, which is defined inside the seal portion formed between the inner surface of the back film and the inner surface of the back film. At least a portion of the back film integrally formed with at least a portion of the surface film and at least a portion of the surface film via the folded portion by folding the laminated film to form a folded portion And a step of attaching a closing member to the inner surface of the surface film, and a step of forming the seal portion to define the housing portion, and the front portion having the seal portion formed thereon. Among the surface film and the back surface film, at least the surface film is formed with an opening penetrating the surface film, and the closing member is formed of the surface film so as to at least partially overlap the opening. The closing member is attached to the inner surface, and the closing member includes a first surface facing the surface film, and a second surface opposite to the first surface, The first layer constituting one side is a method of manufacturing a bag, which is at least partially constituted by a material that can be heat welded to the inner surface of the surface film.

  The present invention is a bag in which a container is filled with a fluid, and comprises at least a front film and a back film, wherein the outer edge of the bag is an upper edge, a lower edge opposite to the upper edge, and the upper edge And a pair of side edges extending between the lower edge and the upper edge, the upper edge being formed by folding back a laminated film that constitutes at least a portion of the front film and at least a portion of the back film. At least partially includes the folded portion to be cut, and the front film and the back film are formed with an outlet portion through which the fluid flowing along the folded portion of the upper edge is taken out to the outside And the housing portion is a seal portion formed between the inner surface of the front film and the inner surface of the back film by heat welding along the lower edge and the pair of side edges of the bag. The surface film and the back film each include a base material layer and a thermoplastic resin layer provided on the base material layer and constituting the inner surface of the surface film, the surface Among the film and the back surface film, at least the front surface film is formed with an opening at a position inside the seal forming the housing, and at least the substrate in the opening. The layer is divided, the bag further comprising a closing member attached to the inner surface of the face film so as to at least partially overlap the opening, the closing member facing the face film And a second surface located opposite to the first surface, and heat-meltable between the first surface of the closing member and the inner surface of the surface film. A sealing portion is formed at least partially by the sealing portion, the opening portion being formed by the sealing portion between the first surface of the closing member and the inner surface of the surface film, or of the closing member. It is a bag enclosed by the combination of the said seal | sticker part between the said 1st surface and the said inner surface of the said surface film, the said inner surface of the said surface film, and the said inner surface of the said back film.

  The present invention relates to a method for producing a bag in which a container is filled with a fluid, and the step of preparing the bag according to the first aspect of the present invention as described above, and the container including the fluid through the opening. And a closing step of heat welding at least partially the first surface of the closing member and the inner surface of the surface film to form a seal portion, the closing step comprising the steps of: The opening may be formed by a seal formed by heat welding between the first surface of the closing member and the inner surface of the surface film, or the first surface and the surface of the closing member. A combination of a seal formed by heat welding between the inner surface of the film and a seal formed by heat welding between the inner surface of the front film and the inner surface of the back film , So as to be enclosed is carried out, a method of manufacturing a bag.

  The present invention relates to a method of manufacturing a bag in which a container is filled with a fluid, and a preparation step of preparing a bag having an opening formed therein, and filling the container with the fluid through the opening. A filling step, and a closing step closing the opening, wherein the receiving part is heat-welded along the lower edge and the pair of side edges of the bag between the inner surface of the front film and the inner surface of the back film And the step of preparing the laminated film including the thermoplastic resin layer constituting the inner surface and the base material layer; Forming at least a portion of the surface film and at least a portion of the back film integrally formed with at least a portion of the surface film through the folding portion; Surface fi And a step of attaching a closing member to the inner surface of the frame, and a step of forming the sealing portion to define the housing portion, and at least one of the front film and the back film on which the sealing portion is formed. The surface film is formed with an opening penetrating the surface film, and the closing member is attached to the inner surface of the surface film so as to at least partially overlap the opening, the closing The member includes a first surface facing the surface film, and a second surface opposite to the first surface, and a first layer constituting the first surface of the closing member is At least a portion of the opening is made of a material that can be heat-welded to the inner surface of the surface film, and in the closing step, the opening includes the first surface of the closing member and the surface fill. Seal formed by heat welding between the inner surface and the inner surface, or by heat welding between the first surface of the closing member and the inner surface of the surface film It is a manufacturing method of a bag implemented so that it may be surrounded by combination of a seal part formed by heat welding between a part and the above-mentioned inner surface of the above-mentioned surface film, and the above-mentioned inner surface of the above-mentioned back film.

  The present invention is a method of manufacturing a bag having a container filled with a fluid, wherein the container is formed by heat welding along the lower edge and the pair of side edges of the bag and the inner surface of the surface film. The method for manufacturing the bag includes the steps of preparing a laminated film including a thermoplastic resin layer constituting the inner surface and a base material layer, which is defined inside the seal portion formed between the inner surface of the back film and the inner surface of the back film. At least a portion of the back film integrally formed with at least a portion of the surface film and at least a portion of the surface film via the folded portion by folding the laminated film to form a folded portion And a step of forming the sealing portion to define the housing portion, and the surface film has a first portion adjacent to the other through the opening penetrating the surface film. The A contact state in which the first part and the second part are in partial contact with the inner surface of the first part and the inner surface of the second part, and the inner surface of the first part The bag is configured to be in an open state in which a gap is formed with the inner surface of the second portion.

  The present invention is a bag in which a container is filled with a fluid, and comprises at least a front film and a back film, wherein the outer edge of the bag is an upper edge, a lower edge opposite to the upper edge, and the upper edge And a pair of side edges extending between the lower edge and the upper edge, the upper edge being formed by folding back a laminated film that constitutes at least a portion of the front film and at least a portion of the back film. At least partially includes the folded portion to be cut, and the front film and the back film are formed with an outlet portion through which the fluid flowing along the folded portion of the upper edge is taken out to the outside The front surface film and the back surface film each include a base material layer, and a thermoplastic resin layer provided on the base material layer and constituting the inner surface of the front surface film. The surface film includes at least a first portion and a second portion adjacent to each other across an opening, and at least the base layer is divided in the opening, and the inner surface of the first portion and the second portion are separated. It is a bag in which a sealing seal is formed by heat welding between the inner surface of the part.

  The present invention relates to a method for producing a bag in which a container is filled with a fluid, and the step of preparing the bag according to the second aspect of the present invention as described above; A method of manufacturing a bag, comprising: a filling step of filling; and a closing step of thermally welding the inner surface of the first portion of the surface film and the inner surface of the second portion to form a sealing portion for closing. is there.

  The present invention relates to a method of manufacturing a bag in which a container is filled with a fluid, and a preparation step of preparing a bag having an opening formed therein, and filling the container with the fluid through the opening. A filling step, and a closing step closing the opening, wherein the receiving part is heat-welded along the lower edge and the pair of side edges of the bag between the inner surface of the front film and the inner surface of the back film And the step of preparing the laminated film including the thermoplastic resin layer constituting the inner surface and the base material layer; Forming at least a portion of the surface film and at least a portion of the back film integrally formed with at least a portion of the surface film through the folding portion; Seal part Forming the housing portion to define the housing portion, the surface film including at least a first portion and a second portion adjacent to each other across an opening penetrating the surface film, in the closing step It is a manufacturing method of the bag by which the sealing part for closures is formed by heat welding the above-mentioned inside of the 1st portion of the above-mentioned surface film, and the above-mentioned inside of the 2nd portion.

  In the first and second aspects of the present invention, the upper edge of the bag at least partially forms a folded portion formed by folding back the laminated film constituting at least a part of the front film and at least a part of the back film. Is included in For this reason, compared with the case where the upper edge of the bag is formed by the seal portion, the distance between the front film and the back film can be maintained wide. In addition, the front film and the back film are formed with an outlet port through which the fluid flowing along the folded portion of the upper edge is taken out to the outside. Therefore, according to the present invention, the flow path of the fluid at the upper edge of the bag can be widely secured. For this reason, when the bag is inclined, the fluid that has reached the upper edge of the bag from the storage portion can be smoothly guided toward the outlet. Also, by increasing the length of the upper edge of the bag constituted by the folded portion, a sufficient amount of fluid can be stored along the upper edge of the bag. For this reason, the removability of the fluid can be improved.

  In the first aspect of the present invention, at least the surface film of the bag is provided with an opening penetrating the surface film at least partially formed at a position inside the seal portion defining the housing portion. For this reason, the fluid can be filled in the storage portion of the bag through the opening formed in the surface film. A closing film is attached to the inner surface of the surface film so as to at least partially overlap the opening. For this reason, the opening formed in the surface film can be closed by heat-welding the closing film to the inner surface of the surface film after the container of the bag is filled with the fluid. Therefore, even when the upper edge of the bag includes the folded portion, the width of the opening at the time of filling can be secured wide. As a result, it is possible to provide a bag having a high flowability of the fluid and having an excellent fluid filling ability.

  In the second aspect of the present invention, the surface film includes at least a first portion and a second portion adjacent to each other across the opening penetrating the surface film. In addition, the first portion and the second portion of the surface film are in a contact state in which the inner surface of the first portion and the inner surface of the second portion partially contact, and the inner surface of the first portion and the inner surface of the second portion It is comprised so that the opening state which a clearance gap is formed between can be taken. For this reason, the fluid can be filled in the storage portion of the bag through the opening formed in the surface film. In addition, the opening can be closed by heat-sealing the inner surface of the first portion of the surface film and the inner surface of the second portion after the container of the bag is filled with the fluid. As a result, it is possible to provide a bag having a high flowability of the fluid and having an excellent fluid filling ability.

FIG. 1 is a perspective view showing a bag according to a first embodiment of the present invention. FIG. 2A is a front view of the bag shown in FIG. FIG. 2B is a cross-sectional view showing the bag shown in FIG. 2A taken along the line IIB-IIB. FIG. 3 is an exploded view of members constituting the bag shown in FIG. FIG. 4 is a cross-sectional view showing an example of the layer configuration of a front film, a back film and a lower film. FIG. 5 is a cross-sectional view showing an example of the layer configuration of the closing film. FIG. 6 is a cross-sectional view showing the bag shown in FIG. 2A as viewed along the line VI-VI. FIG. 7 is a cross-sectional view showing the bag shown in FIG. 2A as viewed along the line VII-VII. FIG. 8 is a perspective view showing a process of preparing a long laminated film, a lower film and a closing film for manufacturing a bag. FIG. 9A is a perspective view showing a step of turning back a long laminated film to form a folded portion to obtain a long front film and a back film. FIG. 9B is a cross-sectional view showing a case where each film shown in FIG. 9A is cut along a direction orthogonal to the transport direction of the film. FIG. 10 is a cross-sectional view showing a process of attaching a long closing film to a long surface film. FIG. 11 is a cross-sectional view showing a step of dividing an elongated surface film to obtain elongated first and second portions. FIG. 12 is a plan view showing a step of forming the containing portion by heat-welding the elongated front film and back film. FIG. 13 is a plan view showing a process of dividing the respective films heat-welded to each other along the shape of the outer edge of the bag. FIG. 14 is a cross-sectional view showing the closing film attached to the surface film so as to overlap the opening. FIG. 15A is a view showing a filling step of filling the fluid into the container through the opening. FIG. 15B shows a closing step of closing the opening using a closing film. FIG. 16 is a cross-sectional view showing the bag with the opening closed by the closing film. FIG. 17 is a cross-sectional view showing a modified example of the bag provided with the opening in the state of being closed by the closing film. FIG. 18A is a cross-sectional view of a variation of the bag with the opening prior to being closed by the closing film. FIG. 18B is a cross-sectional view showing a state in which the opening of the bag shown in FIG. 18A is closed by a closing film. FIG. 19A is a cross-sectional view of a variation of the bag with the opening prior to being closed by the closing film. FIG. 19B is a cross-sectional view showing a state in which the opening of the bag shown in FIG. 19A is closed by a closing film. FIG. 20 is a front view showing a modified example of the opening formed in the surface film of the bag. FIG. 21: is a front view which shows one modification of the opening part formed in the surface film of a bag. FIG. 22 is a front view showing a modified example of the opening formed in the surface film of the bag. FIG. 23: is a front view which shows one modification of the opening part formed in the surface film of a bag. FIG. 24 is a front view showing a modified example of the closing film attached to the inner surface of the surface film of the bag. 25A is an enlarged view of a portion surrounded by a frame XXV in FIG. 24. FIG. FIG. 25B shows the bag shown in FIG. 25A closed by the closing film. FIG. 26A is a front view showing a modified example of the closing film attached to the inner surface of the surface film of the bag. FIG. 26B is a view showing a state in which the opening of the bag shown in FIG. 26A is closed by a closing film. FIG. 27A is a front view showing a modified example of the closing film attached to the inner surface of the surface film of the bag. FIG. 27B shows the bag shown in FIG. 27A closed by the closing film. FIG. 28A is a front view showing a modified example of the opening formed in the surface film of the bag. FIG. 28B is a view showing a state in which the opening of the bag shown in FIG. 28A is closed by a closing film. FIG. 29A is a front view showing a modified example of the opening formed on the surface film of the bag and the closing film. FIG. 29B shows the bag shown in FIG. 29A closed by the closing film. FIG. 30A is a front view showing a modified example of the opening formed in the surface film of the bag and the closing film. FIG. 30B is a view showing an example of a state in which the opening of the bag shown in FIG. 30A is closed by a closing film. FIG. 30C is a view showing another example in which the opening of the bag shown in FIG. 30A is closed by the closing film. FIG. 31 is a perspective view showing an example in which a front film, a back film and a lower film are obtained from one laminated film. FIG. 32 is a perspective view showing an example in which a front film, a back film and a lower film are obtained from one laminated film. FIG. 33 is a perspective view showing a step of preparing a long laminate film, a lower film and a closing film in the first modified example of the method of manufacturing a bag. FIG. 34 is a cross-sectional view showing a folding step of obtaining a long surface film and a back film by folding a long laminate film and forming a folded part in a first modified example of the manufacturing method of the bag. FIG. 35 is a cross-sectional view showing a step of attaching a long closing film to a long surface film in the first modified example of the method of manufacturing a bag. FIG. 36 is a cross-sectional view showing a step of dividing an elongated surface film to obtain an elongated first portion and a second portion in the first modified example of the method of manufacturing a bag. FIG. 37 is a plan view showing a plurality of bags allocated to the respective elongated films in the first modified example of the method for manufacturing bags. FIG. 38 is a cross-sectional view showing a folding step of obtaining a long surface film and a back film by folding a long laminate film and forming a folded part in a second modified example of the manufacturing method of the bag. FIG. 39 is a cross-sectional view showing the step of attaching a long closing film to the long surface film in the second modified example of the bag manufacturing method. FIG. 40 is a cross-sectional view showing a step of dividing an elongated surface film to obtain an elongated first portion and a second portion in a second modified example of the method of manufacturing a bag. FIG. 41 is a plan view showing a plurality of bags allocated to elongated films in a second modified example of the bag manufacturing method. FIG. 42 is a cross-sectional view showing a folding step of obtaining a long surface film and a back film by folding a long laminate film and forming a folded part in a third modified example of the manufacturing method of the bag. FIG. 43 is a cross-sectional view showing the step of attaching a long closing film to the long surface film in the third modified example of the bag manufacturing method. FIG. 44 is a cross-sectional view showing a step of dividing an elongated surface film to obtain an elongated first portion and a second portion in a third modified example of the method of manufacturing a bag. FIG. 45 is a plan view showing a plurality of bags allocated to each long film in the third modified example of the method for manufacturing bags. FIG. 46 is a front view showing a bag according to a second embodiment of the present invention. 47A is a cross-sectional view showing the bag shown in FIG. 46 as viewed along the line XXXXVIIA-XXXXVIIA. 47B is a cross-sectional view showing the bag shown in FIG. 46 as viewed along the line XXXXVIIB-XXXXVIIB. FIG. 48 is a cross-sectional view showing a step of folding back the long laminated film to form a pair of folded parts in the manufacturing method of the bag shown in FIG. 46 to obtain a long surface film and a back film. FIG. 49 is a cross-sectional view showing a step of pressing one of the pair of folded portions inward to obtain an elongated lower surface film, in the method for producing the bag shown in FIG. 46. FIG. 50 shows the manufacturing method of the bag shown in FIG. 46 by removing the temporary seal between the inner surface of the first part of the surface film and the inner surface of the second part, to form the inner surface of the first part and the second part. Sectional drawing which shows the process of forming an opening part between inner surfaces. FIG. 51 is a view showing a filling step of filling the storage portion with the fluid through the opening of the bag shown in FIG. 46; FIG. 52 is a cross-sectional view showing the bag in a state where a closing seal is formed between the inner surface of the first portion and the inner surface of the second portion. FIG. 53 is a front view showing the bag in a state in which a closing seal is formed between the inner surface of the first portion and the inner surface of the second portion. FIG. 54 is an exploded view showing a modified example of members constituting the bag. FIG. 55 is a view showing an example of a cross section of a bag made of each member shown in FIG. 54. FIG. 56 is a view showing an example of a cross section of a bag made of each member shown in FIG. 54. FIG. 57 is a front view of the bag with an opening extending parallel to the lower edge. FIG. 58 is a front view showing a bag with an opening extending in parallel with the lower edge and the upper edge.

