JP6531407B2 - A bag in which a container into which contents are to be filled is formed and a method of manufacturing the same, and a bag in which the container is filled with contents 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 formed with a container into which contents are filled and a method of manufacturing the same. The present invention also relates to a bag whose content is filled in the container and a method of manufacturing the same.

  A bag made of a soft packaging material is used as a bag for containing a fluid containing a fluid such as liquid or powder and a content including a solid such as confectionery. In general, a bag for containing contents is heat-sealed together with a front film and a back film, the inner surface of which is formed of a thermoplastic resin layer, to form a seal portion such as a side edge seal portion or a lower edge seal portion. It is obtained by At this time, normally, the top film and the back film are not heat-welded at the top of the bag, thereby forming an opening at the top of the bag. The contents are then filled into the interior of the bag through this 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 contents is obtained (see, for example, Patent Document 1).

Patent No. 4659963 gazette

  At the top of the bag, various additional shapes may be provided or additional members may be attached to improve the handling of the bag, the removal of contents, and the like. For example, in patent document 1, the through-hole for inserting a finger in the upper part of a bag is provided. Also, if the contents are fluid, a spout for removing the fluid may be attached to the top of the bag, or an outlet for removing the fluid may be formed at the top of the bag. If such an additional shape is present during the filling process, the width of the opening formed at the top of the bag for the filling of the contents is reduced by the width occupied by the additional shape. Also, in the case of attaching an additional member after the filling process, it is necessary to be careful not to leak the contents during the attaching process, which makes the attaching process complicated and difficult. In this way, in the method of filling the contents using the upper opening and heat welding the opening after filling to form the upper edge seal, the filling step and the subsequent steps have various limitations. I will receive.

  In order to solve such problems, an opening is formed in the lower portion of the bag, the opening is used to fill the contents, and the opening is heat-welded to form the lower edge seal after filling is completed. It is also conceivable to use this method. However, if the top film and the back film are heat-welded to each other at the lower part of the bag to close the opening, no gusset can be provided at the lower part of the bag, and hence the self-standing as described in Patent Document 1 It is not possible to form a possible bag. Thus, in the method of providing an opening at the bottom, the type of bag is limited.

  The present invention has been made in consideration of these points, and it is an object of the present invention to provide a method for producing a bag which is excellent in the filling ability of the contents and can correspond to various types of bags. Do.

  The present invention is a bag having a container filled with contents and at least comprising a front film and a back film, wherein the housing is heat along the outer edge of the front film and the outer edge of the back film. It is defined inside the seal formed at least partially between the inner surface of the front film and the inner surface of the back film by welding, and at least the front film of the front film and the back film, The opening through the surface film is at least partially formed at a position inside the seal defining the housing, and the bag is at least partially overlapped with the opening. And a closing member attached to the inner surface of the surface film, the closing member having a first surface facing the surface film And a second layer opposite to the first surface, the first layer constituting the first surface of the closing member being at least partially heat welded to the inner surface of the surface film It is a bag, which is made of the material obtained.

  In the bag according to the present invention, in which the container filled with contents is formed, the second layer constituting the second surface of the closing member is made of the material constituting the first layer of the closing member. It may also be constituted by a material having a high melting point. Alternatively or additionally, 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. .

  In the bag according to the present invention, in which the container is filled with contents, the seal portion includes a pair of side edge seal portions extending along a pair of side edges of the bag; It may further include a chuck tape attached to the inner surface of the surface film and extending from one side edge seal portion of the pair of side edge seal portions to the other side edge seal portion.

  In the bag according to the present invention, in which the container filled with the content is formed, the content filled in the container is a fluid having fluidity, and the bag pours out the fluid. It may further be equipped with a spout for

  In the bag according to the present invention, in which the container is filled with contents, the seal includes a pair of side edge seal portions extending along a pair of side edges of the bag, and the bag is opened. The portion to be opened that is to be taken out is formed, and the width of the portion to be opened may be smaller than the distance between the pair of side edge seal portions of the bag.

  In the bag according to the present invention, in which the container is filled with contents, the seal includes an upper edge seal extending along the upper edge of the bag, and the upper edge seal has a through hole May be formed.

  The bag may further include a lower film inserted between the front film and the rear film to form a lower portion of the bag. The lower surface film may be folded back such that the folded back portion is convex toward the accommodation portion.

  The present invention is a method for producing a bag having a container filled with contents, which comprises the steps of preparing a front film and a back film, attaching a closing member to the inner surface of the front film, and A seal is formed at least partially between the inner surface of the front film and the inner surface of the back film by heat welding along the outer edge of the front film and the outer edge of the back film, and the receiving portion is inside the seal. And forming an opening through the surface film in at least the surface film of the surface film and the back surface film in which the opening portion in which the seal portion is formed is formed. The closure member is 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, and the first layer constituting the first surface of the closing member 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 storage portion is filled with contents, which comprises at least a front film and a back film, wherein the storage portion is formed by heat welding along the outer edge of the front film and the outer edge of the back film. The surface film and the back film are each defined on the inside of a seal formed between the inner surface of the front film and the inner surface of the back film, and the front film and the back film are each formed on a base layer and the base layer. And the thermoplastic resin layer forming the inner surface of the front surface film, and at least the front surface film of the front surface film and the back surface film, the sealing portion defining the housing portion An opening is formed at an inner position, and at least the base material layer is divided in the opening, and the bag is opened. And a closing member attached to the inner surface of the surface film so as to at least partially overlap the portion, the closing member having a first surface facing the surface film and an opposite side of the first surface A sealing portion is formed at least partially by thermal welding between the first surface of the closing member and the inner surface of the surface film, the second surface being positioned; The portion is formed by the seal 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. It is a bag enclosed by the combination of the said seal part of the said seal part and the said inner surface of the said surface film, and the said inner surface of the said back surface film.

