JP6902835B2 - Packaging bag and manufacturing method of packaging bag - Google Patents

Description

The present invention relates to a packaging bag and a method for manufacturing a packaging bag.

In recent years, as a packaging bag for storing foods and refill contents such as detergents, a packaging bag using a laminate (film) containing a base material and a sealant layer has been used. The packaging bag is provided with a spout to facilitate the pouring of the contents, and a straw is used, for example, as a flow path auxiliary member for forming the flow path of the spout (for example, Patent Document 1).

Aliphatic polyesters such as polylactic acid, polyhydroxybutyrate, polycaprolactone, and polyptylene succinate have been developed for the purpose of reducing the amount of petroleum resources used in the material of such a flow path auxiliary member. Further, biomass polyethylene (plant-derived polyethylene) is attracting attention because it is environmentally friendly and has a quality close to that of petroleum polyethylene because ethylene, which is a raw material monomer, is obtained from biomass as compared with petroleum-derived polyethylene.

Japanese Unexamined Patent Publication No. 09-024956

When injection molding a flow path auxiliary member derived from biomass with a mold, there is a problem that the molded product adheres to the mold due to the low molecular weight component contained in polyethylene derived from biomass, and the molded product cannot be taken out from the mold. there were. It is also desired to have a configuration in which the contents in the packaging bag are more efficiently poured out through the spout.

The present invention has been made in view of the above-mentioned problems of the prior art, and the workability of the packaging bag capable of efficiently pouring the contents through the spout and the flow path auxiliary member by injection molding and the workability of the flow path auxiliary member by injection molding. One of the purposes is to provide a method for manufacturing a packaging bag that can improve the manufacturing efficiency.

The packaging bag according to one aspect of the present invention is a packaging bag having a spout, and is arranged in a pair of films that are overlapped with each other and an unsealed portion of the pair of films that serves as a flow path for the spout. The flow path auxiliary member includes a cylindrical flow path auxiliary member having a length in one direction and a point seal in which at least one of the pair of films and the flow path auxiliary member are welded. the length sides of the outer surface, has a tapered portion inclined at a predetermined angle the relative length direction.

In the packaging bag according to one aspect of the present invention, the inclination angle of the tapered portion may be in the range of 10 ° to 70 °.
In the packaging bag according to one aspect of the present invention, the flow path auxiliary member may have a shape symmetrical in the length direction.

In the packaging bag according to one aspect of the present invention, the flow path auxiliary member has a plane for forming the point seal in a part of the circumferential direction of the central portion in the length direction, and the plane is the plane. The configuration may be parallel to the length direction.

In the packaging bag according to one aspect of the present invention, the flow path auxiliary member may be configured to contain a polyolefin-based resin derived from biomass.

The method for manufacturing a packaging bag according to one aspect of the present invention is a method for manufacturing a packaging bag having a spout, which is superposed with a step of injection molding a flow path auxiliary member containing a biomass-derived polyolefin resin by a mold. One of the pair of films to be formed contains a polyolefin-based resin derived from biomass, and the outer surfaces on both sides in the length direction have tapered portions inclined at a predetermined angle with respect to the length direction. A desired region in a state in which a flow path auxiliary member having a shape is arranged and the flow path auxiliary member and one of the films are heat-welded, and a pair of the films are overlapped with the flow path auxiliary member interposed therebetween. In the step of forming the flow path auxiliary member, which comprises a step of obtaining a packaging bag by sealing the mold, the mold is formed on the inner wall surface of the fixed side mold and the movable side mold in the mold release direction. On the other hand, those having tapered portions that are inclined at a predetermined angle are used.

In the method for manufacturing a packaging bag according to one aspect of the present invention, in the step of molding the flow path auxiliary member, the fixed-side mold and the movable-side mold having the same tapered portions have the same shape as each other in the length direction. It may be a manufacturing method for forming the flow path auxiliary member having a symmetrical shape.

According to the present invention, there is a method for manufacturing a packaging bag capable of efficiently pouring out contents through a spout, and a packaging bag capable of improving the workability and manufacturing efficiency of a flow path auxiliary member by injection molding. Can be provided.