First Embodiment A first embodiment of the present invention (hereinafter, also referred to as a first embodiment) will be described below with reference to FIGS. In the drawings attached to the present specification, for the sake of easiness of illustration and understanding, the scale, vertical and horizontal dimensional ratio, etc. may be exaggerated as appropriate from those of a real thing.

Sack FIG. 1 is a perspective view showing the entire bag 1 according to the first embodiment, and FIG. 2A is a front view showing the entire bag 1 according to the first embodiment. In FIG. 1 and FIG. 2A, the bag 1 in the state before being filled with the fluid is shown.

  In the first embodiment, an example in which the bag 1 is of a self-supporting type will be described. For example, in the lower part of the bag 1 shown in FIG. 1, a predetermined interval also called a gusset M is provided between a front film 11 and a rear film 12 described later. That is, the bag 1 is a so-called bottom gusset bag in which a gusset is formed at the lower edge 23 thereof. In this specification, the terms "lower", "lower edge", "upper", "upper edge", "side", "side edge", and the terms "vertical direction" and "horizontal direction" The position and the direction of the bag 1 or its components are represented on the basis of the state in which the bag 1 is in a self-standing state. In addition, in FIG. 2A, the front view of the bag 1 of the state by which the lower surface film 13 inserted between the surface film 11 and the back film 12 in order to form the gusset M was folded is shown.

  The bag 1 comprises at least a front film 11 and a back film 12. A seal is formed between the inner surface of the front film 11 and the inner surface of the back film 12 by heat welding along a part of the outer edge of the bag 1. In the first embodiment, the outer edge of the bag 1 is defined by the outer edge of the top film 11 and the outer edge of the back film 12. Therefore, in the first embodiment, the outer edge of the bag 1 coincides with the outer edge of the top film 11 and the outer edge of the back film 12. In the following description, the outer edge of the bag 1 may be referred to as the outer edge of the top film 11 or the outer edge of the back film 12. In the first embodiment, the surface film 11 means a film located on the surface side of the bag 1 among the laminated films constituting the bag 1. Similarly, the back film 12 means a film located on the back side of the bag 1 among the laminated films constituting the bag 1. Thus, the terms "front film" and "back film" are defined based on the position of the bag 1, and are defined in accordance with the form of a member such as a laminated film constituting the front film or the back film. It is not something to be done.

  As shown in FIGS. 1 and 2A, the outer edge of the bag 1 has an upper edge 21, a lower edge 23 opposite the upper edge 21, and a pair of side edges 22 extending between the upper edge 21 and the lower edge 23. Contains. The above-mentioned seal portion includes a lower edge seal portion 23 a formed along the lower edge 23 and a pair of side edge seal portions 22 a formed along the pair of side edges 22. The accommodating part S in which the fluid is accommodated is defined inside the seal parts 22a and 23a. As will be described in detail later, in the first embodiment, the upper edge 21 is constituted by a folded portion 10c formed by folding back the laminated film.

  In addition, the width of the sealing portion and the specific pattern shape are particularly limited as long as the housing portion S can be prevented from communicating with the outside of the bag 1 via the outer edge of the front surface film 11 and the outer edge of the back surface film 12. I can not. For example, the width of the seal may vary with position. Also, the direction in which the seal portion extends and the direction in which the outer edge of the surface film 11 and the outer edge of the back film 12 extend may be at least partially non-parallel. For example, as shown in FIG. 1 and FIG. 2A, a notch 37 may be formed in the side edge seal 22a to form an outlet 50 described later.

  Moreover, the seal part which defines the containing part S filled with the fluid may be a seal part formed by heat welding the inner surface of the front film 11 and the inner surface of the back film 12, or It may be a seal part which bonds surface film 11 and back film 12 by heat welding other films inserted between film 11 and back film 12 to surface film 11 and back film 12. That is, the “seal portion formed between the inner surface of the front film 11 and the inner surface of the back film 12” is only the seal portion formed by heat welding the inner surface of the front film 11 and the inner surface of the back film 12 It is a concept including not only the film inserted between the inner surface of front film 11 and the inner surface of back film 12, and the seal part formed by heat-sealing front film 11 and back film 12.

  As shown in FIGS. 1 and 2A, at the position where the upper edge 21 and one side edge 22 of the front film 11 and the back film 12 intersect, the fluid stored in the storage portion S is outside the bag 1. An outlet 50 is formed to pass through when being taken out. The outlet portion 50 is a portion provided to adjust the flow of the fluid when the fluid is taken out of the bag 1. The opening portion 35 is formed with an opening scheduled portion 35 serving as an outlet for taking out the fluid by being opened. The width w of the opening scheduled portion 35 is a pair of side edge seal portions 22 a of the bag 1. It is smaller than the interval between In the following description, the side edge 22 of the pair of side edges 22 on the side where the outlet portion 50 is formed is referred to as one side edge 22 and the side edge 22 opposed to the one side edge 22. May be referred to as the other side edge 22. Similarly, the side edge seal portion 22a formed on one side edge 22 is referred to as one side edge seal portion 22a, and the side edge seal portion 22a formed on the other side edge 22 is referred to as the other side edge seal portion 22a. May be referred to as a side edge seal 22a.

  The specific shape of the outlet portion 50 is not particularly limited as long as the width w of the portion 35 to be opened of the outlet portion 50 is smaller than the distance between the pair of side edge seal portions 22a. For example, as shown in FIGS. 1 and 2A, the side edge seal portion 22a of one side edge 22 may be formed with a notch 37 for adjusting the shape and the width w of the outlet port portion 50. For example, the notch 37 is configured such that the distance between the upper edge 21 and the one side edge seal 22a narrows toward the position where the upper edge 21 and the one side edge 22 meet. A region including one side edge seal portion 22a in contact with the notch 37 configured in this way and a portion of the upper edge 21 formed of the folded back portion 10c that faces the one side edge seal portion 22a It functions as the unit 50. In the following description, the direction along the upper edge 21 to the position where the upper edge 21 and the one side edge 22 meet is also referred to as the fluid removal direction. Further, in the following description, a portion of the one side edge seal portion 22a that constitutes the outlet portion 50 is also referred to as an outlet seal portion 36.

  The planned opening 35 of the outlet 50 extends from the outlet seal 36 toward the upper edge 21 so as to cross the direction of removal of the fluid. By breaking the bag 1 along the portion 35 to be opened, an outlet for taking out the fluid is formed in the outlet 50. From the outlet, for example, when the bag 1 is inclined, it flows along the folded portion 10c of the upper edge 21 to reach the outlet 50, and passes through a channel of width w defined by the outlet 50. The fluid rectified by this can be taken out to the outside.

  The opening planned portion 35 may be provided with an easy opening means for making the opening planned portion 35 easy to be opened. For example, a half cut line formed by laser processing, a cutter or the like may be provided as an easy opening means. In addition, a stretched film may be included in the front film 11 or the back film 12, and the stretching direction of the stretched film may be matched with the breaking direction of the bag 1. Further, the bag 1 may be printed to show the user of the bag 1 the position to be opened. Further, a notch 38 serving as a starting point for breaking the bag 1 may be formed in a portion overlapping the opening scheduled portion 35 in the outlet sealing portion 36. Although not shown, in place of or in addition to the notches 38, incisions or scars may be formed on the surface film 11 and / or the back film 12 constituting the outlet seal portion 36. The scars may include, for example, a plurality of through holes formed to penetrate the surface film 11 and / or the back film 12. Alternatively, it may include a plurality of holes formed in the outer surfaces 11 y and 12 y of the front film 11 and / or the back film 12 so as not to penetrate the front film 11 and / or the back film 12. For example, the holes of the scar group may penetrate only the later-described base layer 52 of the surface film 11 and / or the back film 12, and may not penetrate the thermoplastic resin layer 51.

  The fluid filled in the bag 1 is not particularly limited as long as it can pass through the outlet 50 and the opening 15 described later. For example, as the fluid filled in the bag 1, a fluid having fluidity, such as a liquid such as liquid detergent or shampoo, powder or granules, can be mentioned. These fluids may be removed from the bag 1 via the outlet 50 and injected into the bottle. That is, the bag 1 may be a refill bag for refilling the fluid into a bottle having a higher rigidity than the bag 1.

  Preferably, the distance from the lower edge 23 to the upper edge 21 is at least partially reduced from one side edge 22 to the other side edge 22 of the pair of side edges 22. For example, the distance H2 from the lower edge 23 to the upper edge 21 at the position of the other side edge 22 is smaller than the distance H1 from the lower edge 23 to the upper edge 21 at the position of one side edge 22. Thereby, as described later, the fluid can be more smoothly introduced from the storage portion S toward the outlet 50, and therefore, the removability of the fluid can be improved.

  Next, the components of the bag 1 will be described. FIG. 3 is an exploded view of members constituting the bag 1. As shown in FIG. 3, in the first embodiment, the bag 1 includes the front film 11, the back film 12, the lower film 13 inserted between the front film 11 and the back film 12, and the front film 11. It is constituted by a closing film 40 attached to the inner surface. Among them, the surface film 11 includes a first portion 11 a located on the upper side of the bag 1 and a second portion 11 b located on the lower side of the bag 1. In the first embodiment, by forming the surface film 11 by combining the first portion 11a and the second portion 11b separated from each other, the opening 15 described later is formed.

  In the first embodiment, the upper edge 21 of the bag 1 is a folded portion formed by folding back one laminated film constituting at least a part of the front film 11 and at least a part of the back film 12. At least partially. In the example shown in FIG. 3, the upper edge 21 of the bag 1 is constituted by a folded portion 10 c formed by folding back a single laminated film 10 constituting the first portion 11 a of the surface film 11 and the back film 12. It is done. Further, as shown in FIGS. 1 and 2A, the above-described outlet 50 is disposed so as to pass through the outlet 50 when the fluid flowing along the folded portion 10c of the upper edge 21 is taken out to the outside. ing. The advantages of configuring the upper edge 21 and the outlet 50 as described above will be described later.

  Although FIG. 3 shows an example in which the entire area of the upper edge 21 is formed by the folded portion 10 c, the present invention is not limited to this, and a portion of the upper edge 21 reaching the outlet 50 described later is What is necessary is just to be comprised by the return part 10c at least.

  As shown in FIG. 3, between the front film 11 and the back film 12 in a state in which the lower surface film 13 is folded back so as to be convex toward the inner side (the side of the storage portion S) of the bag 1. Be inserted. The gusset M described above can be formed on the lower part of the bag 1 by forming the lower part of the bag 1 using the lower surface film 13 folded back in this way.

  In FIG. 3, reference numerals 10x, 11x, 12x and 13x denote the inner surfaces of the laminated film 10, the front film 11, the back film 12 and the lower film 13, respectively. Further, reference numerals 10y, 11y, 12y and 13y denote the outer surfaces of the laminated film 10, the front film 11, the back film 12 and the lower film 13, respectively. In addition, in this specification, an "inner surface" is a surface on the side facing the accommodating part S with which a fluid is filled, and an "outer surface" is a surface located in the opposite side of an inner surface. Further, the closing film 40 includes a first surface 40 x facing the surface film 11 and a second surface 40 y located on the opposite side of the first surface 40 x.

  Next, with reference to FIGS. 2A and 2B, the structure of the bag 1 configured by using the films 11, 12, 13, 40 described above will be described in detail. FIG. 2B is a cross-sectional view showing the bag 1 shown in FIG. 2A as viewed along the IIB-IIB line.

(Aperture)
In the first embodiment, at least the surface film 11 of the surface film 11 and the back film 12, the opening 15 penetrating the surface film 11 is more inward than the seal portions 22a and 23a defining the housing portion S. At least partially formed in the position of. In the bag 1 in a state before the container S is filled with the fluid, the “opening 15” is formed of all layers such as the thermoplastic resin layer 51 and the base material layer 52 described later that constitute the surface film 11. It is defined as a divided part. On the other hand, in the bag 1 in a state where the sealing portion is formed so as to close the opening 15 after the storage portion S is filled with the fluid, the “opening 15” is one of the layers constituting the surface film 11 At least the base layer 52 is defined as a part where it is divided.

  In FIG. 2A and FIG. 2B, the end of the first portion 11a facing the opening 15 is represented by reference numeral 11ae, and the end of the second portion 11b facing the opening 15 is represented by reference 11be. The positional relationship between the end 11ae and the end 11be is not particularly limited as long as the layers constituting the surface film 11 are separated from each other. For example, as shown in FIG. 2B, the end 11ae and the end 11be may be in contact with each other. Further, as described later, the end 11ae and the end 11be may be separated from each other.