  The present invention is a manufacturing method of a bag in which a container is filled with contents, and the step of preparing the bag described above, and the filling step of filling the container into the contents 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, wherein the opening step includes the opening portion The 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 of the closing member and the inner surface of the surface film Surrounded by a combination of a seal formed by heat welding between the two and a seal formed by heat welding between the inner surface of the front film and the inner surface of the back film. It is carried out, a method of manufacturing a bag.

  In the bag according to the present invention, at least the surface film has an opening passing through the surface film at least partially formed at a position inside the seal portion defining the housing portion. For this reason, the content can be filled in the storage part of a bag through the opening part 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. Therefore, 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 contents are filled in the storage portion of the bag. Therefore, even when additional shapes and members are provided at the upper and lower portions of the bag, the width of the opening at the time of filling can be secured wide. As a result, it is possible to provide a bag which is excellent in the filling ability of the contents and which can correspond to various types.

FIG. 1 is a perspective view showing a bag according to an 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 (a) and (b) is a figure which shows the process of attaching the film for closing to the 1st part of surface film. FIG. 7 is a cross-sectional view showing the process of attaching the closing film to the first portion of the surface film. FIG. 8 (a) is a view showing a process of combining the first portion of the front film to which the closing film is attached and the second portion of the front film, and FIG. 8 (b) is a front film, back film and lower surface. The figure which shows the process of forming an accommodating part by heat-welding a film. FIG. 9 is a cross-sectional view showing the closing film attached to the surface film so as to overlap the opening. Fig.10 (a) is a figure which shows the filling process which fills a storage part with a content via an opening part, FIG.10 (b) is a figure which shows the closing process which closes an opening using a closing film. FIG. 11 is a cross-sectional view showing the bag with the opening closed by the closing film. FIG. 12 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. 13A is a cross-sectional view of a variation of the bag with the opening prior to being closed by the closing film. FIG. 13B is a cross-sectional view showing a state in which the opening of the bag shown in FIG. 13A is closed by a closing film. FIG. 14A is a cross-sectional view of a variation of the bag with the opening prior to being closed by the closing film. FIG. 14B is a cross-sectional view showing a state in which the opening of the bag shown in FIG. 14A is closed by a closing film. FIG. 15: is a front view which shows one modification of the opening part formed in the surface film of a bag. FIG. 16 is a front view showing a modified example of the opening formed in the surface film of the bag. FIG. 17: is a front view which shows one modification of the opening part formed in the surface film of a bag. FIG. 18 is a front view showing a modified example of the opening formed in the surface film of the bag. FIG. 19 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. 20A is an enlarged view of a part surrounded by a frame XX in FIG. 19; FIG. 20B is a view showing a state in which the opening of the bag shown in FIG. 20A is closed by a closing film. FIG. 21A 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. 21B is a view showing a state in which the opening of the bag shown in FIG. 21A is closed by a closing film. FIG. 22A 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. 22B shows the bag shown in FIG. 22A closed with a closing film. FIG. 23A is a front view showing a modified example of the opening formed in the surface film of the bag. FIG. 23B is a view showing the opening of the bag shown in FIG. 23A closed by a closing film. FIG. 24A is a front view showing a modified example of the opening formed on the surface film of the bag and the closing film. FIG. 24B is a view showing the opening of the bag shown in FIG. 24A closed by a closing film. FIG. 25A is a front view showing a modified example of the opening formed in the surface film of the bag and the closing film. FIG. 25B is a view showing an example in which the opening of the bag shown in FIG. 25A is closed by the closing film. FIG. 25C is a view showing another example in which the opening of the bag shown in FIG. 25A is closed by the closing film. FIG. 26A is a front view showing an example of a bag further provided with a chuck tape. FIG. 26B is a cross-sectional view showing the bag shown in FIG. 26A taken along line XXVIB-XXVIB. FIG. 27 (a) shows a filling step of filling the container with the contents through the opening of the bag shown in FIG. 26A. FIG. 27 (b) closes the opening using a closing film. FIG. 27 (c) is a diagram showing a closing step, and FIG. FIG. 28A 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. 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. 29 is a front view showing an example of a bag further provided with a spout. FIG. 30: is a front view which shows an example of the bag by which the width | variety of the opening plan part was narrowed. FIG. 31 is a front view showing another example of the bag in which the width of the portion to be opened is narrowed. FIG. 32 is a front view showing an example in which the bag shown in FIG. 31 further includes a chuck tape. FIG. 33 is a front view showing a bag in which a through hole is formed in the upper edge seal portion. FIG. 34: is a front view which shows an example of the bag in which the back seal part was formed. FIG. 35 is a diagram showing an example in which the first portion of the front film and the back film are integrally formed. FIG. 36 is a front view showing a bag formed by using the front and back films shown in FIG. 35. FIG. 37 is a diagram showing an example in which a front film, a back film and a lower film are integrally formed.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 11. 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 present embodiment, and FIG. 2A is a front view showing the entire bag 1 according to the present embodiment. In FIGS. 1 and 2A, the bag 1 is shown in a state before the contents are filled.

  In the present 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 the present specification, the terms "lower part", "upper part" and "side part", and the terms "vertical direction" and "horizontal direction" refer to the bag 1 or the like based on the bag 1 being in a self-standing state. It represents the position and direction of the component. 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. Between the inner surface of the front film 11 and the inner surface of the back film 12, a seal is formed by heat welding along the outer edge of the front film 11 and the outer edge of the back film 12. Inside the seal portion, a storage portion S in which the content is filled is defined. In the present embodiment, the outer edge of the surface film 11 and the outer edge of the back film 12 respectively include an upper edge 21 and a lower edge 23 and a pair of side edges 22 extending between the upper edge 21 and the lower edge 23. It is. Further, the seal portion which defines the accommodation portion S in which the contents are filled includes an upper edge seal portion 21a formed along the upper edge 21 and a lower edge seal portion 23a formed along the lower edge 23. And a pair of side edge seal portions 22 a formed along the pair of side edges 22. 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.