The plan view which shows the structure of the package with a spout in one Embodiment. The perspective view which shows the structure of the auxiliary member in one Embodiment. The figure which shows the structure of the bag making machine. The figure which shows the structure of the mold for molding an auxiliary member which is an example of a flow path auxiliary member. The flowchart for demonstrating the manufacturing method of the packaging bag in one Embodiment. The figure which shows the state of flow of contents in the case of the conventional auxiliary member (without a taper part). The figure which shows the state of the flow of the contents in the case of the auxiliary member (with a taper part) of this embodiment. It is a figure which shows the modification of the auxiliary member. (A), (b), and (c) are diagrams showing a modified example of the auxiliary member. (A), (b), and (c) are diagrams showing a modified example of the auxiliary member.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each drawing used in the following description, the scale of each member is appropriately changed in order to make each member recognizable.

FIG. 1 is a plan view showing the configuration of the packaging bag 5 with a spout according to the present embodiment.
As shown in FIG. 1, the packaging bag 5 of the present embodiment has two body film (films) 2 and 2 having the same planar shape and a bottom portion folded in half around a folding line 3a. It is a standing pouch composed of a film 3.

As shown in FIG. 1, the bottom film 3 is folded so that the folding line 3a faces inward and is interposed between the lower portions of the pair of body films 2 and 2. The pair of body films 2 and 2 and the bottom film 3 are overlapped with each other, and the peripheral edges of the body films 2 and 2 are heat-sealed to be integrally formed except for the filling port 13. Specifically, in the packaging bag 5, the side end sealing portions 5b and 5b formed by sealing the left and right side ends, and the lower side and the bottom film 3 of the body film 2 and 2 face each other. It has a bottom sealing portion 5a formed by sealing the lower end edges of the facing surfaces with each other. In FIG. 1, hatching is added to clearly indicate the range of the seal portion.

The filling port 13 located on the upper end side of the body films 2 and 2 is open for filling the contents, and the contents can be filled in the accommodating portion 1a of the packaging bag 5 through the filling port 13. It is possible. After the contents are filled in the accommodating portion 1a formed in the first unsealed portion 15A, the filling port 13 is closed by sealing in the same manner as the other portions. The first unsealed portion 15A is a portion in which the body film 2 and 2 are separably overlapped with each other without being sealed (bonded or joined). After the contents are filled in the accommodating portion 1a, the bottom film 3 is pushed downward by the weight of the contents, so that the bottom area is increased and the packaging bag 5 can stand.

As shown in FIG. 1, between the upper corner portion of the packaging bag 5, that is, the upper side 14a and the side side 14b, a second unsealed portion (unsealed portion) 15B serving as a flow path for the spout 14 is provided in the packaging bag. It is provided so as to face diagonally upward of 5.

The flow path forming seal portions 15a and 15b partition both side portions of the flow path 15 when the tip portion of the spout 14 is removed to open the flow path 15, and the flow path forming seal portions 15a and 15b are separated from each other. The second unsealed portion 15B between the other flow path forming sealed portion 15b becomes the flow path 15 of the injection port 14. The tip of the second unsealed portion 15B is closed by the flow path sealing sealed portion 15c. An auxiliary member (flow path auxiliary member) 4 that assists in forming the flow path is provided in the second unsealed portion 15B that serves as the flow path.

The auxiliary member 4 of the present embodiment contains a polyolefin-based resin derived from biomass. The auxiliary member 4 preferably contains 50% or more and 100% or less of a polyolefin-based resin derived from biomass. The density of the auxiliary member 4 ^{can be 0.910 to 0.960 kg / m 3,} and for example, 0.915 to 0.930 kg / m ³ is preferable.

The spout 14 is formed by an opening auxiliary line 9 formed so as to cross the second unsealed portion 15B serving as a flow path and a cutout line 17 on one end side of the opening auxiliary line 9 in order to facilitate opening. The pull tab 16 is provided. The opening auxiliary line 9 is provided on each of the two body films 2 and 2 including the spout 14.