  The opening 15 is a portion through which the fluid passes when the container S is filled with the fluid, as described later. The dimensions of the opening 15 at the inside of the seals 22a, 23a are preferably set wider so that the filling of the fluid can be performed efficiently. For example, as shown in FIG. 2A, the opening 15 may extend from one side edge seal 22a to the other side edge seal 22a. The opening 15 may extend not only to the inside of the seal portions 22a and 23a but also to the inside of the seal portions 22a and 23a. In FIG. 2A, an example is shown in which the opening 15 extends from one side edge 22 to the other side edge 22 of the bag 1.

  Further, as long as the accommodation portion S can be filled with the fluid through the opening 15, the direction in which the opening 15 extends is not particularly limited. For example, the opening 15 may extend from the upper edge 21 toward the lower edge seal 23 a. Also in this case, by providing the closing film 40 so as to overlap the opening 15, the fluid filling step and the closing step after the filling step can be easily performed. In the first embodiment, in consideration of the manufacturing efficiency of the bag 1, an example in which the upper edge 21 and the opening 15 extend substantially in parallel to each other will be described. Note that “substantially parallel” means, for example, a straight line connecting an end of the opening 15 on one side edge 22 and an end of the opening 15 on the other side edge 22, and a folded portion of the upper edge 21 It means that the angle formed by 10c is in the range of -5 to +5 degrees.

  Although not shown, the opening 15 may be formed not only on the front film 11 but also on the back film 12. For example, in the case where the storage portion S is divided into the first storage portion on the front surface film 11 side and the second storage portion on the back surface film 12 inside the bag 1, the openings 15 are respectively formed in the front surface film 11 and the back surface film 12. As a result, it is possible to fill the first container and the second container with the fluid through the openings 15, respectively.

  In addition, the front film 11 and the back film 12 are not specifically distinguished by the printing indication given. Therefore, the statement "the opening 15 is formed in at least the surface film 11" does not limit the formation of the opening 15 in any one specific film of the surface film 11 or the back film 12. . In other words, the opening 15 described above may be formed in any of the pair of front and back films constituting the bag 1.

(Film for closing)
The closing film 40 is a member provided to close the opening 15 after filling the fluid into the container S using the opening 15. The closing film 40 is attached to the inner surface 11 x of the face film 11 so as to at least partially overlap the opening 15. In FIGS. 2A and 2B, an example in which the closing film 40 attached to the inner surface 11x of the surface film 11 is configured to overlap the entire area of the opening 15 is shown. In FIGS. 2A and 2B, a mounting seal portion formed by heat-welding the closing film 40 to the inner surface 11x of the first portion 11a of the surface film 11 is indicated by the reference numeral 41. The mounting seal portion 41 is formed to extend from one side edge seal portion 22a to the other side edge seal portion 22a. Also, in FIG. 2A, an example is shown in which the closing film 40 extends from one side edge 22 of the bag 1 to the other side edge 22.

  As long as the closing film 40 can be fixed to the inner surface 11x of the surface film 11 in the bag 1 in a state before the container S is filled with the fluid, the closing film 40 is the inner surface 11x of the surface film 11. The method of attaching to is not limited to heat welding. Also, as long as the closing film 40 can at least partially overlap the opening 15 after the container S is filled with the fluid, in the bag 1 in the state before the container S is filled with the fluid. The closing film 40 does not necessarily have to overlap the opening 15. For example, in the bag 1 in a state before the container S is filled with the fluid, the closing film 40 is folded so that the closing film 40 may not overlap the opening 15. In this case, when closing the opening 15 after the container S is filled with the fluid, the closing film 40 is overlapped with the opening 15 by spreading the folded closing film 40.

(Seal part)
Next, the side edge seal portion 22a, the lower edge seal portion 23a and the mounting seal portion 41 described above will be described in detail. The side edge seal portion 22 a is a seal portion formed by thermally welding the inner surface 11 x of the front surface film 11 and the inner surface 12 x of the rear surface film 12. On the other hand, the lower edge seal portion 23a is formed by thermally welding the inner surface 11x of the front surface film 11 and the inner surface 13x of the lower surface film 13 and heat welding the inner surface 12x of the back surface film 12 and the inner surface 13x of the lower surface film 13 Seal part. The mounting seal portion 41 is a seal portion formed by heat-welding the inner surface 11 x of the surface film 11 and the first surface 40 x of the closing film 40.

  In this specification, for convenience of explanation, a seal portion obtained by heat-welding the inner surface 11x of the surface film 11, such as the side edge seal portion 22a, and the inner surface 12x of the back film 12, It may be called part R1. Further, a seal portion obtained by heat-welding the inner surface 11x of the front film 11 or the inner surface 12x of the rear film 12 and the inner surface 13x of the lower film 13 such as the lower edge seal portion 23a It may be called R2. In addition, a seal portion obtained by heat-welding the inner surface 11x of the surface film 11 and the first surface 40x of the closing film 40, such as the mounting seal portion 41, is referred to as a third type seal portion R3. There is also. Further, as shown in FIG. 9 described later, the seal portion obtained by heat-welding the inner surface 12 x of the back surface film 12 and the second surface 40 y of the closing film 40 is referred to as a fourth type seal portion R4. There is also. Also, different types of seals may be hatched differently.

  By the way, as shown in FIG. 2A, when the closing film 40 extends from one side edge 22 to the other side edge 22 of the bag 1, the pair of side edges 22 includes the inner surface 11x of the front film 11 and the back film. There will be portions where the 12 inner surfaces 12x are not in direct contact with each other. In such a portion, as shown in FIG. 2A, a third type seal portion R3 is formed by heat-welding the inner surface 11x of the surface film 11 and the first surface 40x of the closing film 40, which will be described later. As shown in FIG. 14, the fourth type seal portion R4 is formed by heat welding the inner surface 12x of the back surface film 12 and the second surface 40y of the closing film 40, whereby the inner surface 11x of the surface film 11 and The space between the back film 12 and the inner surface 12 x may be sealed. In this case, the side edge seal portion 22a is not only the first type seal portion R1 formed by heat welding the inner surface 11x of the front surface film 11 and the inner surface 12x of the back surface film 12, but also the third type seal portion R3 or the like. It also includes the fourth type seal portion R4.

  In the same manner as in the case where the closing film 40 is inserted between the front film 11 and the back film 12, the lower film 13 is inserted between the front film 11 and the back film 12. Also, the inner surface 11x of the surface film 11 and the inner surface 12x of the back film 12 do not come in direct contact with each other. Taking this point into consideration, as shown in FIG. 2A, a notch 13 d may be formed in a portion of the lower surface film 13 along the side edge 22. In this case, the inner surface 11x of the surface film 11 and the inner surface 12x of the back surface film 12 can be partially heat-welded via the notch 13d to form the first type sealed portion R1. In FIG. 2, two notches 13 d along the direction in which the side edge 22 extends on the side of the side edge (one side edge) 22 on the side where the outlet portion 50 is formed among the pair of side edges 22. An example is shown in which one notch 13d is formed on the other side edge 22 side.

  Next, the cross-sectional structure of the upper edge 21 including the folded portion 10c will be described. First, the cross-sectional structure of the upper edge 21 located at a position away from the outlet 50 in the upper edge 21 will be described. FIG. 6 shows a cross section taken along line VI-VI of FIG. 2A. As shown in FIG. 6, the folded portion 10c of the upper edge 21 has an arc-like cross-sectional shape that is curved with a curvature radius r1.

  Next, the cross-sectional structure of the portion of the upper edge 21 where the outlet portion 50 is formed will be described. FIG. 7 is a cross section taken along the line VII-VII in FIG. 2A, and shows the cross sectional shape of the portion 35 to be opened. As shown in FIG. 7, in the portion 35 to be opened, a substantially elliptical cross-sectional shape as a whole is formed by heat welding the inner surface 11 x of the first portion 11 a of the front surface film 11 and the inner surface 12 x of the rear surface film 12. It is done. The folded portion 10c of the upper edge 21 has an arc-like cross-sectional shape.

(the film)
Next, an example of the layer configuration of the front film 11, the back film 12, the lower film 13, and the closing film 40 will be described. First, the layer configuration of the laminated film 10, the front film 11, the back film 12, and the lower film 13 will be described with reference to FIG. As shown in FIG. 4, the laminated film 10, the front film 11, the back film 12 and the lower film 13 include a base material layer 52 and a thermoplastic resin layer 51 provided on the base material layer 52. . In the example shown in FIG. 4, the base material layer 52 constitutes the outer surfaces 10 y, 11 y, 12 y and 13 y of the respective films 10, 11, 12 and 13, and the thermoplastic resin layer 51 comprises the respective films 10 and 11. , 12, 13 of the inner surface 10x, 11x, 12x, 13x. The base layer 52 may be printed and displayed with characters, numbers, symbols, figures, patterns, and the like for indicating product information.

As a material which comprises the base material layer 52, a polyethylene terephthalate and nylon can be used, for example. The base layer 52 can ensure high printability on the outer surfaces 10 y, 11 y, 12 y, 13 y. Moreover, the base material layer 52 has high heat resistance at the time of heat welding.
As a material which comprises the thermoplastic resin layer 51, polyethylene, a polypropylene, etc. can be used, for example.
The thickness of the films 10, 11, 12, 13 is, for example, in the range of 20 to 250 μm.

  Although not shown, the films 10, 11, 12 and 13 may further include an intermediate layer disposed between the base layer 52 and the thermoplastic resin layer 51. An appropriate intermediate layer may be selected according to the required performance such as water vapor and other gas barrier properties, light shielding properties, various mechanical strengths and the like. For example, as the intermediate layer, a metal layer, a deposited layer of metal or metal oxide, or the like may be provided. In addition, as the intermediate layer, a resin layer having gas barrier properties such as ethylene-vinyl alcohol copolymer (EVOH), polyvinylidene chloride resin (PVDC), or aromatic polyamide such as nylon MXD 6 may be provided. By providing such an intermediate layer, it is possible to suppress oxygen and water vapor from invading the inside of the bag 1. In addition, a stretched nylon film may be provided as an intermediate layer. In this case, the puncture resistance of the bag 1 can be enhanced.

  Next, with reference to FIG. 5, the layer configuration of the closing film 40 will be described. As shown in FIG. 5, the closing film 40 includes a first layer 56 constituting the first surface 40 x of the closing film 40 and a second layer 57 constituting the second surface 40 y of the closing film 40. It contains.

The first layer 56 is a layer that is thermally welded to the thermoplastic resin layer 51 of the surface film 11 to form the mounting seal portion 41 and the closing seal portion 42 described later. Thus, the first layer 56 of the closing film 40 is at least partially made of a material that can be heat welded to the inner surface 11 x of the face film 11. On the other hand, when the first layer 56 of the closing film 40 is thermally welded to the thermoplastic resin layer 51 of the surface film 11 in order to close the opening 15, the second layer 57 is also melted together with the first layer 56 In addition, it is conceivable that the second layer 57 of the closing film 40 is thermally welded to the inner surface 12 x of the back film 12 in the region of the housing portion S. Taking this point into consideration, the second layer 57 constituting the second surface 40y of the closing film 40 is made of a material having a melting point higher than that of the material constituting the first layer 56 of the closing film 40. Good. For example, as a combination of a material forming the first layer 56 and a material forming the second layer 57, combinations shown in Examples 1 to 3 of Table 1 below can be adopted.

  In addition, in order to prevent the second layer 57 of the closing film 40 from being heat-welded to the inner surface 12 x of the back film 12 in the region of the storage portion S, the second film 57 is not shown. The second surface 40 y of the closing film 40 and the back film 12 are in a portion of the surface 40 y located in the housing portion S and in a portion of the inner surface 12 x of the back film 12 overlapping the closing film 40 in the housing portion S. An inhibitor may be provided that inhibits heat adhesion from occurring with the inner surface 12x of As the inhibitor, for example, an ink containing a silicone resin and a cellulose resin as main components and containing ethyl acetate as a solvent (for example, DIC Corporation, Polycoat P-91, solid content 10%) can be used.

Although FIG. 5 shows an example in which the first surface 40x of the closing film 40 is constituted by the first layer 56 over the entire area, the present invention is not limited to this. The portion of the first surface 40x of the closing film 40 to be heat-welded to the inner surface 11x of the surface film 11 may be constituted by at least the first layer 56, and the other portions of the first surface 40x are not shown. May be constituted by the second layer 57 or other layers.
Although FIG. 5 shows an example in which the second surface 40y of the closing film 40 is constituted by the second layer 57 over the entire area, the present invention is not limited to this. Of the second surface 40y of the closing film 40, at least a portion facing the portion of the first surface 40x to be heat-welded to the inner surface 11x of the surface film 11 may be constituted by at least the second layer 57. The other portion of the surface 40y may be constituted by the first layer 56 or other layers, which is not shown.

  As in the case of the front film 11, the back film 12 and the lower film 13, an intermediate layer may be disposed between the first layer 56 and the second layer 57 of the closing film 40. The thickness of the closing film 40 is, for example, in the range of 20 to 250 μm. As the intermediate layer, for example, as in the case of the surface film 11, the back film 12 and the lower film 13, an aromatic polyamide such as ethylene-vinyl alcohol copolymer (EVOH), polyvinylidene chloride resin (PVDC) or nylon MXD6 A resin layer having high gas barrier properties, such as, can be used.

  Needless to say, the layer configurations of the front film 11, the back film 12, the lower film 13 and the closing film 40 are not limited to those described above.

(Method of manufacturing bag)
Next, a method of manufacturing the bag 1 according to the first embodiment will be described.

[Step of Producing Laminated Film (First Step)]
First, an example of the process of producing the raw fabric of the laminated film 10 for the surface film 11 and the back film 12 is demonstrated. First, a raw fabric of one base layer 52 is prepared. Here, the raw material means a rolled film. Next, you may print-display on one side of the film of the elongate base material layer 52 unwound from one raw fabric. For example, the printing indication for the surface film 11 is repeatedly applied to one side of the film of the elongated base layer 52, and the other side of the film of the elongated base layer 52 is repeatedly applied. The printing display for the back film 12 may be repeatedly applied. Next, the thermoplastic resin layer 51 is laminated on the film of the long base material layer 52 using the dry lamination method or the melt extrusion laminating method, and the long laminated film 10 is produced. Thus, a raw film of the laminated film 10 for the front film 11 and the back film 12 is obtained. In addition, you may make it apply to the laminated | multilayer film 10, without giving a printing display in the state of the film of a base material layer.

  Hereinafter, the method to manufacture the bag 1 using the raw fabric of the laminated film 10 obtained as mentioned above is demonstrated.

[Step of preparing film (second step)]
First, a raw fabric of the above-mentioned laminated film 10 is prepared. In the manufacturing apparatus in which the raw fabric of the laminated film 10 is prepared, the raw fabric of the lower surface film 13 or the raw fabric of the closing film 40 may be prepared. Next, as shown in FIG. 8, the laminated film 10 is unrolled from the raw fabric. Moreover, as shown in FIG. 8, the elongate lower surface film 13 and the film 40 for closure are prepared so that it may overlap with the elongate laminated film 10 unwound from the raw fabric. In FIG. 8, the transport direction of each of the long films unwound from the raw fabric is represented by a symbol T.