  Moreover, the seal part which defines the containing part S in which the content is filled 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.

  The contents to be filled in the bag 1 are not particularly limited as long as they can pass through the openings 15 described later. For example, as the contents to be filled in the bag 1, for example, a liquid such as liquid detergent or shampoo, or a fluid having fluidity such as powder or granules can be mentioned. Besides, as an example of the contents to be filled in the bag 1, solid substances such as confectionery can be mentioned.

  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 present 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 inner surface of the front film 11. It is constituted by the closing film 40 attached. 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 present 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.

  The lower surface film 13 is inserted between the surface film 11 and the rear surface film 12 in a state where the folded portion 13 c is folded back so as to be convex toward the inner side (the accommodation portion S side) of the bag 1. 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 11x, 12x and 13x denote the inner surfaces of the front film 11, the back film 12 and the lower film 13, respectively. Moreover, the codes | symbols 11y, 12y, and 13y represent the outer surface of the surface film 11, the back film 12, and the lower surface film 13, respectively. In addition, in this specification, an "inner surface" is a surface of the side which faces the accommodating part S with which a content 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 present 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 21a, 22a, 23a that define the housing portion S. At least partially formed in the position of. In the bag 1 in a state before the storage portion S is filled with the contents, 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 in which the sealing portion is formed to close the opening 15 after the storage portion S is filled with the contents, 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 content passes when the storage portion S is filled with the content, as described later. The dimensions of the opening 15 at the inside of the sealing portions 21a, 22a, 23a are preferably set wider so that the contents can be efficiently filled. 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 21a, 22a and 23a but also to the inside of the seal portions 21a, 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 storage portion S can be filled with the contents 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 seal 21a toward the lower edge seal 22a. Also in this case, by providing the closing film 40 so as to overlap the opening 15, the filling step of the contents and the closing step after the filling step can be easily performed.

  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 opening portions 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 contents into the first accommodation portion and the second accommodation portion through the opening 15 respectively.

  The top film 11 and the back film 12 are not particularly distinguished by the printing applied to the outer surface. 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 the content is filled into the storage portion 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.

  In addition, 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 content is filled in the storage portion S, 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. In addition, in the bag 1 in a state before the storage portion S is filled with contents, as long as the closing film 40 can at least partially overlap the opening 15 after the storage portion S is filled with contents. The closing film 40 does not necessarily have to overlap the opening 15. For example, in the bag 1 in a state before the storage portion S is filled with the contents, the closing film 40 is folded, so the closing film 40 may not overlap the opening 15. In this case, when the opening portion 15 is closed after the storage portion S is filled with the contents, the closing film 40 is made to overlap the opening portion 15 by spreading the folded closing film 40.

(Seal part)
Next, the upper edge seal portion 21a, 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 upper edge seal portion 21 a and the side edge seal portion 22 a are seal portions formed by heat welding the inner surface 11 x of the front film 11 and the inner surface 12 x of the back 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 the present specification, for convenience of explanation, a seal portion obtained by heat-welding the inner surface 11x of the surface film 11 and the inner surface 12x of the back film 12, such as the upper edge seal portion 21a and the side edge seal portion 22a. May be referred to as a first type seal portion 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. 9, 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.

(Part to be opened)
The front film 11 and the back film 12 of the bag 1 may be provided with easy opening means for facilitating breaking the bag 1 and opening the bag 1. For example, as shown in FIG. 2A, the side edge seal portion 22a of the bag 1 may be formed with a notch 25 as a starting point of breakage. Moreover, the half cut line formed by laser processing, a cutter, etc. may be provided in the part used as the path | route at the time of tearing the bag 1 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. In FIG. 2A, by breaking the bag 1 starting from the notch 25, a portion (hereinafter, also referred to as a portion to be opened) which is an outlet for taking out the contents is represented by reference numeral 25a. Preferably, the portion to be opened 25 a is formed so as not to overlap with the closing film 40.

  Although not shown, in place of the notches 25, cuts or scars may be formed on the surface film 11 and / or the back film 12. 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 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 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 front film 11, the back film 12, and the lower film 13 include a base layer 52 and a thermoplastic resin layer 51 provided on the base layer 52. In the example shown in FIG. 4, the base material layer 52 constitutes the outer surfaces 11 y, 12 y, 13 y of the films 11, 12, 13 and the thermoplastic resin layer 51 is the inner surface of the films 11, 12, 13. It constitutes 11x, 12x and 13x. The base layer 52 may be subjected to printing such as design.

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 11y, 12y, 13y. 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 11, 12, 13 is, for example, in the range of 20 to 250 μm.

  Although not shown, the films 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 high gas barrier properties such as ethylene-vinyl alcohol copolymer (EVOH), polyvinylidene chloride resin (PVDC), or aliphatic 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 front film 11, the back film 12 and the lower film 13, aliphatic polyamides such as ethylene-vinyl alcohol copolymer (EVOH), polyvinylidene chloride resin (PVDC), nylon MXD6, etc. 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 present embodiment will be described.

(Step 1)
First, an example of the process of preparing the raw fabric of the laminated film for the surface film 11 and the back film 12 is demonstrated. First, a raw material of one base material layer is prepared. Here, the raw material means a rolled film. Next, you may print on one side of the film of the elongate base material layer unwound from one raw fabric. For example, the printing of the pattern for the surface film 11 is repeatedly applied to one side of the film of the elongated base layer, and the other side of the film of the elongated base layer is Printing of a pattern for the back film 12 may be repeated. In addition, a pattern is for showing a product display etc., and it is a concept including not only an image but a character, a number, a symbol, a figure, etc. Next, the thermoplastic resin layer is laminated on the film of the long base material layer using a dry lamination method or a melt extrusion lamination method to prepare a long laminated film. In this way, a raw film of laminated films for the front film 11 and the back film 12 is obtained.