The opening auxiliary line 9 is composed of a half-cut line. The half-cut line has a structure in which a part of the body film 2 in the thickness direction is continuously cut in the longitudinal direction. Since the body film 2 is connected at least in a part in the thickness direction, the contents do not leak through the half-cut line before opening. The range in which the opening auxiliary line 9 is formed in the thickness direction of the body film 2 is not particularly limited, but it is preferable that the cut portion is not exposed inside or outside (one or both) of the body film 2. Laser processing can be mentioned as a method of forming a half-cut line inside the body film 2. Examples of a method for forming a half-cut line on the surface of the body film 2 include laser machining and a cutting tool.

The dimensions of the packaging bag 5 are not particularly limited, but the suitable range for the refill container is that the height (length in the Y direction) of the packaging bag 5 is about 100 to 500 mm and the width of the packaging bag 5 (both sides). The maximum width between the ends: the length in the X direction) is about 70 to 300 mm, and the filling amount of the contents is about 100 to 5000 cm ³ . The content is not particularly limited, and examples thereof include a liquid substance, a solid such as a powder or a granule, a viscous substance, a liquid, or a mixture thereof.

As the film used as the body film 2 and the bottom film 3, a film made of, for example, biaxially stretched polypropylene, biaxially stretched polyamide, biaxially stretched polyester, or the like, which has been conventionally used, is used as the base film 19 (FIG. 3). ), A laminate 20 in which a polyolefin resin such as low-density polyethylene, linear low-density polyethylene, ethylene-vinyl acetate copolymer, polypropylene, etc. is laminated as a sealant film 18 (FIG. 3) on these base films 19. (Fig. 3) is used.

Examples of the method for producing the laminated body 20 include a dry laminating method, an extrusion laminating method, and a coextrusion method. An adhesive, an anchoring agent, or the like can be provided between the base film 19 and the sealant film 18 in order to improve the adhesive strength. In this case, a plurality of base films may be laminated in order to increase the strength of the packaging bag 5. Alternatively, in order to enhance the barrier property of gas and ultraviolet rays, a metal foil such as an aluminum foil, a metal vapor deposition layer, an inorganic vapor deposition layer such as ceramic, an ethylene-vinyl alcohol copolymer film, or the like may be laminated.

(Auxiliary member)
Next, the configuration of the auxiliary member, which is an example of the flow path auxiliary member according to the present invention, will be described in detail.
FIG. 2 is a perspective view showing the configuration of the auxiliary member 4 in the present embodiment.
As shown in FIG. 2, the auxiliary member 4 in the present embodiment is a straw having a substantially cylindrical shape having an inner peripheral surface 4a forming a flow path 6 in the center. The auxiliary member 4 has tapered portions 4A and 4A inclined at a predetermined angle with respect to the length direction on the outer surfaces 4c on both ends in the length direction (flow path direction A: FIG. 1), respectively. The inclination angles θ1 and θ2 of the tapered portions 4A and 4A can be arbitrarily set according to the type of contents and the like. The cylindrical portion 4B of the central portion of the auxiliary member 4 in the length direction has the same diameter in the length direction and has an outer peripheral surface (plane) 4b parallel to the length direction.

The auxiliary member 4 has a symmetrical shape in the length direction. In the present embodiment, the inclination angles θ1 and θ2 of the tapered portions 4A and 4A are equal to each other, and the ratio of the tapered portions 4A and 4A to the entire auxiliary member 4 is also equal to each other. The inclination angles θ1 and θ2 can be, for example, 10 ° to 70 °, and further can be 15 ° to 60 °.

Such an auxiliary member 4 is arranged so that its length direction is along the flow path direction A shown in FIG. 1, and is partially heat-welded to at least one part of the body film 2 by the point seal 7. , Is fixed.

The point seal 7 is applied to a part of the cylindrical portion 4B with a predetermined length. Specifically, by heating and pressing from the body film 2 side by point embossing, a part of the body film 2 and the auxiliary member 4 is heat-welded to be formed. The point seal 7 is provided so as to extend in the length direction of the auxiliary member 4, but the number, pattern shape, and the like can be appropriately changed.