  As shown in FIG. 8, a plurality of through holes 13 e may be formed in the lower surface film 13. The through hole 13 e is to be the notch 13 d of the bag 1 later.

[Folding step (third step)]
Next, as shown to FIG. 9A, the folding process which folds the elongate laminated film 10 and forms the folding part 10c is implemented. Further, the elongated lower film 13 is folded back to form a folded portion 13c. By folding back the long laminated film 10, it is configured integrally with the surface film 11 via the long surface film 11 and the folded portion 10c, which will later constitute the surface film 11 of the bag 1. In addition, a long back film 12 can be obtained. FIG. 9B is a cross-sectional view showing a case where each film shown in FIG. 9A is cut along a direction orthogonal to the transport direction T of the film. The folding of the lower film 13 is performed such that the corresponding pair of through holes 13 e overlap each other.

[Mounting process (fourth process)]
Next, a mounting process of mounting the closing film 40 on the inner surface 11x of the surface film 11 is performed. First, the surface film 11 and the closing film 40 are disposed so that the long surface film 11 overlaps the long closing film 40. After that, as shown in FIG. 10, the mounting seal portion 41 is formed by partially thermally welding the first surface 40x of the closing film 40 to the inner surface 11x of the surface film 11. Preferably, the heating temperatures of the surface film 11 and the closing film 40 when forming the mounting seal portion 41 are determined by using the material forming the thermoplastic resin layer 51 of the surface film 11 and the first layer 56 of the closing film 40. The temperature is controlled to be higher than the melting point of the constituent material but lower than the melting point of the material constituting the second layer 57 of the closing film 40. This can prevent the second layer 57 of the closing film 40 from melting during heat welding.

  As long as the closing film 40 can be attached to the inner surface 11x of the surface film 11, the width and the specific pattern shape of the attaching seal portion 41 are not particularly limited. For example, the mounting seal portion 41 may include a plurality of seal portions disposed intermittently. Further, the width of the mounting seal portion 41 may be changed depending on the position. Also, the direction in which the mounting seal portion 41 extends and the direction in which the closing film 40 and the opening 15 extend may be at least partially non-parallel.

[Lower edge seal forming process (fifth process)]
Further, as shown in FIG. 10, the lower edge seal portion forming step of thermally welding the inner surface 13x of the lower surface film 13 to the inner surface 11x of the front surface film 11 and the inner surface 12x of the back surface film 12 to form the lower edge seal portion 23a carry out. The lower edge seal forming process may be performed simultaneously with the above-described attaching process of attaching the closing film 40 to the surface film 11.

[Aperture Forming Step (Sixth Step)]
Next, using a cutter blade or the like provided so as to extend along the transport direction T of the elongated surface film 11, the elongated surface film 11 is continuously transported to two of the surface film 11 while being transported. Cut into portions, thereby obtaining the elongated first portion 11a and the second portion 11b, and forming the opening 15 between the end 11ae of the first portion 11a and the end 11be of the second portion 11b To carry out the opening formation process. As shown in FIG. 11, the opening forming step is performed such that the above-mentioned mounting seal portion 41 is located on the first portion 11 a side and the closing film 40 at least partially overlaps the opening 15. .

As a cutter blade for cutting the long surface film 11, one cutter blade may be used, or a predetermined distance may be provided in a direction orthogonal to the conveyance direction of the long surface film 11. Two cutter blades may be used. When cutting the surface film 11 using a single cutter blade, as shown in FIG. 2B described above, the end 11ae of the first portion 11a and the end 11be of the second portion 11b contact each other or are extremely close to each other You will come to On the other hand, when the surface film 11 is cut using two cutter blades, a predetermined gap is present between the end 11 ae of the first portion 11 a and the end 11 be of the second portion 11 b.
The first surface 11 a and the second portion 11 b are cut by cutting the long surface film 11 into two parts using a cutter blade provided so as to extend along the conveyance direction of the long surface film 11. If so, the opening 15 will extend parallel to the folded portion 10c of the upper edge 21 from one side edge seal 22a to the other side edge seal 22a. In addition, when the first portion 11a and the second portion 11b are thus obtained, the opening 15 can be continuously formed while conveying the elongated surface film 11, so that the manufacturing suitability is excellent. There is.

[Side Edge Sealed Part Forming Step (Seventh Step)]
Next, along the side edge 22 of the top film 11 and the side edge 22 of the back film 12 by thermal welding, at least partially between the inner surface 11 x of the top film 11 and the inner surface 12 x of the back film 12 The side edge seal forming process is performed to form the side edge seal 22a. As a result, the housing portion S is defined inside the side edge seal portion 22a and the lower edge seal portion 23a. When the closing film 40 extends from one side edge 22 to the other side edge 22 of the bag 1, the inner surface 11x of the surface film 11 and the closing film 40 are closed at the position where the closing film 40 and the side edge seal portion 22a overlap. The third type seal portion R3 is formed by heat welding with the first surface 40x of the film 40, and the fourth surface is obtained by heat welding the inner surface 12x of the back film 12 and the second surface 40y of the closing film 40. You may form seed seal | sticker part R4. FIG. 12 is a plan view showing each film in a state in which the side edge seal portion 22a is formed by heat welding the long surface film 11 and the back film 12, as viewed from the surface film 11 side. .

[Parting step (eighth step)]
Next, as shown in FIG. 13, a dividing step of dividing the long films 11, 12, 13, 40 heat welded to each other along the shape of the outer edge of the bag 1 is performed. Thereby, the bag 1 in which the storage portion S is defined inside the side edge seal portion 22a and the lower edge seal portion 23a can be obtained. The dividing step is performed to divide the through holes 13 e formed in the lower surface film 13 into two parts. Thereby, as shown in FIG. 13, the notches 13 d can be formed in each bag 1. Further, the first type sealed portion R1 can be formed by partially thermally welding the inner surface 11x of the surface film 11 and the inner surface 12x of the back surface film 12 through the notches 13d.

  As shown in FIG. 13, in the first embodiment, a folded portion 10 c formed by folding back the long laminated film 10 constitutes the upper edge 21 of the bag 1. The opening 15 is formed by cutting the elongated surface film 11 using a cutter blade or the like provided so as to extend along the transport direction T. For this reason, as shown in FIG. 13, the opening 15 is formed in the surface film 11 so as to extend from one side edge 22 to the other side edge 22 of the pair of side edges 22 of the bag 1. Also, the upper edge 21 extends substantially parallel to the opening 15.

  As shown in FIG. 13, the upper edge 21 of the bag 1, the opening 15 and the closing film 40 all extend in parallel to the transport direction T of the elongated films. Therefore, according to the first embodiment, the upper edge 21 including the folded portion 10c, the opening 15 passing through the surface film 11, and the closure attached to the inner surface 11x of the surface film 11 so as to overlap the opening 15. The bag 1 provided with the film 40 can be efficiently manufactured using each long film.

  In the first embodiment, the upper edge 21 is configured to be inclined at a predetermined angle with respect to the lower edge 23, as shown in FIG. 2A described above. For this reason, as shown in FIG. 13, in the dividing step of dividing each long film along the shape of the outer edge of the bag 1, each film along a direction inclined at a predetermined angle with respect to the transport direction T The lower edge 23 of the bag 1 is obtained.

  In addition, the above-mentioned "film preparing process (second process)", "folding process (third process)", "mounting process (fourth process)", "lower edge seal portion forming process (fifth process)", " The opening forming step (sixth step), the "side edge seal portion forming step (seventh step)" and the "dividing step (the eighth step)" may be performed inline. That is, the second to eighth steps may be carried out continuously without winding each film halfway.

  In addition, the order in which the above-described second to eighth steps are performed is not particularly limited. For example, the lower edge seal portion forming step (fifth step) and the side edge seal portion forming step (seventh step) may be performed after the mounting step (fourth step) or the opening portion forming step (sixth step). Good. Also, the mounting process (fourth process) may be performed before the folding process (third process).

  Also, as in the above-described opening forming step (sixth step), the surface film 11 configured integrally with the back surface film 12 is not divided to obtain the first portion 11 a and the second portion 11 b, but The two parts 11 b may be prepared separately from the first part 11 a and the back film 12. For example, a raw fabric in which the laminated film 10 for constituting the first portion 11a and the back film 12 is wound up, and a raw fabric in which the second portion 11b is wound up may be separately prepared.

  Further, as illustrated in FIG. 20 described later, when the opening 15 is formed so as not to overlap the pair of side edge seal portions 22 a, the above-described opening forming step (sixth step) is a surface film Instead of the step of dividing 11, a step of intermittently slitting the surface film 11 to form the opening 15 intermittently along the longitudinal direction of the long surface film 11 may be included. Good. “Intermittently” means that two adjacent openings 15 are not connected to each other. The step of intermittently slitting the surface film 11 to form the openings 15 intermittently is preferably performed after a folding step of folding the laminated film 10 to form a folded portion 10c. This is because it is conceivable that the accuracy of the position of the folding of the laminated film 10 is lowered at the time of folding when performing the folding step after the slit processing.

  In the above-described second to seventh steps, heat welding or cutting is carried out with each of the films 11, 12, 13, 40 in a long state, and then the dividing step (eighth step) is carried out. showed that. However, the present invention is not limited to this, and all or a part of the above-mentioned second to seventh steps are carried out in a state in which the respective films 11, 12, 13, 40 are cut according to the dimensions of the bag 1. It is also good.

  Next, the cross-sectional structure of the portion including the closing film 40 in the side edge seal portion 22a of the bag 1 manufactured as described above will be described. FIG. 14 is a cross-sectional view showing an example of the side edge seal portion 22 a formed in the portion where the closing film 40 is interposed between the front film 11 and the back film 12. As described above, when the closing film 40 extends from one side edge 22 of the bag 1 to the other side edge 22, as shown in FIG. 14, the inner surface 11 x of the front film 11 and the inner surface 12 x of the back film 12 There is a portion where the and do not make direct contact. Even in this case, as shown in FIG. 14, the third type seal portion R3 is formed by thermally welding the inner surface 11x of the surface film 11 and the first surface 40x of the closing film 40, and the back surface film A fourth-type seal portion R4 is formed by heat-welding the inner surface 12x of 12 and the second surface 40y of the closing film 40, whereby between the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12 It is possible to seal. In order to form the fourth type seal portion R4, it is necessary to carry out thermal welding at a temperature higher than the melting point of the material constituting the second surface 40y of the closing film 40. Alternatively, the material of the portion of the second surface 40y of the closing film 40 corresponding to the side edge seal portion 22a may be the same as the material constituting the first surface 40x.

(How to fill fluid)
Next, the method for manufacturing the bag 1 in which the container 1 is filled with the fluid and the container 1 is filled with the fluid will be described.

  First, the filling step of filling the container S with the fluid through the opening 15 will be described. First, as shown in FIG. 15A, the bag 1 is prepared so that the lower edge 23 is positioned downward. Under the present circumstances, although not shown in figure, you may hold | maintain the bag 1 using the grip etc. which hold | grip the side edge seal | sticker part 22a. Next, the fluid is filled from the nozzle of the filling device F into the containing portion S of the bag 1 through the opening 15. Here, as described above, the opening 15 extends from one side edge seal 22a to the other side edge seal 22a. For this reason, the width of the opening at the time of filling can be secured wide.

  Next, the first surface 40x of the closing film 40 and the inner surface 11x of the surface film 11 are at least partially heat welded to form a seal portion, thereby performing the closing step of closing the opening 15. In FIG. 15B and FIG. 16, the closing seal portion formed as the third type sealing portion R3 by heat-welding the first surface 40x of the closing film 40 and the inner surface 11x of the surface film 11 is indicated by reference numeral 42. It is done. FIG. 16 is a cross-sectional view showing the bag in a state where the opening 15 is closed by the closing film 40, and is a cross-sectional view showing the bag 1 shown in FIG. 15B as viewed along line XVI-XVI.

  In the example shown in FIGS. 15B and 16, the closing seal 42 is formed to overlap the opening 15 and to extend from one side edge seal 22a to the other side edge seal 22a. By forming such a closing seal 42, the opening 15 of the fluid-filled bag 1 can be closed to seal the bag 1.

  Preferably, in the closing step, the temperature of heat welding is higher than the melting point of the material forming the thermoplastic resin layer 51 of the first portion 11a and the material forming the first layer 56 of the closing film 40, but for closing The temperature is controlled to be lower than the melting point of the material constituting the second layer 57 of the film 40. Thereby, it is possible to prevent the second layer 57 of the closing film 40 from melting during heat welding, and thereby, the second surface 40 y of the closing film 40 and the outer surface 12 y of the back film 12 Can be prevented from being heat welded.

  By the way, in the closing step, when the surface film 11 and the closing film 40 are heat-welded, the ends of the thermoplastic resin layer 51 and the second portion 11b exposed at the end 11ae of the first portion 11a of the surface film 11 The thermoplastic resin layer 51 exposed to the portion 11be is also heat-welded simultaneously, and the end 11ae and the end 11be may be partially bonded. On the other hand, as long as the temperature of thermal welding is lower than the melting point of the material constituting the base material layer 52 of the surface film 11, the base layer 52 exposed to the end 11ae and the groups exposed to the end 11be The material layer 52 never melts. Therefore, in the bag 1 in a state after the storage portion S is filled with the fluid, as described above, at least the base layer 52 of the layers constituting the surface film 11 is divided in the “opening 15”. Can be defined as

  In FIG. 16, an example is shown in which the closing seal portion 42 is formed so as to overlap the opening 15. However, as long as the closing process is performed so that the opening 15 is surrounded by the mounting seal portion 41 and the closing seal portion 42 between the first surface 40 x of the closing film 40 and the inner surface 11 x of the surface film 11. The specific shape and arrangement of the closing seal portion 42 are not particularly limited. For example, as shown in FIG. 17, a pair of closing seals 42 may be formed to face each other across the opening 15. When the space between the surface film 11 and the closing film 40 on the first portion 11a side is sealed in advance by the mounting seal portion 41 formed before the closing step, the closing seal portion 42 may be formed only between the second portion 11 b of the surface film 11 and the closing film 40. That is, as long as the housing portion S and the space outside the bag 1 can not be communicated via the opening portion 15, various forms can be considered as the shape and the arrangement of the closing seal portion 42.

  As described above, in the bag 1 according to the first embodiment, at least the surface film 11 has the opening 15 penetrating the surface film 11 at a position inside the seal portions 22a and 23a defining the housing portion S. At least partially formed. For this reason, the accommodation part S of the bag 1 can be filled with the fluid through the opening 15 formed in the surface film 11. Further, a closing film 40 is attached to the inner surface 11 x of the surface film 11 so as to at least partially overlap the opening 15. For this reason, the opening portion 15 formed in the surface film 11 can be closed by heat-welding the closing film 40 to the inner surface 11x of the surface film 11 after the accommodation portion S of the bag 1 is filled with the fluid. it can. Therefore, even when the outlet portion 50 is formed in the upper portion of the bag 1, the width of the opening at the time of filling can be secured wide. This makes it possible to provide the bag 1 excellent in the filling ability of the fluid and having the outlet 50.