(Step 2)
Thereafter, a raw material of laminated film is prepared. In addition, the raw fabric of the lower surface film 13 and the raw fabric of the film 40 for closing may also be prepared in the manufacturing apparatus with which the raw fabric of the laminated film was prepared. Next, the laminated film is unwound from the raw material of the laminated film. Then, using a cutter blade or the like provided so as to extend along the transport direction of the long laminate film, the long laminate film is cut into two parts while being continuously transported. By this, the long surface film 11 and the back film 12 can be obtained. The pattern may be printed on the laminated film without being applied in the form of a film of the base layer.

(Third step)
Next, using a cutter blade or the like provided so as to extend along the transport direction of the elongated surface film 11, the elongated surface film 11 is continuously transported to the two portions while the surface film 11 is transported continuously. To obtain elongated first portions 11a and second portions 11b. In addition, as a cutter blade which cut | disconnects the elongate surface film 11, one cutter blade may be used, or predetermined intervals are opened in the direction orthogonal to the conveyance direction of the elongate surface film 11. Alternatively, two cutter blades may be used. When cutting the surface film 11 using a single cutter blade, when forming the surface film 11 by combining the first portion 11a and the second portion 11b, as shown in FIG. 2B described above, the first portion 11a The end 11ae of the second portion 11b and the end 11be of the second portion 11b are in contact with or in close proximity to each other. On the other hand, when the surface film 11 is cut using two cutter blades, when the surface film 11 is configured by combining the first portion 11a and the second portion 11b, the end portion 11ae of the first portion 11a and the second portion A predetermined spacing will be present between the end 11be of the portion 11b.
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 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.

  In the above-mentioned process, printing is performed on the film or the laminated film of the base material layer unwound from one raw fabric, and then the laminated film is cut to obtain an example of obtaining the front film 11 and the back film 12 The However, the present invention is not limited to this, and the top film 11 and the back film 12 may be separately prepared. For example, the raw fabric on which the surface film 11 is wound and the raw fabric on which the back film 12 is wound may be separately prepared. Similarly, for the first portion 11a and the second portion 11b of the surface film 11, the raw fabric on which the first portion 11a is wound and the raw fabric on which the second portion 11b is wound may be separately prepared. .

  Thereafter, the front film 11, the back film 12, and the lower film 13 and the closing film 40 described above including the first portion 11a and the second portion 11b are bonded to each other by heat welding or the like. Thus, the bag 1 is manufactured. At this time, the step of bonding the respective films 11, 12, 13, 40 may be carried out with the respective films 11, 12, 13, 40 in a long state, or the respective films 11, 12, 13, 40 may be implemented in the state cut to the dimensions of the bag 1. Here, an example in which the respective films 11, 12, 13, 40 are joined by heat welding in a state where the respective films 11, 12, 13, 40 are long will be described below. In FIGS. 6 (a) and 6 (b) and FIGS. 8 (a) and 8 (b), only the region corresponding to the size of one bag 1 of the elongated films 11, 12, 13, 40 is shown. It is shown. In addition, the above-described second step of dividing one laminated film to obtain front film 11 and back film 12, or the above-described third step of dividing one front film 11 to obtain first portion 11a and second portion 11b. Also about a process, a laminated film may be implemented in the long state, or it may be implemented in the state which cut | disconnected the laminated film according to the dimension of the bag 1. FIG.

(Step 4)
First, the step of attaching the closing film 40 to the inner surface 11x of the surface film 11 is performed. First, the above-described elongated first portion 11 a and the elongated closing film 40 unrolled from the material of the closing film 40 are prepared. Next, as shown in FIG. 6A, the first portion 11a and the closing film 40 are disposed such that the end 11ae of the elongated first portion 11a overlaps the long closing film 40. . Thereafter, 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 first portion 11a. FIG. 7 is a view showing how the closing film 40 and the first portion 11a are thermally welded using a pair of heat plates 61 for heating and pressing the first portion 11a and the closing film 40. As shown in FIG. As shown in FIGS. 6 (b) and 7, the mounting seal portion 41 is formed to extend along the end portion 11ae of the first portion 11a. Preferably, the temperature of the heat plate 61 is higher than the melting point of the material forming the thermoplastic resin layer 51 of the first portion 11 a and the material forming the first layer 56 of the closing film 40, but the closing film 40 is Is controlled to be lower than the melting point of the material constituting the second layer 57 of By this, it is possible to prevent the second layer 57 of the closing film 40 from melting at the time of heat welding, whereby the second layer 57 of the closing film 40 adheres to the heat plate 61. You can prevent it from

  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.

(Step 5)
Next, the above-mentioned seal portions 21a, 22a, 23a between the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12 at least partially by heat welding along the outer edge of the front film 11 and the outer edge of the back film 12. And the step of defining the housing portion S inside the seal portions 21a, 22a, 23a. First, as shown in FIG. 8A, the long surface film 11 is formed by combining the first portion 11a to which the long closing film 40 is attached and the long second portion 11b. Configure. At this time, a portion including the end 11 ae of the first portion 11 a and the end 11 be of the second portion 11 b is the opening 15. Although not shown, the front film 11 and the back film 12 are superimposed so that the inner surface 11x of the long front film 11 and the inner surface 12x of the long back film 12 face each other. In addition, between the elongated front film 11 and the elongated back film 12, the elongated lower film 13 unwound from the raw fabric of the lower film 13 and bent along the folded portion 13c is insert.
Thereafter, as shown in FIG. 8B, the long films 11, 12, 13 are heat-welded along the upper edge 21, the side edge 22 and the lower edge 23 of the bag 1, respectively. An upper edge seal portion 21a, a lower edge seal portion 23a, and a pair of side edge seal portions 22a are formed.

(Step 6)
Next, the elongated films 11, 12, 13, 40 thermally welded to one another are divided along the shape of the outer edge of the bag 1 to accommodate the inside of the sealed portions 21a, 22a, 23a. The bag 1 in which S is defined can be obtained.