[Bag making machine]
First, a configuration of a bag making machine 10 for continuously manufacturing a packaging bag 5 having a built-in auxiliary member 4 for pouring will be described.
FIG. 3 is a diagram showing the configuration of the bag making machine 10. FIG. 4 is a diagram showing a configuration of a mold 30 for molding an auxiliary member 4 which is an example of a flow path auxiliary member.

The bag making machine 10 shown in FIG. 3 is a manufacturing apparatus for manufacturing a packaging bag 5 serving as a standing pouch. The bag-making machine 10 includes an auxiliary member manufacturing unit 8 for manufacturing a plurality of auxiliary members 4, and a bag-making unit 12 for manufacturing a packaging bag 5 using the manufactured auxiliary members 4. .. Since the bag making machine 10 has two chamfers, two packaging bags 5 and 5 can be manufactured at the same time.

(Auxiliary member manufacturing part)
As shown in FIG. 4, the auxiliary member manufacturing unit 8 includes a mold 30 including a fixed-side mold 31 and a movable-side mold 32 arranged to face each other. The fixed-side mold 31 has a central convex portion 31A for forming a flow path 6 of the auxiliary member 4 in the center. The inner wall surfaces 31a and 32a of the fixed-side mold 31 and the movable-side mold 32 of the present embodiment are provided with punching tapers 33a and 33b having a predetermined inclination angle, respectively.

In the present embodiment, the punching taper angle θ3 of the fixed-side mold 31 and the punching taper angle θ4 of the movable-side mold 32 are equal to each other. The inner wall surface 34 continuous with the punching taper 33a of the movable mold 32 is a surface parallel to the extending direction of the central convex portion 31A of the fixed mold 31.

In the present embodiment, the inner wall surface 34 parallel to the mold release direction and the central convex portion 31A are provided in separate molds. As a result, the friction generated between the molded product and the mold 30 at the time of mold release is reduced, and the molded product can be easily taken out.

(Bag making part)
The bag making portion 12 includes a feeding roll 21, a recess forming means 49, a laminated body compounding means 42, auxiliary member supplying means 44, 44, buffer means 41, 41, bottom base material inserting means 22, 22, sealing means 56, 45. , 46, intermittent driving means 43, 48, cutters 42a, 47a, and guillotine cutter 47b, and is an area for producing a plurality of packaging bags 5 from a long laminated body 20 by two chamfers.

The laminated body biplane forming means 42 has a cutter 42a that cuts (half-cuts) the obtained laminated body 20 into two sheets at the center in the width direction to form a plurality of body films 2 and 2.

The auxiliary member supply means 44 is a means for continuously or intermittently transporting the auxiliary member 4 at a constant speed and supplying the auxiliary member 4 onto the lower body film 2. It is arranged outside the laminate 20 in the width direction. The auxiliary member supply means 44 in the present embodiment is a means for supplying the auxiliary member 4 to one side of the pair of body film 2 and 2, and includes the auxiliary member standby portion 54, the auxiliary member supply valve 58, and the auxiliary member supply valve 58. It includes an auxiliary member transporting means 52, an installation portion 53, and a point seal portion 55.

The auxiliary member standby unit 54 of the auxiliary member supply means 44 holds a plurality of auxiliary members 4 produced by the auxiliary member manufacturing unit 8 and waits until they are arranged on the body film 2 to be a back portion. The plurality of auxiliary members 4 are arranged and held in the vertical direction in parallel with each other in the auxiliary member standby portion 54, and are held by the auxiliary member supply valve 58 installed below the auxiliary member standby portion 54. They are supplied to the auxiliary member conveying means 52 one by one.

The installation unit 53 is a means for sucking and holding the auxiliary member 4 supplied on the auxiliary member transporting means 52 and arranging the auxiliary member 4 on the lower body film 2, and the body portion transported at a position separated from the upper and lower sides. It is arranged in the gap S between the films 2 and 2.