  Next, the operation of taking out the fluid from the bag 1 manufactured as described above, in which the container S is filled with the fluid, will be described using the outlet 50.

First, the flow path of the fluid in the case of the conventional bag will be described. In the conventional bag, the flow path of the fluid at the outlet portion is formed between a pair of seal portions obtained by heat welding the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12.
In the bag made of the soft packaging material, the flow path of the fluid at the outlet portion is secured by the increase in the distance between the top film 11 and the back film 12 by the pressure from the fluid. In addition, the presence of the fluid inside the outlet increases the rigidity of the outlet during the removal of the fluid. On the other hand, in the conventional bag, since the front film 11 and the back film 12 are fixed to each other on both sides of the flow path of the fluid at the outlet, the front film 11 and the back film 12 are It is hard to spread the interval between. That is, the flow path of the fluid in the outlet portion can not be secured sufficiently large. This means that the amount of the fluid located in the outlet when taking out the fluid is small, which makes it difficult to ensure sufficient rigidity of the outlet. As a result, it may be considered that the outlet part is blocked in the middle of taking out the fluid, or the outlet part is bent in the middle of taking out the fluid.

  On the other hand, in the first embodiment, the outlet portion 50 is formed between the folded portion 10 c of the upper edge 21 and the outlet seal portion 36. The folded back portion 10c is a portion formed by folding back the laminated film 10. Therefore, in the folded back portion 10c, the inner surface 11x of the surface film 11 and the inner surface 12x of the back surface film 12 are not in close contact. For this reason, in the first embodiment, as shown in FIGS. 6 and 7, the folded portion 10c can be formed as a curved portion. For example, the curved portion may be arc-shaped as a whole or U-shaped. In any case, the folded portion 10c has an arc shape having a predetermined radius of curvature.

  As described above, in the first embodiment, by including the folded back portion 10c in the outlet portion 50, compared with the case where the outlet portion is formed between the pair of seal portions, in the vicinity of the upper edge 21. It becomes difficult for the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12 to be in intimate contact. Therefore, in the outlet portion 50, the distance between the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12 can be maintained wide. Therefore, the flow path of the fluid in the outlet portion 50 can be secured sufficiently large, so that a large amount of fluid can be present in the outlet portion 50 when the fluid is taken out. . Thereby, the rigidity of the outlet portion 50 can be sufficiently secured, and thereby, blocking of the outlet portion 50 in the middle of the removal of the fluid can be suppressed. Moreover, it can suppress that the extraction part 50 bends in the middle of the taking-out of a fluid.

  In the first embodiment, the upper edge 21 of the bag 1 is formed by the folded portion 10 c of the laminated film 10, and the folded portion 10 c extends to the outlet 50. Therefore, compared with the case where the upper edge 21 of the bag 1 is formed by the seal portion, the distance between the top film 11 and the back film 12 in the vicinity of the upper edge 21 can be maintained wide. As a result, the flow path of the fluid in the upper edge 21 of the bag 1 can be widely secured. Therefore, when the bag 1 is inclined, the fluid reaching the upper edge 21 of the bag 1 from the accommodation portion S can be It can be smoothly guided toward the outlet 50. Further, a sufficient amount of fluid can be stored along the upper edge 21 of the bag 1 by lengthening the length of the upper edge 21 of the bag 1 constituted by the folded portion 10 c of the laminated film 10. . For this reason, the removability of the fluid can be improved.

  Further, in the bag 1 according to the first embodiment, the distance from the lower edge 23 to the upper edge 21 is at least partially from the one side edge 22 to the other side edge 22 of the pair of side edges 22. Is getting smaller. For example, the distance H2 from the lower edge 23 to the upper edge 21 at the position of the other side edge 22 is smaller than the distance H1 from the lower edge 23 to the upper edge 21 at the position of one side edge 22. And the extraction part 50 is formed in the one side edge 22 side. As a result, the upper edge 21 formed of the folded portion 10 c is inclined upward at a predetermined angle with respect to the lower edge 23 as it goes from the other side edge 22 to the one side edge 22. For this reason, compared with the case where the upper edge 21 extends parallel to the lower edge 23, when the bag 1 is inclined, the fluid flowing from the accommodation portion S to the upper edge 21 of the bag 1 and flowing toward the outlet 50 Can reduce the degree of change of direction performed near the upper edge 21 of the bag 1. As a result, the fluid can be more smoothly introduced toward the outlet portion 50, so that the removability of the fluid can be further improved. In addition, when the bottle to be refilled is in the upright position, it becomes easy to insert the outlet 50 of the bag 1 into the mouth of the bottle. Furthermore, when returning the leaned bag 1 to the original posture, it can suppress that the dripping of a fluid arises.

  In the first embodiment described above, an example is shown in which the folded portion 10c of the upper edge 21 is formed as a curved portion. However, even if the folded-back portion 10c is formed as a bent portion, the inner surface 11x of the surface film 11 is compared to the case where the upper edge 21 of the bag 1 is configured by the seal portion because of the elastic property of the laminated film 10. And the inner surface 12x of the back film 12 are considered to be difficult to adhere to. Therefore, even if the folded portion 10c of the upper edge 21 is a bent portion, the takeout of the fluid can be improved as compared with the conventional bag.

  Note that various changes can be made to the above-described first embodiment. Hereinafter, modifications will be described with reference to the drawings as needed. In the following description and the drawings used in the following description, parts that can be configured similarly to the above-described first embodiment are the same as the reference numerals used for the corresponding parts in the above-described first embodiment. The code is used, and the redundant description is omitted. In addition, when it is clear that the operation and effect obtained in the first embodiment described above can be obtained also in the modified example, the description may be omitted.

(Modification of the opening)
Hereinafter, several modifications of the opening 15 will be described with reference to FIGS. 18A to 23.

  In the above-described first embodiment, an example in which the end 11ae of the first portion 11a of the surface film 11 and the end 11be of the second portion 11b are in contact with or extremely close to each other in the opening 15 showed that. However, the present invention is not limited to this, and as shown in FIGS. 18A and 18B, in the opening 15, between the end 11ae of the first portion 11a of the surface film 11 and the end 11be of the second portion 11b. A predetermined interval may exist. 18A is a cross-sectional view showing the bag 1 with the opening 15 in a state before being closed by the closing film 40, and FIG. 18B shows the opening 15 of the bag 1 shown in FIG. 18A. 40 is a cross-sectional view showing a state closed by 40. FIG. The distance between the end 11ae of the first portion 11a and the end 11be of the second portion 11b when the opening 15 is closed by the closing film 40 is not particularly limited, but is preferably in the range of 0 to 10 mm. It is set inside, More preferably, it sets in the range of 1-7 mm.

  In addition, as shown in FIGS. 19A and 19B, in the opening 15, the end 11ae of the first portion 11a of the surface film 11 overlaps the second portion 11b, and the end 11be of the second portion 11b is the first It may overlap with the portion 11a. FIG. 19A is a cross-sectional view showing the bag 1 with the opening 15 in a state before being closed by the closing film 40, and FIG. 19B is a film for closing the opening 15 of the bag 1 shown in FIG. 19A. 40 is a cross-sectional view showing a state closed by 40. FIG. The width of the overlapping portion of the first portion 11a and the second portion 11b is not particularly limited, but the end portion 11ae of the first portion 11a and the second portion in the state where the opening 15 is closed by the closing film 40 The width of the end 11be of 11b may be set, for example, in the range of 2 to 6 mm.

  In the bag 1 shown in FIG. 19A, the fluid is filled in the storage portion S of the bag 1 through the opening 15 in a state where the second portion 11b is pulled away from the first portion 11a so that the opening 15 is expanded. . Preferably, as shown in FIG. 19A, a portion having a large area among the first portion 11a and the second portion 11b, in this case, the second portion 11b is located on the outer surface side of the bag 1 than the first portion 11a. , And the first portion 11a and the second portion 11b are overlapped. Thereafter, as shown in FIG. 19B, the second portion 11b is pressed toward the closing film 40 so that the portion of the second portion 11b of the surface film 11 not overlapping the first portion 11a contacts the closing film 40. While heating, the inner surface 11x of the second portion 11b and the first surface 40x of the closing film 40 are thermally welded. Thereby, the closing seal 42 for closing the opening 15 can be formed.

  In the first embodiment described above, the opening 15 extends from one side edge seal 22a to the other side edge seal 22a. However, the present invention is not limited to this, and as shown in FIG. 20, the opening 15 does not overlap the pair of side edge seal portions 22a, the one side edge seal portion 22a and the other side edge seal portion It may be formed on the surface film 11 between it and 22a. Even in this case, the storage portion S of the bag 1 can be filled with the fluid through the opening 15. In addition, the opening portion 15 formed in the surface film 11 can be closed by heat-welding the closing film 40 to the inner surface 11x of the surface film 11 after filling the containing portion S of the bag 1 with a fluid. . According to this modification, the sealing property of the bag 1 after closing the opening 15 using the closing film 40 is improved by preventing the opening 15 and the closing film 40 from reaching the side edge seal 22 a. be able to.

  Moreover, in the above-mentioned 1st embodiment, the opening part 15 showed the example extended linearly between one side edge seal part 22a and the other side edge seal part 22a. However, the present invention is not limited to this, and the opening 15 may include a curved portion. In FIG. 21, an example is shown in which the opening 15 includes a curved portion so as to be convex from the bottom to the top of the bag 1. By curving the opening 15 in this manner, the opening 15 can be easily spread during the filling step, whereby the filling ability of the fluid can be further enhanced. Note that, as shown in FIG. 22, the opening 15 includes a portion curved so as to be convex from the lower part of the bag 1 to an upper part, and a part curved so as to be convex from the upper part to the lower part of the bag 1 And may be present repeatedly.

  Moreover, in the above-mentioned 1st embodiment, the example which the opening part 15 extended continuously between one side edge seal part 22a and the other side edge seal part 22a was shown. However, the present invention is not limited to this, and as shown in FIG. 23, a plurality of intermittently extending openings 15 are formed in the surface film 11 as long as the filling aptitude in the filling step can be sufficiently secured. It may be done. In this case, a connecting portion 15 a is present between two adjacent openings 15. The connecting portion 15 a is defined as a portion located between the two openings 15 and in which each layer constituting the surface film 11 is not divided.

  The width of the connecting portion 15a is set so that the connecting portion 15a can be broken by pulling the first portion 11a or the second portion 11b to the outer surface 11y side of the surface film 11 or the like. For this reason, at the time of the filling process, the width of the opening at the time of filling can be secured wide by breaking the connecting part 15a and connecting the openings 15. Further, the presence of the connecting portion 15a causes the first portion 11a and the second portion 11b to be deformed due to a frictional force or the like generated at the time of production or transportation of the bag 1 before the fluid is filled, Distortion of the shape of the portion 15 can be suppressed. That is, the manufacturing aptitude and the transport aptitude of the bag 1 before the fluid is filled can be improved.

  In addition, in the example shown in the above-mentioned FIGS. 20-23, the bag 1 of the state before the accommodating part S is filled with a fluid is shown.

(Modification of film for closing)
Hereinafter, several modifications of the closing film 40 will be described with reference to FIGS. 24 to 27B.

  In the first embodiment described above, an example is shown in which the closing film 40 extends from one side edge 22 of the bag 1 to the other side edge 22. However, the present invention is not limited thereto, and as shown in FIG. 24, the closing film 40 is configured to reach the pair of side edge seal portions 22a but not to reach the pair of side edges 22. May be In addition, in FIG. 24, the bag 1 in the state before the accommodating part S is filled with a fluid is shown. FIG. 25A is an enlarged view of a part surrounded by a frame XXV in FIG. FIG. 25B is a view showing a state in which the opening 15 of the bag 1 shown in FIG. 25A is closed by the closing film 40.

  When the closing film 40 is configured not to reach the pair of side edges 22, as shown in FIG. 25A, the side edge 22 of the side edge seal portion 22 a extending along the side edge 22 of the bag 1. It becomes possible to form the first type seal portion R1 in the portion overlapping the closing film 40 in the orthogonal direction. For this reason, the side edge seal portion 22a can include a first type seal portion R1 continuous from the upper edge 21 to the lower edge seal portion 23a, whereby the bag 1 can be more firmly sealed. FIG. 25A shows an example in which the side edge seal portion 22a includes a third type seal portion R3 formed by heat welding the inner surface 11x of the surface film 11 and the first surface 40x of the closing film 40. But it is not limited to this. In the present modification, although not shown, the third type seal portion R3 may not be included in the side edge seal portion 22a.

  Besides, as shown in FIGS. 26A and 26B, the closing film 40 may be configured not to reach the side edge seal portion 22a. FIG. 26A is a cross-sectional view showing the bag 1 with the opening 15 in a state before being closed by the closing film 40, and FIG. 26B shows the opening 15 of the bag 1 shown in FIG. 40 is a cross-sectional view showing a state closed by 40. FIG.

  As shown in FIG. 26A, when there is a portion where the closing film 40 and the opening 15 do not overlap at a position inside the seal portions 22a and 23a defining the housing portion S, the opening 15 and The opening 15 can not be completely closed only by the mounting seal portion 41 and the closing seal portion 42 formed by heat welding with the closing film 40. In this case, as shown in FIG. 26B, the inner surface 11x of the surface film 11 and the inner surface 12x of the back film 12 are thermally welded so as to sandwich or cover the portion of the opening 15 not overlapping the closing film 40. By forming the one-type seal portion R1, the opening 15 can be closed. In the example shown in FIG. 26B, it can be said that the closing seal portion 42 includes the first type seal portion R1 in addition to the third type seal portion R3. Thus, in the closing step of closing the opening 15, the third type seal R3 between the first surface 40x of the closing film 40 and the inner surface 11x of the surface film 11, and the inner surface 11x and the back surface of the surface film 11 It may be implemented such that the opening 15 is surrounded by the combination of the first type sealing portion R1 with the inner surface 12x of the film 12.

  Moreover, as shown to FIG. 27A and FIG. 27B, the some through-hole 43 may be formed in the film 40 for closing. FIG. 27A is a cross-sectional view showing the bag 1 with the opening 15 in a state before being closed by the closing film 40, and FIG. 27B shows the opening 15 of the bag 1 shown in FIG. 40 is a cross-sectional view showing a state closed by 40. FIG.

  27A and 27B, in the portion of the side edge seal portion 22a overlapping the through hole 43 of the closing film 40, the inner surface 11x of the surface film 11 and the inner surface 12x of the back film 12 via the through hole 43. Can be partially heat-welded to form the first type seal portion R1. This enables the bag 1 to be more tightly sealed. The through hole 43 may be formed not only at the portion overlapping the side edge seal portion 22 a of the closing film 40 but also at a position inside the seal portions 22 a and 23 a. In addition, one through hole 43 may be formed.