Note that any of the above-described second to sixth steps may be performed inline. That is, the second to sixth steps may be carried out continuously without winding each film halfway. Moreover, after implementing the above-mentioned 2nd process, you may each wind up the elongate surface film 11 and the elongate back film 12 once. Moreover, after implementing the above-mentioned 3rd process, you may each temporarily wind up the elongate 1st part 11a and the elongate 2nd part 11b. Moreover, after implementing the above-mentioned 4th process, you may wind up the elongate 1st part 11a to which the elongate closing film 40 was attached. In addition, the fourth and fifth steps described above may be performed simultaneously.
Further, instead of dividing one laminated film to obtain the front film 11 and the back film 12 as in the above-described second step, the front film 11 and the back film 12 may be separately prepared. For example, the raw fabric on which the surface film 11 is wound and the raw fabric on which the back film 12 is wound may be separately prepared. Likewise, in the third step, the raw fabric on which the first portion 11a is wound and the raw fabric on which the second portion 11b is wound may be separately prepared.
Further, as exemplified in FIG. 35 described later, in the case where the first portion 11a of the front surface film 11 and the back surface film 12 are configured by folding back one laminated film, the above-mentioned second step is a dividing step Instead, it may include the step of forming a first portion 11 a of the surface film 11 and the back film 12 by folding one laminated film.
In addition, after one laminated film is divided into two laminated films at a portion corresponding to the opening 15, one of the two laminated films is further divided to form a long first portion 11a, which is long. You may obtain the measurement-like 2nd part 11b and the elongate back film 12. As shown in FIG. That is, the above-mentioned third step may be performed first, and then the second step may be performed.
As exemplified in FIG. 15 described later, in the case where the opening 15 is formed so as not to overlap the pair of side edge seal portions 22a, the third step described above is a step of dividing the laminated film instead of the step of dividing the laminated film The laminated film may be intermittently slitted to form the openings 15 intermittently along the longitudinal direction of the long laminated film. "Intermittently" means that two adjacent openings 15 are not connected to each other. Preferably, the step of intermittently slitting the laminated film to form the opening 15 is preferably performed after the step of dividing or folding the laminated film to form the surface film 11 and the back film 12. To be implemented. This is because, when forming the front film 11 and the back film 12 by dividing or folding the laminated film after slitting, the opening 15 formed by the slitting is used as a starting point at the time of dividing or folding. This is because it is conceivable that the laminated film may be torn or the accuracy of the position of folding of the laminated film may be reduced.

  FIG. 9 is a cross-sectional view showing the bag 1 shown in FIG. 8 (b) along the line IX-IX, in which the closing film 40 is interposed between the front film 11 and the back film 12. It is sectional drawing which shows an example of the side edge seal part 22a formed in the part which exists. As described above, when the closing film 40 extends from one side edge 22 to the other side edge 22 of the bag 1, as shown in FIG. 9, the inner surface 11x of the front film 11 and the inner surface 12x 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. 9, 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 the contents)
Next, a method of manufacturing the bag 1 in which the content is filled in the storage part S and the content is filled in the bag 1 will be described.

  First, the filling step of filling the storage portion S with the contents through the opening 15 will be described. First, as shown in FIG. 10A, the bag 1 held so that the lower edge 23 is positioned downward is prepared. 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, contents such as a fluid are 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. 10 (b) and FIG. 11, the closing seal portion formed as the third type sealing portion R3 by thermally welding the first surface 40 x of the closing film 40 and the inner surface 11 x of the surface film 11 It is represented by 42. FIG. 11 is a cross-sectional view showing the bag in a state in which the closing portion 15 is closed by the closing film 40, and a cross-sectional view showing a case where the bag 1 shown in FIG. 10 (b) is viewed along line XI-XI. It is.

  In the example shown in FIGS. 10 (b) and 11, the closing seal 42 is formed so as 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 bag 1 filled with contents 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 contents, 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 addition, in FIG. 11, the example in which the sealing part 42 for closures is formed so that the opening part 15 may be overlapped was shown. 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. 12, a pair of closing seals 42 may be formed to face each other with the opening 15 interposed therebetween. 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 present embodiment, at least the surface film 11 has the opening 15 penetrating the surface film 11 at a position inside the seal portions 21a, 22a and 23a defining the housing portion S. At least partially formed. For this reason, the content can be filled in the storage portion S of the bag 1 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 content is filled in the storage portion S of the bag 1 it can. Therefore, even when additional shapes and members are provided at the upper and lower portions of the bag 1, the width of the opening at the time of filling can be secured wide. As a result, it is possible to provide the bag 1 which is excellent in the filling ability of the contents and which can correspond to various types.

  Note that various modifications can be made to the embodiment described above. Hereinafter, modifications will be described with reference to the drawings as needed. In the following description and the drawings used in the following description, with respect to parts that can be configured in the same manner as the above-described embodiment, the same reference numerals as those used for the corresponding parts in the above-described embodiment are used. Duplicate descriptions will be omitted. In addition, in the case where it is clear that the effects and advantages obtained in the above-described embodiment 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. 13A to 18.

  In the embodiment described above, an example is shown 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. The However, the present invention is not limited to this, as shown in FIGS. 13A and 13B, 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. 13A 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. 13B is a film for closing the opening 15 of the bag 1 shown in FIG. 13A. 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 is not particularly limited, but is preferably in the range of 0 to 10 mm, more preferably in the range of 1 to 7 mm It is set within.

  In addition, as shown in FIGS. 14A and 14B, 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. 14A 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. 14B is a film for closing the opening 15 of the bag 1 shown in FIG. 14A. 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. 14A, the content is filled into 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. 14A, 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. 14B, 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.

  Moreover, in the above-mentioned this embodiment, the example which the opening part 15 was extended from the one side edge seal part 22a to the other side edge seal part 22a was shown. However, the present invention is not limited to this, and as shown in FIG. 15, 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 contents 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 the content is filled in the storage portion S of the bag 1 . According to this modification, the sealing performance of the bag 1 after closing the opening 15 using the closing film 40 can be improved by preventing the opening 15 from reaching the side edge seal portion 22 a.