The point seal portion 55 (one of which is not shown in FIG. 3) is a means for temporarily fixing the auxiliary member 4 by point-sealing it on the body film 2.

The buffer means 41 and 41 are means for forming a variable amount of buffer on the body films 2 and 2 supplied by continuous feeding from the laminated biplane forming means 42, and are, for example, a pair of upper and lower dancer rolls or a plurality of pairs. It is equipped with 41a.

The bottom base material inserting means 22 and 22 are means for inserting the bottom film 3 between the body films 2 and 2 of the biplane. Since the bag making machine 10 has two chamfers, bottom base material insertion means 22 and 22 are provided on both sides of the body films 2 and 2 in the width direction, respectively. The bottom base material inserting means 22 is a means required when manufacturing a package having a bottom, and is not necessary when manufacturing a package without a bottom.

The intermittent driving means 43 is provided behind the buffer means 41 and 41, and is provided between the pair of body films 2 and 2 and the widthwise side ends of the body films 2 and 2 by the bottom base material inserting means 22. The bottom film 3 inserted in the above is overlapped and conveyed.

The intermittent driving means 48 is provided further behind the intermittent driving means 43 via the vertical sealing means 45 and the horizontal sealing means 46. As the intermittent drive means 43, 48, for example, a servomotor is used.

The auxiliary member sealing means 56 sandwiches the body film 2 and 2 overlapped via the auxiliary member 4 from above and below, heats the body film 2, and 2 from above and below, and then cools the body film 2 and 2 so that the auxiliary member 4 of the body film 2 and 2 is arranged. It is a means for heat-sealing a predetermined area.
In the present embodiment, the body films 2 and 2 are not heat-sealed over the circumferential direction of the auxiliary member 4, but a part of the auxiliary member 4 in the circumferential direction (for example, around the point seal 7) is partially heat-sealed. Heat seal and fix the auxiliary member 4 so that a gap is provided between the body films 2 and 2.
If the auxiliary member 4 is fixed to the body film 2 only by the point seal 7, the auxiliary member sealing means 56 becomes unnecessary.

The vertical sealing means 45 sandwiches the body films 2 and 2 and the bottom film 3 which are overlapped with each other from above and below, heats them, and then cools them to cool the bottom sealing portion of the packaging bag 5 of the body films 2 and 2. This is a means for heat-sealing the region to be 5a.
The lateral sealing means 46 heats the regions to be the side end sealing portions 5b and 5b of the body films 2 and 2 by sandwiching and heating the laminated body films 2 and 2 from above and below and then cooling. It is a means of sealing.

In the region where the biplane body films 2 and 2 are sealed by the auxiliary member sealing means 56, the vertical sealing means 45 and the horizontal sealing means 46, the biplane body films 2 and 2 are intermittently conveyed, and the operation of the transfer is performed. Is controlled so that the stop is repeated periodically. The operations of the vertical sealing means 45 and the horizontal sealing means 46 are controlled so as to perform sealing when the transport is stopped in synchronization with the transport of the body films 2 and 2. The positioning of the body films 2 and 2 at the time of this stop is accurate, and the positional accuracy required for heat sealing is ensured. Here, the above-mentioned intermittent driving means 43 and 48 are controllable so as to perform intermittent feeding synchronized with the intermittent feeding of the biplane body films 2 and 2 in the sealing means 45 and 46.

The cutter 47a is arranged at the center in the width direction of the body films 2 and 2 behind the vertical sealing means 45 and the horizontal sealing means 46, and cuts the body films 2 and 2 along the longitudinal direction thereof.

The guillotinecutter 47b is arranged further behind the cutter 47a via the intermittent driving means 48, cuts the long body films 2, 2 in the width direction, and separates them into individual packaging bags 5, 5, ... It is a thing.

[Manufacturing method of packaging bag]
Next, a method of manufacturing the packaging bag 5 in the present embodiment using the bag making machine 10 described above will be described. In the following description, FIGS. 3 and 4 will be referred to as appropriate.
FIG. 5 is a flowchart for explaining a method for manufacturing a packaging bag according to the present embodiment.