(Modified example of combination of closing film and opening)
Hereinafter, with reference to FIGS. 28A to 30C, several modified examples of the combination of the closing film 40 and the opening 15 will be described. In each modification shown in FIGS. 28A to 30C, the opening 15 is configured not to reach the side edge seal 22 a and to have a predetermined opening width t in the direction along the side edge 22. Such an opening 15 may be formed, for example, by partially cutting out the surface film 11 using a predetermined mold.

  In the example shown in FIGS. 28A and 28B, the closing film 40 is configured to extend from one side edge 22 of the bag 1 to the other side edge 22. FIG. 28A is a cross-sectional view showing the bag 1 with the opening 15 in a state before being closed by the closing film 40, and FIG. 28B shows the opening 15 of the bag 1 shown in FIG. 40 is a cross-sectional view showing a closed state by 40; In this modification, as shown in FIG. 29B, the accommodation portion of the bag 1 is formed by forming the closure seal portion 42 so that the opening portion 15 is sandwiched between the attachment seal portion 41 and the closure seal portion 42. After filling the fluid with S, the opening film 15 can be used to close the opening 15. The mounting seal portion 41 and the closing seal portion 42 are both formed to extend from one side edge seal portion 22a to the other side edge seal portion 22a.

  In the example shown in FIGS. 29A and 29B, the closing film 40 is configured to reach the pair of side edge seal portions 22 a but not reach the pair of side edges 22. FIG. 29A is a cross-sectional view showing the bag 1 with the opening 15 in a state before being closed by the closing film 40, and FIG. 29B is a film for closing the opening 15 of the bag 1 shown in FIG. 29A. 40 is a cross-sectional view showing a closed state by 40; Also in this modification, as in the case shown in FIGS. 28A and 28B described above, the closing seal portion 42 is formed so that the opening 15 is sandwiched between the mounting seal portion 41 and the closing seal portion 42. Thus, after the container S of the bag 1 is filled with the fluid (see FIG. 29B), the opening film 15 can be used to close the opening 15.

  In the example shown in FIGS. 30A and 30B, the closing film 40 is configured not to reach the side edge seal portion 22a. FIG. 30A is a cross-sectional view showing the bag 1 with the opening 15 in a state before being closed by the closing film 40, and FIG. 30B is a film for closing the opening 15 of the bag 1 shown in FIG. It is sectional drawing which shows an example of the state closed by 40. FIG. 30C is a cross-sectional view showing another example of the state where the opening 15 of the bag 1 shown in FIG. 30A is closed by the closing film 40.

  In the example shown in FIG. 30B, the closing seal portion 42 is a third type sealing portion R3 extending along the opening portion 15 so as to sandwich the opening portion 15 with the mounting sealing portion 41; It includes a third type seal R3 extending along the side edge 22 between the side edge seal 22a and the side edge seal 22a. By this, as shown to FIG. 30B, the opening part 15 comes to be enclosed by 3rd type seal part R3, and the opening part 15 can be closed.

  On the other hand, in the example shown in FIG. 30C, the closing seal portion 42 extends along the opening portion 15 so as to sandwich the opening portion 15 with the mounting sealing portion 41, and the opening portion A first type seal R1 extending along the side edge 22 between the side edge seal portion 22a and the side edge seal portion 22a is included. As a result, as shown in FIG. 30C, the opening 15 is surrounded by the combination of the third type sealing portion R3 and the first type sealing portion R1, and the opening 15 can be closed.

(Modification of members that make up the bag)
In the first embodiment described above, an example is shown in which the laminated film 10 constituting the front film 11 and the back film 12 and the lower film 13 are different from each other. However, the invention is not limited to this, and the laminated film 10 and the lower film 13 may be integrally configured. For example, as shown below, the front film 11, the back film 12, and the lower film 13 may be configured by folding back the laminated film 10.

  In the present modification, first, as shown in FIG. 31, the laminated film 10 and the closing film 40 are prepared. As shown in FIG. 31, a plurality of through holes 13 e may be formed in the laminated film 10. The through hole 13 e is to be the notch 13 d of the bag 1 later.

  Next, a folding step is performed to fold the laminated film 10 so that two folded portions 10 c are formed on the laminated film 10. In the folding step, as shown in FIG. 32, an opening 15 is formed between one end 10s and the other end 10t of the laminated film 10 extending along the transport direction T, and at least the closing film 40 is formed in the opening 15. It is carried out so as to partially overlap. Further, one of the two folded portions 10c is pushed inward. As a result, as shown in FIG. 32, the first portion 11a and the second portion 11b opposed to each other across the opening 15 by a single laminated film 10 and the surface film 11 integrally with the folded portion 10c. The back film 12 comprised and the lower film 13 integrally comprised with the back film 12 and the 2nd part 11b can be obtained. Thereafter, an attaching step of attaching the closing film 40 to the first portion 11a, a lower edge seal portion forming step of forming the lower edge seal portion 23a, a side edge seal portion forming step of forming the side edge seal portion 22a, each film 11, The bag 1 can be obtained by performing a parting process or the like in which the parts 12, 13, 40 are divided along the shape of the outer edge of the bag 1.

  In the present modification, the order in which the respective steps are performed is not particularly limited. For example, the mounting process may be performed before the folding process.

(Modification of bag manufacturing method)
In the first embodiment described above, an example is shown in which the plurality of bags 1 are allocated in one row along the transport direction T of each long film. However, the present invention is not limited to this, and a plurality of bags 1 may be allocated to a plurality of rows along the transport direction T of each long film. Hereinafter, first to third modifications in which the plurality of bags 1 are allocated to two rows along the transport direction T of each long film will be described.

(First Modified Example of Bag Manufacturing Method)
First, in the same manner as in the first embodiment described above, a long laminate film 10 is produced (production process of laminate film (first process)). Next, as shown in FIG. 33, a long laminate film 10, a lower film 13, and a closing film 40 are prepared (a film preparing process (second process)). Here, as shown in FIG. 33, two long closing films 40 are prepared.

[Folding step (third step)]
Next, as shown in FIG. 34, the long laminated film 10 is folded back to perform a folding step of forming a folded portion 10c. Further, the elongated lower film 13 is folded back to form a folded portion 13c. Here, as shown in FIG. 34, two folded portions 10 c are formed in the laminated film 10, and two folded portions 13 c are formed in the lower surface film 13. Further, one end 10s and the other end 10t of the laminated film 10 extending along the transport direction T are close to each other, and one end 13s and the other end 13t of the lower surface film 13 extending along the transport direction T are close to each other. As a result, the long surface film 11 and the long back film 12 integrally formed with the front film 11 through the folded portion 10 c are disposed between the front film 11 and the back film 12. And two sets of film structures can be obtained, including the bottom film 13 folded back along the folded portion 13c.

  Preferably, the gap between one end 10s and the other end 10t of the laminated film 10 and the gap between the one end 13s and the other end 13t of the lower surface film 13 are in the normal direction of the surface film 11 or the back film 12. At least partially overlapping when viewed along.

  Next, as shown in FIG. 35, an attaching process (fourth process) is performed to attach the closing film 40 to the inner surface 11x of the surface film 11 of each film structure. In addition, as shown in FIG. 35, the lower edge seal portion forming step (the lower edge seal portion 23a is formed by thermally welding the inner surface 13x of the lower surface film 13 to the inner surface 11x of the front surface film 11 and the inner surface 12x of the rear surface film 12) Implement the fifth step).

[Aperture Forming Step (Sixth Step)]
Next, using a cutter blade or the like provided so as to extend along the transport direction T of the elongated surface film 11, the surface film 11 of each film structure is continuously transported to the two of the surface film 11 The opening forming process is performed to cut into parts, thereby obtaining the elongated first part 11a and the second part 11b, and forming the opening 15 between the first part 11a and the second part 11b. . Here, as shown in FIG. 36, a portion of the surface film 11 of each film structure overlapping with the closing film 40 is cut at least partially to form an opening between the first portion 11a and the second portion 11b. Form 15

[Side Edge Sealed Part Forming Step (Seventh Step)]
Next, along the side edge 22 of the top film 11 and the side edge 22 of the back film 12 between the inner surface 11 x of the top film 11 and the inner surface 12 x of the back film 12 at least partially by heat welding. The side edge seal portion forming step of forming the side edge seal portion 22a described above is performed. As a result, the housing portion S is defined inside the side edge seal portion 22a and the lower edge seal portion 23a.

[Parting step (eighth step)]
Thereafter, a dividing step of dividing the long films 11, 12, 13, 40 thermally welded to each other along the shape of the outer edge of the bag 1 is performed. In the present modification, two folded portions 10 c are formed in the laminated film 10, and two folded portions 13 c are formed in the lower surface film 13. Further, as shown in FIG. 36, the closing film 40 is provided on both the first portion 11a in contact with one of the two folded portions 10c and the first portion 11a in contact with the other folded portion 10c. It is attached. That is, there are two film structures for producing the bag 1 along the direction intersecting with the transport direction T of the film. For this reason, as shown in FIG. 37, a plurality of bags 1 can be allocated to two rows along the transport direction T of each long film. In the example shown in FIG. 37, in the bag 1, the lower edge 23 of the bag 1 in one of the two rows and the lower edge 23 of the bag 1 in the other row both have one end 10s of the laminated film 10 It is imposed so as to face the gap between the other end 10t. In the bag 1, the outlet port 50 of the bag 1 in one of the two rows faces the upstream side in the transport direction T, and the outlet port 50 of the bag 1 in the other row is the downstream of the transport direction T It is imposed to face the side.

(Second variation of bag manufacturing method)
In the above-described first modification shown in FIGS. 33 to 37, an example is shown in which the surface films 11 of the bags 1 allocated to two rows are all located on the same side of the folded back laminated film 10. . In the present modification, an example will be described in which the surface films 11 of the bags 1 allocated to two rows are located on different sides of the folded laminated film 10. In the following description, the description of steps performed similarly to the above-described first modification will be appropriately omitted.

  First, a long laminate film 10 is produced (production process of laminate film (first process)). Next, the long laminated film 10, the lower film 13, and the closing film 40 are prepared (a film preparing process (second process)). Next, as shown in FIG. 38, a folding step (third step) of folding the long laminate film 10 to form a folded portion 10c is performed. Thereafter, as shown in FIG. 39, an attaching step (fourth step) of attaching the closing film 40 to the inner surface 11x of the surface film 11 is performed. Further, the lower edge seal portion forming step (fifth step) of thermally welding the inner surface 13x of the lower surface film 13 to the inner surface 11x of the front surface film 11 and the inner surface 12x of the back surface film 12 to form the lower edge seal portion 23a is performed. Do.

  In the mounting step (fourth step) of this modification, one closing film 40 is attached to one side of the folded back laminated film 10, and the other side of the folded back laminated film 10 is Attach a sheet of closing film 40. Thereby, as shown in FIGS. 39 and 40, the surface film 11 and the back film 12 in contact with one of the two folded portions 10c, and the surface film 11 and the back film in contact with the other folded portion 10c. 12 will be located on different sides.

  Next, as shown in FIG. 40, the surface film 11 is cut to form the first portion 11a and the second portion 11b, and an opening portion is formed between the first portion 11a and the second portion 11b. The formation step (sixth step) is performed. Further, as in the case of the first modified example, the side edge seal portion forming step (seventh step) and the dividing step (the eighth step) are performed. As a result, as shown in FIG. 41, the plurality of bags 1 can be allocated to the two rows along the transport direction T of each long film. In the example shown in FIG. 41, in the bag 1, the lower edge 23 of the bag 1 in one of the two rows and the lower edge 23 of the bag 1 in the other row both have one end 10s of the laminated film 10 It is imposed so as to face the gap between the other end 10t. Also, the bags 1 are surfaced so that the outlet 50 of the bag 1 of one of the two rows and the outlet 50 of the bag 1 of the other row both face the upstream side in the transport direction T. ing.

(Third variation of bag manufacturing method)
In the above-described first modification shown in FIGS. 33 to 37, the lower edge 23 of the bag 1 in one of the two rows and the lower edge 23 of the bag 1 in the other row are the transport direction T An example is shown in which the bags 1 are assigned so that they do not overlap each other when viewed along. In the present variant, the lower edge 23 of the bag 1 in one of the two rows and the lower edge 23 of the bag 1 in the other row partially when seen along the transport direction T. An example in which the bags 1 are allocated so as to overlap will be described. In the following description, the description of steps performed similarly to the above-described first modification will be appropriately omitted.

  First, a long laminate film 10 is produced (production process of laminate film (first process)). Next, the long laminated film 10, the lower film 13, and the closing film 40 are prepared (a film preparing process (second process)). In this modification, as shown in FIG. 42, an annular film not having a cut or an end along the transport direction T is prepared as the closing film 40.

  Next, as shown in FIG. 42, a folding step (third step) of folding the long laminate film 10 to form a folded portion 10c is performed. At this time, as shown in FIG. 42, the laminated film 10 is folded back so that an opening 15 is formed between the one end 10s and the other end 10t of the long laminated film 10 extending along the transport direction T. Thereafter, as shown in FIG. 43, an attaching step (fourth step) is performed in which the closing film 40 is attached to the inner surface 11x of the surface film 11, respectively. Further, the lower edge seal portion forming step (fifth step) of thermally welding the inner surface 13x of the lower surface film 13 to the inner surface 11x of the front surface film 11 and the inner surface 12x of the back surface film 12 to form the lower edge seal portion 23a is performed. Do.

  Next, as shown in FIG. 44, of the two sets of film structures, the surface film 11 of the film structure in which the opening 15 is not yet formed is cut to form a first portion 11a and a second portion 11b. An opening forming step (sixth step) of forming the opening 15 between the first portion 11a and the second portion 11b is performed. Further, as in the case of the first modified example, the side edge seal portion forming step (seventh step) and the dividing step (the eighth step) are performed. As a result, as shown in FIG. 45, the plurality of bags 1 can be allocated to the two rows along the transport direction T of each long film. In the example shown in FIG. 45, the bag 1 is imposed such that the lower edge 23 of the bag 1 in one of the two rows is opposed to the lower edge 23 of the bag 1 in the other row. In the bag 1, the outlet port 50 of the bag 1 in one of the two rows faces the upstream side in the transport direction T, and the outlet port 50 of the bag 1 in the other row is the downstream of the transport direction T It is imposed to face the side.

  In this modification, the laminated film 10 is folded back so that the one end 10s and the other end 10t of the laminated film 10 are not positioned between the two bags 1 allocated along the direction crossing the film transport direction T. The laminated film 10 and the lower film 13 are disposed such that the opening 15 formed between the one end 10s and the other end 10t of the laminated film 10 and the lower film 13 do not overlap in plan view. Further, as the lower surface film 13, an annular film having no cut or end portion is used. For this reason, as shown in FIG. 45, when the lower edge 23 of the bag 1 of one of the two rows and the lower edge 23 of the bag 1 of the other row are viewed along the transport direction T, The bags 1 can be allocated so that they partially overlap. By this, when producing bag 1 using a long film, the quantity of the film which is wasted can be reduced.