  Moreover, in the above-mentioned this Embodiment, the example which the opening part 15 was extended linearly was shown 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. 16, 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 aptitude of the contents can be further enhanced. As shown in FIG. 17, the opening 15 has a portion curved so as to be convex from the lower portion to the upper portion of the bag 1 and a portion curved to be convex from the upper portion to the lower portion of the bag 1 And may be present repeatedly.

  Moreover, in the above-mentioned this 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. 18, 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 easily 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. In addition, 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 during manufacturing or transportation of the bag 1 before the contents are filled, thereby opening the opening 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 contents are filled can be improved.

  In the examples shown in FIGS. 15 to 18 described above, the bag 1 is shown in a state before the storage portion S is filled with the contents.

(Modification of film for closing)
Hereinafter, several modifications of the closing film 40 will be described with reference to FIGS. 19 to 22B.

  In the above-described present embodiment, 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 to this, and as shown in FIG. 19, 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. 19, the bag 1 in the state before the storage part S is filled with the content is shown. FIG. 20A is an enlarged view of a portion surrounded by a frame XX in FIG. FIG. 20B is a view showing a state in which the opening 15 of the bag 1 shown in FIG. 20A 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. 20A, 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. Therefore, the side edge seal portion 22a can include a first type seal portion R1 continuous from the upper edge seal portion 21a to the lower edge seal portion 23a, whereby the bag 1 can be more firmly sealed. it can. FIG. 20A 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. 21A and 21B, the closing film 40 may be configured not to reach the side edge seal portion 22a. FIG. 21A 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. 21B is a film for closing the opening 15 of the bag 1 shown in FIG. 21A. 40 is a cross-sectional view showing a state closed by 40. FIG.

  As shown in FIG. 21A, if there is a portion where the closing film 40 and the opening 15 do not overlap at a position inside the seal portions 21a, 22a, 23a that define the accommodating portion S, the opening The opening 15 can not be completely closed only by the mounting seal portion 41 and the closing seal portion 42 which are formed by heat welding between the sealing film 15 and the closing film 40. In this case, as shown in FIG. 21B, 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 completely closed. In the example shown in FIG. 21B, 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. 22A and FIG. 22B, the some through-hole 43 may be formed in the film 40 for closing. 22A 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. 22B is a film for closing the opening 15 of the bag 1 shown in FIG. 22A. 40 is a cross-sectional view showing a state closed by 40. FIG.

  22A and 22B, 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 of the closing film 40 overlapping the side edge seal portion 22a but also at a position inside the seal portions 21a, 22a, and 23a. In addition, one through hole 43 may be formed.

(Modified example of combination of closing film and opening)
Hereinafter, with reference to FIGS. 23A to 25C, several modified examples regarding the combination of the closing film 40 and the opening 15 will be described. In each modification shown in FIGS. 23A to 25C, the opening 15 is configured not to reach the side edge seal portion 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. 23A and 23B, the closing film 40 is configured to extend from one side edge 22 of the bag 1 to the other side edge 22. FIG. 23A 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. 23B is a film for closing the opening 15 of the bag 1 shown in FIG. 40 is a cross-sectional view showing a state closed by 40. FIG. In this modification, as shown in FIG. 24B, the accommodating portion of the bag 1 is formed by forming the closing seal portion 42 so that the opening 15 is sandwiched between the mounting seal portion 41 and the closing seal portion 42. After filling the contents 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. 24A and 24B, the closing film 40 is configured to reach the pair of side edge seal portions 22 a but not to reach the pair of side edges 22. FIG. 24A 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. 24B shows the opening 15 of the bag 1 shown in FIG. 40 is a cross-sectional view showing a state closed by 40. FIG. Also in this modification, as in the case shown in FIGS. 23A and 23B 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 storage portion S of the bag 1 is filled with the contents (see FIG. 24B), the opening film 15 can be used to close the opening 15.

  In the example shown in FIGS. 25A and 25B, the closing film 40 is configured not to reach the side edge seal portion 22a. FIG. 25A 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. 25B shows 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. 25C is a cross-sectional view showing another example of the state where the opening 15 of the bag 1 shown in FIG. 25A is closed by the closing film 40.

  In the example shown in FIG. 25B, 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 15 and the third type sealing portion R3. 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. 25B, 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. 25C, 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. 25C, 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.

(Example where a zipper tape is provided)
As shown in FIG. 26A, the bag 1 is attached to at least the inner surface 11x of the surface film 11 and is a chuck tape 45 extending from one side edge seal 22a of the pair of side edge seal 22a to the other side edge seal 22a. May be further provided. The chuck tape 45 is a member provided to re-seal the main body 2 of the bag 1 after being broken and opened along the easy opening means such as the notch 25. FIG. 26A shows the bag with the opening 15 in the state before being closed by the closing film 40.

  FIG. 26B is a cross-sectional view showing the bag 1 shown in FIG. 26A as viewed along the line XXVIB-XXVIB. As shown in FIG. 26B, the chuck tape 45 is a female member 47 provided on the inner surface 11x side of the surface film 11, and a male member attached to the inner surface 12x of the back film 12 so as to face the female member 47. 46, and. In FIG. 26B, an example is shown in which the female member 47 is provided on the closing film 40 attached to the inner surface 11x of the surface film 11. For example, the female member 47 may be configured integrally with the first layer 56 or the second layer 57 of the closing film 40. Although not shown, the female member 47 may be attached to the inner surface 11 x of the surface film 11 without the film 40 for closing.

  The male member 46 and the female member 47 are configured to be engageable with each other. In this case, by fitting the male member 46 and the female member 47, the storage portion S of the bag 1 after opening can be sealed again. Further, the contents in the housing portion S can be taken out by removing the fitting between the male member 46 and the female member 47. Although not shown, the male member 46 may be attached to the surface film 11 and the female member 47 may be attached to the back film 12.