As shown in FIG. 5, the method for manufacturing a packaging bag in the present embodiment mainly includes an auxiliary member manufacturing step S1, a laminate compounding step S2, an auxiliary member supply step S3, a sealing step S4, and a separation step S5. ..

(1) Auxiliary member manufacturing process S1
By injecting and filling the cavity defined between the fixed-side mold 31 and the movable-side mold 32 of the mold 30 with a molding resin material derived from biomass, the movable-side mold 32 is retracted. , Auxiliary member 4 is manufactured. The movable mold 32 of the present embodiment is provided with punching tapers 33a and 33b that are inclined in a direction in which the movable mold 32 is retracted (a direction in which the molded product is released). Therefore, at the moment when the mold 30 is opened, a gap is generated between the auxiliary member 4 which is a molded product and the punching taper 33a, and the movable mold 32 can be smoothly released. Further, since the fixed-side mold 31 is also provided with the punching taper 33b, the molded product can be easily taken out from the fixed-side mold 31. The obtained molded product has a shape along the cavity of the mold 30. In this way, a plurality of auxiliary members 4 having tapered portions 4A and 4A on both end sides in the length direction as described above are manufactured.
The produced plurality of auxiliary members 4 are held by the auxiliary member standby portions 54, 54 of the pair of auxiliary member supply means 44, 44 arranged on both sides in the width direction of the body film 2.

(2) Laminated compound leaf forming step S2
First, with respect to the laminated body 20 unwound from the feeding roll 21, the arrangement regions of the auxiliary members 4 and 4 are heated by the preheating portion 49a in the recess forming means 49, and the recess 24 is formed in the arranging region heated by the recess forming portion 49b. , 24 are formed.
Next, the laminated body 20 in which the recesses 24 and 24 are formed is cut at the center in the width direction by the cutter 42a of the laminated body biplane forming means 42 to obtain two body films 2 and 2. After that, the body films 2 and 2 are conveyed with the sealant films 18 facing each other and separated from each other in the vertical direction.

(3) Auxiliary member supply process S3
Next, the auxiliary members 4 and 4 are supplied to the pair of recesses 24 and 24 in the one body film 2 which is conveyed downward.
Specifically, the auxiliary members 4 held by the auxiliary member standby unit 54 are transferred to the auxiliary member transfer means 52 one by one via the auxiliary member supply valve 58 installed below the auxiliary member standby unit 54. Supply. Then, the auxiliary member 4 conveyed on the auxiliary member conveying means 52 is sucked and held by the installation portion 53, moved onto the body film 2, and arranged in the recess 24. At this time, the auxiliary member 4 is arranged so that the length direction is parallel to the flow path direction A shown in FIG.

The auxiliary member 4 of the present embodiment has a symmetrical shape in the length direction. Therefore, there is no problem even if the vertical direction of the auxiliary member 4 is reversed when the installation portion 53 sucks and holds the auxiliary member 4. Since it is not necessary to individually determine the shape of the auxiliary member 4, smooth supply is possible.
Next, the auxiliary member 4 is temporarily fixed to the recesses 24 and 24 by the point seal portion 55.

(4) Sealing process S4
Next, the other body film 2 is superposed on one body film 2 on which the auxiliary member 4 is arranged and conveyed, and the desired regions of the body films 2 and 2 are sequentially sealed.
Specifically, by heating the portion where the auxiliary member 4 is interposed by the heater and then cooling in the cooling portion, the periphery of the auxiliary member 4 and the body film 2 are sealed, and the auxiliary member 4 is the body film. It is fixed to 2 and 2. In this way, the region of the body films 2 and 2 that serves as the injection port 14 of the packaging bag 5 is sealed.

After that, the laminated portions of the body films 2 and 2 and the bottom film 3 are vertically sealed along the conveying direction. Specifically, after heating with a heater, cooling is performed with a cooling unit to heat-seal the region of the body films 2 and 2 that becomes the bottom seal portion 5a of the packaging bag 5.