(Modification of closing member)
In the first embodiment described above, an example in which the closing film 40 is used as a closing member for closing the opening 15 has been shown. However, the present invention is not limited to this, and a plastic molding may be used as a closing member for closing the opening 15. A plastic molded body is obtained by molding and solidifying a synthetic resin. The method for forming the plastic molded body is not particularly limited, and known methods such as a sheet molding method, an injection molding method, an extrusion molding method and a blow molding method may be appropriately used.

  In the sheet forming method, first, a mold having a surface shape corresponding to the shape of the closing member is prepared. Next, a sheet made of a synthetic resin which has been heated and softened is set in a mold. Thereafter, the sheet is brought into close contact with the mold using vacuum force or compressed air force, thereby imparting the shape of the mold to the sheet. In this way, it is possible to obtain a plastic molding for constructing the closing member.

  In the injection molding method, first, a mold having a surface shape corresponding to the shape of the closing member is prepared. Next, the mold is filled with a synthetic resin heated to a temperature at which it becomes fluid. By solidifying the synthetic resin in contact with the mold, it is possible to obtain a plastic molded body along the surface shape of the mold.

  In the extrusion molding method, first, a mold, also called a die, is prepared which is provided with a hole corresponding to the cross-sectional shape of the closing member. Next, the synthetic resin is molded by extruding the synthetic resin heated to a temperature at which it becomes fluid, through the holes of the mold. Thereafter, by cooling the synthetic resin, plastic molded articles having the same cross-sectional shape can be continuously obtained. In the extrusion molding method, since the synthetic resin extruded from the mold is softened by heat, it can be considered that the synthetic resin is deformed before the synthetic resin is cooled and solidified. In order to suppress the occurrence of such deformation, the synthetic resin is preliminarily cooled while maintaining the shape of the synthetic resin between the mold and a cooling device for performing final cooling, for example, a water tank. A precooling step may be performed. For example, a so-called sizing die can be used to preliminarily cool the synthetic resin while suppressing deformation of the synthetic resin. The sizing dies are provided, for example, on the side of the water tank for performing the final cooling.

Second Embodiment In the above-described first embodiment and each modification, a closing member such as a closing film 40 is attached to the inner surface 11x of the surface film 11 so as to overlap the opening 15. The example which closes the opening part 15 was shown. However, the method of closing the opening 15 is not limited thereto. Hereinafter, as an embodiment of the second invention (hereinafter, also referred to as a second embodiment), the inner surface 11x of the first portion 11a of the surface film 11 and the inner surface 11x of the second portion 11b are thermally welded The example which forms the sealing part 17 for closing which closes the opening part 15 formed between the 1st part 11a and the 2nd part 11b is demonstrated. In the following description, for portions that can be configured in the same manner as in the above-described first embodiment, the same symbols as used for the corresponding portions in the above-described first embodiment are used. Duplicate descriptions may be omitted.

  FIG. 46 is a front view showing the entire bag 1 according to the second embodiment. In FIG. 46, the bag 1 in a state before being filled with the fluid is shown. As in the case of the first embodiment described above, in the second embodiment, the outer edge of the bag 1 is the upper edge 21, the lower edge 23 opposite to the upper edge 21, the upper edge 21 and the lower edge And a pair of side edges 22 extending between the edges 23. Further, the upper edge 21 is constituted by a folded portion 10 c formed by folding a portion to be the first portion 11 a of the surface film 11 in the laminated film with respect to the back film 12. Then, at a position where the upper edge 21 and one side edge 22 of the front film 11 and the back film 12 intersect, an outlet through which the fluid stored in the storage unit S is taken out to the outside of the bag 1 50 are formed. The bag 1 also includes a lower edge seal portion 23 a formed along the lower edge 23 and a pair of side edge seal portions 22 a formed along the pair of side edges 22. The accommodating part S in which the fluid is accommodated is defined inside the seal parts 22a and 23a.

  As shown in FIG. 46, also in the second embodiment, at least the surface film 11 of the surface film 11 and the back film 12 is formed with an opening 15 that penetrates the surface film 11. 47A is a cross-sectional view showing a portion of the bag 1 shown in FIG. 46 in which the upper edge 21 and the opening 15 are formed. 47B is a cross-sectional view showing a portion of the bag 1 shown in FIG. 46 in which the upper edge 21, the outlet 50, and the side edge seal 22a are formed, as shown in FIG. 47A. In the embodiment, the bag 1 is configured such that the end 11 ae of the first portion 11 a of the surface film 11 and the end 11 be of the second portion 11 b are adjacent to each other across the opening 15. Further, the first portion 11a and the second portion 11b are in a contact state in which the inner surface 11x of the first portion 11a and the inner surface 11x of the second portion 11b partially contact, and the inner surface 11x of the first portion 11a and the second It is comprised so that the open state which can form a clearance gap between it and the inner surface 11x of the part 11b can be taken.

  More specifically, in the second embodiment, the surface film 11 including the first portion 11a and the second portion 11b has a film length from the upper edge 21 to the end 11ae of the first portion 11a, and The sum of the film length from the end 11be of the second portion 11b to the lower edge 23 is longer than the shortest distance between the upper edge 21 and the lower edge 23. Therefore, as shown in FIG. 47A, the first portion 11a is curved or bent so that the end 11ae is located outside the bag 1, and the second portion is also located so that the end 11be is located outside the bag 1. When 11b is bent or bent, a certain area (hereinafter also referred to as a first projecting area) including the end 11ae of the inner surface 11x of the first portion 11a of the surface film 11 and the inner surface 11x of the second portion 11b The predetermined area including the end 11be (hereinafter, also referred to as a second projecting area) comes to face each other. At this time, the inner surface 11x of the first projecting region of the first portion 11a and the inner surface 11x of the second projecting region of the second portion 11b are at least partially prevented from being thermally welded to each other. That is, an unsealed portion is present at least partially between the inner surface 11x of the first projecting region of the first portion 11a and the inner surface 11x of the second projecting region of the second portion 11b. For example, of the inner surface 11x of the first projecting area of the first portion 11a and the inner surface 11x of the second projecting area of the second portion 11b, a portion not overlapping the pair of side edge seal portions 22a in plan view is a non-sealed portion. . In this case, the distance between the inner surface 11x of the first projecting area of the first portion 11a and the inner surface 11x of the second projecting area of the second portion 11b is increased, thereby the inner surface 11x of the first projecting area of the first portion 11a. And the inner surface 11x of the second projecting area of the second portion 11b, the container S can be filled with the fluid. That is, the gap between the inner surface 11x of the first projecting region of the first portion 11a and the inner surface 11x of the second projecting region of the second portion 11b is used as the opening 15 for filling the container S with the fluid. can do. Note that “the end 11 ae is located outside the bag 1” and “the end 11 be is located outside the bag 1” means that the inner surface 11 x of the surface film 11 is opposed to the inner surface 12 x of the back film 12 It means that the end 11 ae and the end 11 be are located outside (the side farther from the accommodation portion S) than the portions.

  As shown in FIG. 47B, in the portion of the first projecting area of the first portion 11a and the second projecting area of the second portion 11b overlapping the pair of side edge seal portions 22a in plan view, the first portion 11a is The first type seal portion R1 may be formed by heat welding the inner surface 11x of the first protruding region and the inner surface 11x of the second protruding region of the second portion 11b.

(Method of manufacturing bag)
Next, a method of manufacturing the bag 1 according to the second embodiment will be described. First, in the same manner as in the first embodiment described above, a long laminate film 10 is produced (production process of laminate film (first process)). Next, the obtained long laminated film 10 is prepared (a film preparing step (second step)).

[Folding step (third step)]
As shown next, the folding process which folds the elongate laminated film 10 and forms the folding part 10c is implemented. FIG. 48 is a cross-sectional view showing a case where the long laminate film 10 is cut along a direction orthogonal to the direction orthogonal to the transport direction T of the laminate film 10. As shown in FIG. In this step, as shown in FIG. 48, the first inner plate 61 having a width larger than the length of at least the side edge 22 in the direction orthogonal to the transport direction T of the laminated film 10 is the inner surface 10 x of the laminated film 10. It may be disposed above. Under this condition, first, as shown in FIG. 48, the elongated laminated film 10 is folded along the end of the first inner plate 61 to form folded portions 10c at two locations. At this time, as shown in FIG. 48, a region including one end 10s of the inner surface 10x of the laminated film 10 and a region including the other end 10t overlap in a predetermined range.

  In the folding step, as shown in FIG. 48, the laminated film 10 is disposed on the upper side of the first inner plate 61, here on the upper side of the first inner plate 61, and on the lower side of the first inner plate 61, here. It is divided into the back film 12 located. The surface film 11 includes a first portion 11a including one end 10s and a second portion 11b including the other end 10t. In order to partially align the first portion 11a of the surface film 11 with the surface of the first inner plate, as shown in FIG. 48, the first outer plate 62 may be used to press the first portion 11a.

[Provisional seal portion forming step (fourth step)]
After the folding step, as shown in FIG. 48, the step of thermally welding the inner surface 11x of the first portion 11a and the inner surface 11x of the second portion 11b in the vicinity of the one end 10s and the other end 10t to form the temporary seal portion 16. May be implemented. Thereby, the one end 10s and the other end 10t can be fixed to each other. For example, the temporary seal portion 16 can be formed in a region near the tip of the first projecting portion of the first portion 11a and the second projecting portion of the second portion 11b. The temporary seal portion 16 may be formed to extend from one side edge 22 of the laminated film 10 to the other side edge 22.

[Lower edge seal forming process (fifth process)]
Thereafter, as shown in FIG. 49, the folded portion 10c between the second portion 11b and the back film 12 is pushed inward. By this, it is possible to obtain the lower surface film 13 which is integrally formed with the second portion 11 b and the back surface film 12 and in which the folded portion 13 c is formed. Further, as shown in FIG. 49, the lower edge seal portion 23a may be formed by thermally welding the inner surface 13x of the lower surface film 13 to the inner surface 11x of the surface film 11 and the inner surface 12x of the back film 12.

[Aperture Forming Step (Sixth Step)]
Thereafter, as shown in FIG. 50, the vicinity of the one end 10s and the other end 10t of the laminated film 10 is cut so that the temporary seal portion 16 is removed, thereby between the first portion 11a and the second portion 11b. To form an opening 15.

  Next, the side edge seal portion forming step (seventh step) and the dividing step (the eighth step) are performed in the same manner as in the first embodiment and the modifications described above. By this, it is possible to obtain the bag 1 provided with the opening 15 formed in the unsealed portion between the inner surface 11x of the first portion 11a of the surface film 11 and the inner surface 11x of the second portion 11b shown in FIG. .

(How to fill fluid)
Next, the method for manufacturing the bag 1 in which the container 1 is filled with the fluid and the container 1 is filled with the fluid will be described. First, the bag 1 manufactured as described above is prepared. Next, the filling step of filling the container S with the fluid through the opening 15 is performed. For example, as shown in FIG. 51, the bag 1 is placed on the back side so as to realize the above-mentioned opening state by enlarging the space between the inner surface 11x of the first portion 11a of the surface film 11 and the inner surface 11x of the second portion 11b. The film 12 is folded along a portion located between the first portion 11a and the second portion 11b. Next, the fluid is filled from the nozzle of the filling device F into the containing portion S of the bag 1 through the opening 15. Also in the second embodiment, the opening 15 extends from one side edge seal 22a to the other side edge seal 22a. For this reason, the width of the opening at the time of filling can be secured wide.

  Next, a closing step is performed in which the inner surface 11x of the first portion 11a of the surface film 11 and the inner surface 11x of the second portion 11b are thermally welded to form the closing seal portion 17. Specifically, after the above-mentioned filling process, the folded bag 1 is returned to the original state, whereby the contact where the inner surface 11x of the surface film 11 and the inner surface 11x of the second portion 11b partially contact Realize the state. Next, the inner surface 11x of the surface film 11 and the inner surface 11x of the second portion 11b are thermally welded and extended along the opening 15 as shown in FIG. 52, and the seal for closing is formed of the first type seal portion R1. The portion 17 is formed. FIG. 53 is a front view showing the bag 1 in a state in which the container S is filled with the fluid and the opening 15 is closed. In FIG. 53, an example is shown in which the first type seal portion R1 is formed over the entire area of the first projecting area of the first portion 11a and the second projecting area of the second portion 11b. However, as long as the opening 15 can be closed to seal the bag 1, that is, as long as the closing seal 17 is formed from one side edge seal 22a to the other side edge seal 22a. In the above, the first type seal portion R1 may not be formed over the entire area of the first projecting area of the first portion 11a and the second projecting area of the second portion 11b.

  As described above, in the bag 1 according to the second embodiment, at least the surface film 11 has the opening 15 penetrating the surface film 11 of the inner surface 11x of the first portion 11a of the surface film 11 and the second portion 11b. It is formed between the inner surface 11x. For this reason, the accommodation part S of the bag 1 can be filled with the fluid through the opening 15 formed in the surface film 11. In addition, after filling the storage portion S of the bag 1 with a fluid, the inner surface 11x of the first portion 11a of the surface film 11 and the inner surface 11x of the second portion 11b are thermally welded to form the closing seal portion 17. Thus, the opening 15 formed in the surface film 11 can be closed. Therefore, even when the outlet portion 50 is formed in the upper portion of the bag 1, the width of the opening at the time of filling can be secured wide. This makes it possible to provide the bag 1 excellent in the filling ability of the fluid and having the outlet 50.

  Also in the second embodiment, the outlet portion 50 is formed between the folded portion 10 c of the upper edge 21 and the outlet seal portion 36 as in the first embodiment described above. There is. For this reason, a large amount of fluid can be present in the outlet 50 during the removal of the fluid. Thereby, the rigidity of the outlet portion 50 can be sufficiently secured, and thereby, blocking of the outlet portion 50 in the middle of the removal of the fluid can be suppressed. Moreover, it can suppress that the extraction part 50 bends in the middle of the taking-out of a fluid.

(Modification of members that make up the bag)
In the first and second embodiments described above and their variations, one laminated film 10 folded back along the folded portion 10 c is the first portion 11 a of the surface film 11 and the back film 12. An example of configuring the entire area is shown. However, as long as the upper edge 21 includes the folded portion 10 c formed by folding back the laminated film 10 constituting at least a part of the front film 11 and at least a part of the back film 12, the front film 11 and the back surface The relationship between the film 12 and the laminated film 10 is not particularly limited. For example, as shown in FIG. 54, the back film 12 constituting the bag 1 includes a first portion 12 a located on the upper side of the bag 1 and a second portion 12 b located on the lower side of the bag 1. It is also good. In this case, the upper edge 21 includes a folded portion 10 c formed by folding back the laminated film 10 constituting the first portion 11 a of the surface film 11 and the first portion 12 a of the back film 12.