  As shown in FIG. 26B, the inner surface 11x of the surface film 11 and the inner surface 12x of the back film 12 can be joined to the portion of the inside of the bag 1 below the chuck tape 45 as required. Peeling means 48 may be provided. By bonding the surface film 11 and the back film 12 on the lower side than the chuck tape 45, the contents can be inhibited from contacting the chuck tape 45. As a result, for example, the sealing performance of the chuck tape 45 can be suppressed from being insufficient due to the presence of contents between the male member 46 and the female member 47. Further, by providing the easy peeling means 48, it is possible to more reliably suppress the contents from reaching the periphery of the easy opening means such as the notch 25 beyond the chuck tape 45. Thereby, when the user opens the bag 1, the contents can be prevented from adhering to the user's hand. The specific configuration of the easy peel means 48 is not particularly limited, and any known one may be used as appropriate. For example, as shown in FIG. 26B, the easy peel means 48 includes an easy peel film 49 attached to the inner surface 12x of the back film 12 so as to face the closing film 40 attached to the inner surface 11x of the front film 11. It may be The easy peel film 49 may be attached not to the inner surface 12 x of the back film 12 but to the second surface 40 y of the closing film 40.

  The method for filling the contents into the bag 1 shown in FIG. 26A will be described with reference to FIGS. 27 (a) and 27 (b). First, as shown in FIG. 27A, in a state where the easy peel film 49 attached to the inner surface 12x of the back surface film 12 is joined to the closing film 40, the second portion 11b is first Pull away from the part 11a. Then, the filling step of filling the contents into the storage portion S of the bag 1 through the opening 15 is performed. Next, as shown in FIG. 27 (b), a closing step is performed in which 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 the closing seal portion 42. Do. As a result, it is possible to obtain the bag 1 in which the storage portion S is filled with contents and the opening 15 is closed.

  FIG. 27C is a view showing a state in which the male member 46 and the female member 47 are disengaged in order to take out the contents in the storage portion S. In the example shown in FIG. 27C, in the easy peel film 49, the adhesion between the easy peel film 49 and the inner surface 12x of the back film 12 is the easy peel film 49 and the second surface 40y of the closing film 40. It is configured to be smaller than the adhesion between them. In this case, when the space between the front film 11 and the back film 12 is enlarged so as to release the fitting between the male member 46 and the female member 47, as shown in FIG. 27 (c), the easy peel film 49 are peeled off from the outer surface 12 y of the back film 12.

  By the way, when the chuck tape 45 and the closing film 40 are disposed between the front film 11 and the back film 12 so as to overlap with each other, the formation of the side edge seal portion 22 a is inhibited by the chuck tape 45. It is possible that the sealing performance of the In particular, it is considered that the formation of the side edge seal portion 22 a is easily inhibited at the positions where the end portions of the male member 46 and the female member 47 of the chuck tape 45 are present. Taking this point into consideration, as shown in FIGS. 28A and 28B, the above-mentioned through holes 43 may be formed also in the closing film 40 of the bag 1 provided with the chuck tape 45. 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 state closed by 40. FIG.

  According to the example shown in FIGS. 28A and 28B, the inner surface 11x of the surface film 11 and the inner surface of the back film 12 through the through hole 43 in the portion of the side edge seal portion 22a overlapping the through hole 43 of the closing film 40. The first type seal portion R1 can be formed by partially heat welding with 12x. This enables the bag 1 to be more tightly sealed. Preferably, the through hole 43 is disposed in the vicinity of the end of the male member 46 or the female member 47 so as to overlap the end of the male member 46 or the female member 47 of the chuck tape 45.

(Modification of outlet)
In the above-described embodiment, an example in which the outlet for taking out the contents from the storage portion S of the bag 1 is formed by breaking the bag 1 has been described. However, the present invention is not limited to this, and as shown in FIG. 29, the bag 1 is attached to, for example, the upper portion or the upper edge seal portion 21a of the bag 1 and includes the spout 26 for pouring out the contents. It is also good. In this case, a fluid having fluidity is employed as the content to be filled in the storage portion S of the bag 1.

(Modified example of planned opening part)
In the above-described embodiment, an example is shown in which the opening scheduled portion 25a, which is the opening by being opened, has the same width as the distance between the pair of side edge sealing portions 22a of the bag 1. However, the present invention is not limited to this. For example, as shown in FIG. 30, an outlet port 50 for taking out contents may be formed at the top of the bag 1. The outlet portion 50 is a portion provided to adjust the flow of contents when taking out contents such as fluid from the bag 1. The opening portion 25 is formed with an opening planned portion 25a which is an opening for taking out the fluid by being opened, and the width w of the opening planned portion 25a corresponds to the pair of side edge seal portions 22a of the bag 1. It is smaller than the interval between

  The specific shape of the outlet 50 is not particularly limited as long as the width w of the portion to be opened 25a of the outlet 50 is smaller than the distance between the pair of side edge seal portions 22a. . For example, as shown in FIG. 31, the outlet portion 50 may be configured as a portion having a width substantially half the distance between the pair of side edges 22. In this case, in the manufacturing process of the bag 1, the bag 1 can be manufactured by efficiently allocating the two bags 1 in which the outlet port 50 shown in FIG. 31 is formed.

  Moreover, as shown in FIG. 32, the bag 1 in which the extraction part 50 was formed may be further equipped with the above-mentioned chuck tape 45. As shown in FIG.

(Modified example of upper edge seal part)
As shown in FIG. 33, the upper edge seal portion 21 a of the bag 1 may be formed with a through hole 21 b for inserting a finger.