Subsequently, horizontal sealing is performed along the width direction of the body films 2 and 2. Specifically, after heating with a heater, cooling is performed with a cooling unit to heat-seal the regions of the body films 2 and 2 that are the side end sealing portions 5b and 5b of the packaging bag 5.

(5) Separation step S5
Next, the heat-sealed center portion of the body films 2 and 2 in the width direction is cut in half by a cutter 47a, and the center portion of the body films 2 and 2 in the width direction is cut along the transport direction to form two packaging bags. Separate into 5 and 5.
In this way, a plurality of packaging bags 5 with spouts are manufactured.

Conventionally, when an auxiliary member containing biomass-derived polyethylene is injection-molded by a mold, the molded product adheres to the mold due to the low molecular weight component contained in the biomass-derived polyethylene, so that the molded product is molded from the mold. The problem was that it was difficult to take out the product. If the mold has many vertical surfaces (planes perpendicular to the mold release direction), the friction with the molded product (resin) may increase and the molded product may not be taken out from the mold 30. ..

On the other hand, in the manufacturing method of the present embodiment, the punching tapers 33a and 33b are provided on both the fixed side mold 31 and the movable side mold 32 of the mold 30 for molding the auxiliary member 4. As a result, at the time of mold release, a gap is created between the punched tapers 33a and 33b of the fixed side mold 31 and the movable side mold 32 and the molded product, so that the molded product is made of a resin having a high degree of biomass. However, the molded product (auxiliary member 4) can be smoothly taken out from the mold 30. Therefore, the workability and manufacturing efficiency of the auxiliary member manufacturing process are improved, and the workability and manufacturing efficiency of the packaging bag manufacturing method as a whole are also improved.

Further, since the auxiliary member 4 produced by the mold 30 has tapered portions 4A and 4A on both ends in the length direction and has a symmetrical shape in the length direction, the auxiliary member supply step S3 In, when the auxiliary member 4 is arranged at a predetermined place on the body film 2 by the installation portion 53, the auxiliary member 4 can be arranged without worrying about the vertical orientation of the auxiliary member 4. As a result, workability in the auxiliary member supply process S3 is also improved.

As shown in FIG. 6, the conventional auxiliary member 90 has a cylindrical shape as a whole in the length direction, and does not have tapered portions 4A and 4A as in the present embodiment. Therefore, the contents did not flow into the gap K between the body films 2 and 2 and the auxiliary member 90 very smoothly, and the flow path resistance was increased.

On the other hand, in the present embodiment, as shown in FIG. 7, the auxiliary member 4 has tapered portions 4A and 4A. Therefore, the contents contained in the accommodating portion 1a easily flow into the gap K between the body film 2 and 2 and the auxiliary member 4, and the body film is also provided on the end side of the spout 14. Since the gap K between the 2 and 2 and the auxiliary member 4 is widened, the amount of the contents discharged from the packaging bag 5 increases. By providing the auxiliary member 4 having the tapered portions 4A and 4A in this way, the fluidity of the contents is improved in the entire spout 14, and the contents can be efficiently poured out through the spout 14. ..

Further, since the auxiliary member 4 is formed with a cylindrical portion 4B having no taper in the central portion in the length direction, it is easy to form the point seal 7 on the outer peripheral surface 4b parallel to the length direction. Further, when the auxiliary member 4 is arranged on the body film 2, the outer peripheral surface 4b of the cylindrical portion 4B is in contact with the body film 2 in the length direction to stabilize the auxiliary member 4, so that the auxiliary member 4 is in contact with the body film 2 in the length direction. The auxiliary member 4 can be arranged in a state where the flow path direction of the spout 14 is aligned with the flow path direction and parallel to each other.

Although the preferred embodiments according to the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above examples. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the technical idea described in the claims, and of course, the technical scope of the present invention also includes them. It is understood that it belongs to. The configurations of the respective embodiments may be combined as appropriate.