  The method of connecting the first portion 12a and the second portion 12b of the back film 12 is not particularly limited, and various methods may be employed. For example, as shown in FIG. 55, the first portion 12a and the first portion 12a are thermally fused by heat welding the outer surface 12y of the first portion 12a of the back film 12 and the inner surface 12x of the second portion 12b. The two parts 12 b may be connected. In this case, at least a portion of the first portion 12a of the back film 12 where the connection seal portion 18a is formed may be formed of a thermoplastic resin layer. When the portion of the first portion 12 a of the back film 12 where the connection seal portion 18 a is formed is formed by the base layer 52, heat welding is performed at a temperature higher than the melting point of the base layer 52. You may implement.

  Further, as shown in FIG. 56, the connecting film 18b may be used to connect the first portion 12a and the second portion 12b of the back film 12. As a method of fixing the connecting film 18b to the first portion 12a and the second portion 12b, for example, heat welding can be employed. Although FIG. 56 shows an example in which the connecting film 18b is fixed to the inner surface 12x of the first portion 12a and the inner surface 12x of the second portion 12b, the present invention is not limited thereto. The film 18b may be fixed to the outer surface 12y of the first portion 12a and the outer surface 12y of the second portion 12b.

  Moreover, in the above-mentioned FIG. 55 and FIG. 56, the example which the outer surface 12y of the 1st part 12a of the back surface film 12 and the inner surface 12x of the 2nd part 12b are partially connected was shown. However, the invention is not limited to this, and although not shown, the inner surface 12 x of the first portion 12 a of the back film 12 and the outer surface 12 y of the second portion 12 b may be partially connected.

(Modification of the direction in which the upper edge and the opening extend)
In the first and second embodiments described above and their variations, the upper edge 21 and the opening 15 extend substantially parallel to each other, and the direction in which the upper edge 21 and the opening 15 extend is the lower edge 23. An example is shown in which it is inclined at a predetermined angle with respect to the direction in which. However, as long as the upper edge 21 includes the laminated film 103 and the opening 15 is formed in the surface film 11, the extending direction of the upper edge 21 and the outlet 50 is not particularly limited.

  For example, as shown in FIG. 57, the folded portion 10c of the upper edge 21 may be inclined at a predetermined angle with respect to the opening 15. In this case, the opening 15 and the lower edge 23 may extend substantially parallel to each other.

  As shown in FIG. 58, the folded portion 10c of the upper edge 21, the opening 15 and the lower edge 23 may extend substantially parallel to one another.

(Modification of outlet part)
In the first and second embodiments described above and their modifications, the example in which the outlet portion 50 is formed on the side of one side edge 22 of the pair of side edges 22 has been shown. However, the invention is not limited thereto, and the outlet 50 may be formed on both the side edge 22 and the side edge 22.

  Although some modifications to the first and second embodiments described above have been described, it is of course possible to apply a plurality of modifications in combination as appropriate.

DESCRIPTION OF SYMBOLS 1 bag 10 laminated film 10c return part 10s one end 10t other end 11 surface film 11a 1st part 11b 2nd part 12 back surface film 13 lower film 13c return part 13d notch 13e through hole 13s one end 13t other end 15 opening 15a connection part 15b Unsealed portion 16 Temporary seal portion 17 Sealed portion for closing 18a Sealed portion for connection 18b Connecting film 21 upper edge 22 side edge 22a side edge sealed portion 23 lower edge 23a lower edge sealed portion 35 opening scheduled portion 36 outlet seal portion 37 Notches 38 Notches 40 Closing film 41 Seals for attachment 42 Seals for closing 43 Through holes 50 Vents 51 Thermoplastic resin layer 52 Base layer 53 Second thermoplastic resin layer 56 First layer 57 Second layer 61 first inner plate 62 first outer plate

Claims (15)

It is a bag in which a storage section to be filled with a fluid is formed,
At least a front film and a back film,
The outer edge of the bag includes an upper edge, a lower edge opposite the upper edge, and a pair of side edges extending between the upper edge and the lower edge,
The upper edge at least partially includes a folded portion formed by folding back a laminated film that constitutes at least a part of the front film and at least a part of the back film,
The front film and the back film are formed with an outlet through which fluid flowing along the folded portion of the upper edge is taken out.
The housing portion is defined inside a seal formed between the inner surface of the front film and the inner surface of the back film by heat welding along the lower edge and the pair of side edges of the bag.
Among the front surface film and the back surface film, at least the front surface film, an opening passing through the front surface film is a position inside the seal portion which defines the housing portion, and At least partially formed below the outlet,
The bag further comprises a closing member attached to the inner surface of the face film so as to at least partially overlap the opening;
The closing member includes a first surface opposite to the surface film, and a second surface opposite to the first surface,
A bag, wherein the first layer constituting the first surface of the closing member is at least partially made of a material that can be heat welded to the inner surface of the surface film. The second layer constituting the second surface of the closing member is made of a material having a melting point higher than that of the material constituting the first layer of the closing member, or
The bag according to claim 1, wherein the second surface of the closing member is provided with an inhibitor that inhibits heat welding from occurring with the inner surface of the back film. It is a bag in which a storage section to be filled with a fluid is formed,
At least a front film and a back film,
The outer edge of the bag includes an upper edge, a lower edge opposite the upper edge, and a pair of side edges extending between the upper edge and the lower edge,
The upper edge at least partially includes a folded portion formed by folding back a laminated film that constitutes at least a part of the front film and at least a part of the back film,
The front film and the back film are formed with an outlet through which fluid flowing along the folded portion of the upper edge is taken out.
The surface film includes at least a first portion and a second portion adjacent to each other across an opening penetrating the surface film,
The first portion and the second portion are in a contact state in which the inner surface of the first portion and the inner surface of the second portion partially contact, and the inner surface of the first portion and the inner surface of the second portion Are configured to be in an open state in which a gap is formed between the
The upper edge is configured to be inclined relative to the lower edge ,
The folded portion extends from one side to the other of a pair of seal portions formed along the pair of side edges .   The bag according to any one of claims 1 to 3, wherein the folded portion of the upper edge is formed in an arc shape. The distance from the lower edge to the upper edge is at least partially reduced from one side edge to the other side edge of the pair of side edges,
The bag according to any one of claims 1 to 4, wherein the outlet portion is formed on the side of the one side edge of the pair of side edges of the front surface film and the back surface film.   The unsealing planned part which becomes an outlet by being opened is formed in the outlet part, and the fluid which has flowed along the folded portion is taken out from the outlet. The bag according to any one of the preceding claims. The opening is formed in the surface film so as to extend from one side edge of the pair of side edges to the other side edge,
The bag according to any one of the preceding claims, wherein the upper edge extends substantially parallel to the opening. A manufacturing method of a bag in which a storage portion to be filled with a fluid is formed,
The housing portion is defined along the lower edge and the pair of side edges of the bag inside a seal formed between the inner surface of the top film and the inner surface of the back film by heat welding.
The method of manufacturing the bag is
Preparing a laminated film comprising a thermoplastic resin layer constituting an inner surface and a substrate layer;
The laminated film is folded back to form a folded portion, and at least a portion of the surface film and at least a portion of the back film integrally configured with at least a portion of the surface film through the folded portion , To obtain a folding step,
Attaching a closing member to the inner surface of the surface film;
Forming the sealing portion to define the housing portion;
Among the front surface film and the back surface film on which the seal portion is formed, at least the front surface film is formed with an opening penetrating the front surface film,
The closing member is attached to the inner surface of the surface film so as to at least partially overlap the opening;
The closing member includes a first surface opposite to the surface film, and a second surface opposite to the first surface,
The first layer constituting the first surface of the closing member is at least partially made of a material that can be heat welded to the inner surface of the surface film,
The surface film includes at least a first portion and a second portion adjacent to each other across an opening penetrating the surface film,
The state in which the end of the first portion and the end of the second portion are opposed in the surface direction of the surface film, or the inner surface of the first portion is in contact with the outer surface of the second portion, or A method of manufacturing a bag, wherein an outer surface of a first portion and an inner surface of the second portion are in contact with each other. It is a bag in which the container is filled with the fluid,
At least a front film and a back film,
The outer edge of the bag includes an upper edge, a lower edge opposite the upper edge, and a pair of side edges extending between the upper edge and the lower edge,
The upper edge at least partially includes a folded portion formed by folding back a laminated film that constitutes at least a part of the front film and at least a part of the back film,
The front film and the back film are formed with an outlet through which fluid flowing along the folded portion of the upper edge is taken out.
The housing portion is defined inside a seal formed between the inner surface of the front film and the inner surface of the back film by heat welding along the lower edge and the pair of side edges of the bag.
The front film and the back film each include a base material layer, and a thermoplastic resin layer provided on the base material layer and constituting the inner surface of the front film.
Among the surface film and the back surface film, at least the surface film has an opening at a position inside the seal portion that defines the storage portion and below the outlet portion. Is formed,
In the opening, at least the base material layer is divided,
The bag further comprises a closing member attached to the inner surface of the face film so as to at least partially overlap the opening;
The closing member includes a first surface opposite to the surface film, and a second surface opposite to the first surface,
Between the first surface of the closing member and the inner surface of the surface film, a seal is at least partially formed by heat welding,
The opening portion may be formed by the seal portion between the first surface of the closing member and the inner surface of the surface film, or between the first surface of the closing member and the inner surface of the surface film. A bag enclosed by a combination of the seal between the seal and the inner surface of the face film and the inner surface of the back film. It is a manufacturing method of the bag by which the container was filled up with the fluid,
Preparing the bag according to claim 1;
Filling the fluid into the container through the opening;
Closing at least a part of the first surface of the closing member and the inner surface of the surface film by heat welding to form a seal portion;
In the closing step, the opening is formed by a seal formed by heat welding between the first surface of the closing member and the inner surface of the surface film, or the opening of the closing member A seal formed by heat welding between the first surface and the inner surface of the front film, and a heat welding between the inner surface of the front film and the inner surface of the back film A method of manufacturing a bag, wherein the method is implemented to be enclosed by a combination of seals. It is a manufacturing method of the bag by which the container was filled up with the fluid,
Preparing a bag having an opening formed therein;
Filling the fluid into the container through the opening;
Closing the opening.
The housing portion is defined along the lower edge and the pair of side edges of the bag inside a seal formed between the inner surface of the top film and the inner surface of the back film by heat welding.
The preparation process is
Preparing a laminated film comprising a thermoplastic resin layer constituting an inner surface and a substrate layer;
The laminated film is folded back to form a folded portion, and at least a portion of the surface film and at least a portion of the back film integrally configured with at least a portion of the surface film through the folded portion , To obtain a folding step,
Attaching a closing member to the inner surface of the surface film;
Forming the sealing portion to define the housing portion;
Among the front surface film and the back surface film on which the seal portion is formed, at least the front surface film is formed with an opening penetrating the front surface film,
The closing member is attached to the inner surface of the surface film so as to at least partially overlap the opening;
The closing member includes a first surface opposite to the surface film, and a second surface opposite to the first surface,
The first layer constituting the first surface of the closing member is at least partially made of a material that can be heat welded to the inner surface of the surface film,
In the closing step, the opening is formed by a seal formed by heat welding between the first surface of the closing member and the inner surface of the surface film, or the opening of the closing member A seal formed by heat welding between the first surface and the inner surface of the front film, and a heat welding between the inner surface of the front film and the inner surface of the back film A method of manufacturing a bag, wherein the method is implemented to be enclosed by a combination of seals. A manufacturing method of a bag in which a storage portion to be filled with a fluid is formed,
The housing portion is defined along the lower edge and the pair of side edges of the bag inside a seal formed between the inner surface of the top film and the inner surface of the back film by heat welding.
The method of manufacturing the bag is
Preparing a laminated film comprising a thermoplastic resin layer constituting an inner surface and a substrate layer;
The laminated film is folded back to form folded portions in two places, and at least a portion of the surface film and at least a portion of the back film integrally formed with at least a portion of the surface film through the folded portion. A step of obtaining a part;
Forming the sealing portion to define the housing portion;
One of the folded portions formed at two places of the laminated film constitutes an upper edge opposite to the lower edge of the bag,
The surface film includes at least a first portion and a second portion adjacent to each other across an opening penetrating the surface film,
The first portion and the second portion are in a contact state in which the inner surface of the first portion and the inner surface of the second portion partially contact, and the inner surface of the first portion and the inner surface of the second portion Are configured to be in an open state in which a gap is formed between the
The upper edge is configured to be inclined relative to the lower edge ,
The method for manufacturing a bag, wherein the folded portion extends from one to another of a pair of seal portions formed along the pair of side edges . It is a bag in which the container is filled with the fluid,
At least a front film and a back film,
The outer edge of the bag includes an upper edge, a lower edge opposite the upper edge, and a pair of side edges extending between the upper edge and the lower edge,
The upper edge at least partially includes a folded portion formed by folding back a laminated film that constitutes at least a part of the front film and at least a part of the back film,
The front film and the back film are formed with an outlet through which fluid flowing along the folded portion of the upper edge is taken out.
The front surface film and the back surface film each include a base material layer, and a thermoplastic resin layer provided on the base material layer and constituting the inner surface of the front surface film,
The surface film includes at least a first portion and a second portion adjacent to each other across the opening,
In the opening, at least the base material layer is divided,
A sealing seal is formed by thermal welding between the inner surface of the first portion and the inner surface of the second portion,
The upper edge is configured to be inclined relative to the lower edge ,
The folded portion extends from one side to the other of a pair of seal portions formed along the pair of side edges . It is a manufacturing method of the bag by which the container was filled up with the fluid,
Preparing the bag according to claim 3;
Filling the fluid into the container through the opening;
And b) closing the inner surface of the first portion of the surface film and the inner surface of the second portion to form a closing seal. It is a manufacturing method of the bag by which the container was filled up with the fluid,
Preparing a bag having an opening formed therein;
Filling the fluid into the container through the opening;
Closing the opening.
The outer edge of the bag includes an upper edge, a lower edge opposite the upper edge, and a pair of side edges extending between the upper edge and the lower edge,
The upper edge is configured to be inclined relative to the lower edge,
The housing portion is defined along the lower edge and the pair of side edges of the bag inside a seal formed between the inner surface of the top film and the inner surface of the back film by heat welding.
The preparation process is
Preparing a laminated film comprising a thermoplastic resin layer constituting an inner surface and a substrate layer;
The laminated film is folded back to form a folded portion, and at least a portion of the surface film and at least a portion of the back film integrally configured with at least a portion of the surface film through the folded portion , To obtain a folding step,
Forming the sealing portion to define the housing portion;
The surface film includes at least a first portion and a second portion adjacent to each other across an opening penetrating the surface film,
In the closing step, a closing seal portion is formed by heat-welding the inner surface of the first portion of the surface film and the inner surface of the second portion ,
The method for manufacturing a bag, wherein the folded portion extends from one to another of a pair of seal portions formed along the pair of side edges .

Images