(Modified example of form of bag)
As shown in FIG. 34, the bag 1 includes an upper edge seal portion 21a and a lower edge seal portion 23a, and a back seal portion extending from a substantially central portion of the upper edge seal portion 21a toward a substantially central portion of the lower edge seal portion 23a. It may be a so-called pillow bag provided with 24. In this case, the back seal portion 24 is provided on the side opposite to the side on which the opening 15 is formed. For example, when the opening 15 is formed in the surface film 11, the back seal portion 24 is provided on the back film 12 side.

  An opening penetrating the surface film 11 even in a case where it is difficult to form an opening in the upper portion of the bag 1 to fill the contents as shown in FIGS. 29 to 34 described above. By forming 15, the content can be easily filled in the storage portion S of the bag 1. In addition, in the example shown in the above-mentioned FIG. 29-FIG. 34, the bag 1 of the state before the content is filled with the accommodating part S is shown.

(Modification of members that make up the bag)
In the embodiment described above, an example is shown in which the front film 11, the back film 12, the lower film 13 and the closing film 40 are different from each other. However, the present invention is not limited to this, and each of the films 11, 12, 13, 40 may be partially configured integrally. For example, as shown in FIG. 35, the first portion 11a of the surface film 11 and the back film 12 may be configured by folding a single film.

  FIG. 36 is a front view showing the bag 1 formed by using the films 11, 12, 13, 40 shown in FIG. As shown in FIG. 36, in the present modification, the upper portion of the bag 1 can be sealed without forming the above-described upper edge seal portion 21 a along the upper edge 21.

  In addition, at least a portion of the front film 11, at least a portion of the back film 12, and the lower film 13 may be configured by folding a single laminated film. In this case, folded portions exist between the front film 11 and the lower film 13 and between the back film 12 and the lower film 13. FIG. 37 shows an example in which the first portion 11a of the top film 11, the back film 12, the bottom film 13 and the second portion 11b of the top film 11 are formed in order by folding back a sheet of film.

  As shown in FIG. 35 and FIG. 37, when the front film 11, the back film 12, the lower film 13, etc. are configured by folding back one laminated film, the use of the laminated film necessary for producing the bag 1 The amount can be reduced.

(Other modifications)
In the 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.

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

DESCRIPTION OF SYMBOLS 1 bag 11 surface film 11a first portion 11b second portion 12 back surface film 13 lower surface film 15 opening 15a connecting portion 21 upper edge 21a upper edge seal portion 21b through hole 22 side edge 22a side edge seal portion 23 lower edge 23a lower edge Seal portion 24 Back seal portion 25 Notch 25a Planned portion 26 Spout 40 Film for closing 41 Mounting seal portion 42 Sealed portion for closure 43 Through hole 45 Chuck tape 46 Male member 47 Female member 48 Easy peel means 49 Easy peel film Reference Signs List 50 outlet port 51 thermoplastic resin layer 52 base material layer 53 second thermoplastic resin layer 56 first layer 57 second layer

Claims (10)

It is a bag in which a container is formed to be filled with contents,
At least a front film and a back film,
The housing portion is defined on the inside of the seal formed at least partially between the inner surface of the front film and the inner surface of the back film by heat welding along the outer edge of the front film and the outer edge of the back film. Created,
The seal portion includes a pair of side edge seal portions formed along a pair of side edges,
Among the front film and the back film, at least the front film, an opening penetrating the front film is formed to extend from one side edge of the bag to the other side edge of the bag ,
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 is configured to reach the pair of side edge seal portions but not to reach the pair of side edges.
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.   3. The bag according to claim 1, further comprising a chuck tape attached to at least the inner surface of the surface film and extending from one side edge seal portion to the other side edge seal portion of the pair of side edge seal portions. Described bag. The content to be filled in the storage portion is a fluid having fluidity.
The bag according to any one of the preceding claims, wherein the bag further comprises a spout for dispensing the fluid. The bag is formed with an opening scheduled portion that becomes an outlet by being opened,
The bag according to any one of claims 1 to 4, wherein the width of the portion to be opened is smaller than the distance between the pair of side edge seal portions of the bag. The seal includes an upper edge seal extending along the upper edge of the bag,
The bag according to any one of claims 1 to 5, wherein the upper edge seal portion is formed with a through hole. The bag further comprises a bottom film positioned between the top film and the back film to constitute a lower portion of the bag;
The bag according to any one of claims 1 to 6, wherein the lower surface film is folded such that a folded portion is convex toward the accommodation portion. It is a manufacturing method of the bag in which the storage part in which the contents are filled is formed,
Providing a first portion of the face film and a second portion of the face film and a back film;
Attaching a closing member to the inner surface of the surface film;
A seal is formed at least partially between the inner surface of the front film and the inner surface of the back film by heat welding along the outer edge of the front film and the outer edge of the back film, and the housing is housed inside the seal Defining a part, and
The housing portion is defined on the inside of the seal formed at least partially between the inner surface of the front film and the inner surface of the back film by heat welding along the outer edge of the front film and the outer edge of the back film. Created,
The seal portion includes a pair of side edge seal portions formed along a pair of side edges,
Among pre Symbol surface film and the back film the seal portion is formed, at least in the surface film, opening through the surface film, the other of the side edges from one of the side edges of the bag It is shaped to
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 is configured to reach the pair of side edge seal portions but not to reach the pair of side edges.
The closing member includes a first surface opposite to the surface film, and a second surface opposite to the first surface,
A method of manufacturing a bag, wherein a 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. It is a bag in which the content is filled in the container, and
At least a front film and a back film,
The housing portion is defined on the inside of the seal formed at least partially between the inner surface of the front film and the inner surface of the back film by heat welding along the outer edge of the front film and the outer edge of the back film. Created,
The seal portion includes a pair of side edge seal portions formed along a pair of side edges,
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.
Of the front surface film and the back surface film, at least the front surface film extends from one side edge to the other side edge of the bag at a position inside the seal portion that defines the storage portion. The opening is formed as
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 is configured to reach the pair of side edge seal portions but not to reach the pair of side edges.
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 contents were filled up in the seat part, and
Preparing the bag according to claim 1;
Filling the content 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.

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