Considering workability during manufacturing, the auxiliary member 4 preferably has a symmetrical shape in the length direction, but is not necessarily limited to this.
For example, the ratio of the tapered portions 4A and 4A to the entire auxiliary member 4 may be appropriately changed, and as shown in FIG. 8, the cylindrical portion 4B has a larger overall auxiliary member 4 than the tapered portions 4A and 4A. The shape may be a shape that occupies a large proportion of. Further, the ratios of the tapered portions 4A and 4A may be different from each other. Further, the tapered portion 4A may be provided only on one end side in the length direction.

Further, as shown in FIGS. 9A, 9B, and 9C, the shape may be formed only by the tapered portions 4A and 4A and does not have a cylindrical portion. Even in this case, the inclination angles θa, θb, and θc of the tapered portions 4A and 4A may be appropriately set according to the type of the content and the like. Among these three examples, the configuration of FIG. 9 (b) is preferable to FIG. 9 (a), and the configuration of FIG. 9 (b) is preferable to FIG. 9 (b) from the viewpoint of environmental friendliness depending on the amount of resin used and the point sealing. The configuration shown in FIG. 9C is preferable.

Further, as shown in FIGS. 10A, 10B, and 10C, the outer surface 4d may have a shape in which a continuous tapered portion 4C is provided in the entire length direction. The tapered portion 4C is formed of a curved surface that protrudes most radially outward in the central portion in the length direction, and the curvature of the outer surface 4d may be appropriately set according to the type of contents and the like. Among these three examples, the configuration of FIG. 10 (b) is preferable to FIG. 10 (a) from the viewpoint of environmental friendliness depending on the amount of resin used, and FIG. 10 (c) is preferable to FIG. 10 (b). The configuration is preferable.

2 ... Body film (film), 4 ... Auxiliary member (flow path auxiliary member), 4A, 4C ... Tapered part, 4b ... Outer surface (flat surface), 4c ... Outer surface, 5 ... Packaging bag, 6 ... Flow path, 14 ... spout, 15B ... second unsealed part (unsealed part), 19 ... point seal, 30 ... mold, 31 ... fixed side mold, 32 ... movable side mold, 31a, 34 ... inner wall surface

Claims (7)

A packaging bag with a spout
A pair of films that are layered on top of each other
A cylindrical flow path auxiliary member arranged in an unsealed portion of the pair of films that serves as a flow path for the spout and having a length in one direction.
A point seal in which at least one of the pair of films and the flow path auxiliary member are welded is provided.
The channel support member is in the longitudinal direction on both sides of the outer surface, it has a tapered portion inclined at a predetermined angle the relative length direction, the packaging bag. The inclination angle of the tapered portion is in the range of 10 ° to 70 °.
The packaging bag according to claim 1. The flow path auxiliary member has a symmetrical shape in the length direction.
The packaging bag according to claim 1 or 2. The flow path auxiliary member has a plane for forming the point seal in a part of the circumferential direction of the central portion in the length direction, and the plane is parallel to the length direction.
The packaging bag according to any one of claims 1 to 3. The flow path auxiliary member contains a biomass-derived polyolefin resin.
The packaging bag according to any one of claims 1 to 4. A method of manufacturing a packaging bag with a spout.
A process of injection molding a flow path auxiliary member containing a biomass-derived polyolefin resin by a mold, and
One of the pair of films to be overlapped with each other contains a polyolefin-based resin derived from biomass, and the outer surfaces on both sides in the length direction have tapered portions inclined at a predetermined angle with respect to the length direction. A step of arranging the cylindrical flow path auxiliary member and heat-welding the flow path auxiliary member and one of the films.
It has a step of obtaining a packaging bag by sealing a desired region in a state where the pair of the films are stacked with the flow path auxiliary member interposed therebetween.
In the step of molding the flow path auxiliary member,
A method for manufacturing a packaging bag, wherein the mold has a tapered portion on the inner wall surface of a fixed-side mold and a movable-side mold that are inclined at a predetermined angle with respect to the mold release direction. In the step of molding the flow path auxiliary member,
The fixed-side mold and the movable-side mold having the same tapered portion form the flow path auxiliary member having a symmetrical shape in the length direction.
The method for manufacturing a packaging bag according to claim 6.

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