Method for manufacturing packaging bag and method for manufacturing article filled with content therein

Abstract

To provide a method for manufacturing a packaging bag which can be filled with contents from a lower part and can stand by itself in use by a simple process, and a method for manufacturing an article filled with the contents.SOLUTION: A bag body (10) formed by two side surface sheets (1112,) arranged opposite to each other and having an opening at a lower part; and an air bag (20) arranged between the two side surface sheets (1112,) at a lower part of the bag body (10), and a bottom surface sheet 20 folded in an inverted V-shape, wherein the bottom surface sheet 20 is sealed only with one side surface sheet 11 and forms an opening 23 with the other side surface sheet 12, and when manufacturing the packaging bag 1 in which inner surfaces 21b and 22b facing each other by being folded in the inverted V-shape of the bottom surface sheet 20 are sealed, a seal blocking plate 31 is inserted into a region forming the opening 23, and then a portion between the seal blocking plate 31 and the two side surface sheets 1112 is heated by a seal bar 30.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing a self-standing packaging bag and a method for manufacturing an article filled with a content in the bag. [Background technology]

[0002] Self-standing packaging bags with a base material are also called stand-up pouches, and are advantageous over flat bags in that they can secure a large internal volume. On the other hand, if the top of the packaging bag has a spout for removing the contents or a zipper seal for adding the contents later, it is difficult to fill the contents from the top or side of the packaging bag, so the contents must be filled from the bottom. However, in the case of stand-up pouches, because the base material is present at the bottom of the packaging bag, there is a problem in that when trying to fill the contents from the bottom, the filling nozzle and the base material interfere with each other.

[0003] Patent Document 1 describes a packaging bag comprising a first side sheet, a second side sheet, and a bottom sheet, the bottom sheet being arranged between the first side sheet and the second side sheet in a V-shaped cross section, and having a joint around the periphery, wherein the V-shaped bottom sheet is formed by a first bottom sheet facing the first side sheet and a second bottom sheet facing the second side sheet, the lower part of the first bottom sheet having a bottom joint joined to the lower part of the first side sheet, the second bottom sheet having an opening that is not joined to the second side sheet and opens the inside of the packaging bag, and the bottom sheet having a bottom sheet joint where the opposing outer surfaces of the first bottom sheet and the second bottom sheet are joined together. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-18907 Summary of the Invention [Problem to be solved by the invention]

[0005] The packaging bag described in Patent Document 1 requires the creation of a bottom joint where the lower part of the first bottom sheet is joined to the lower part of the first side sheet, an opening where the second bottom sheet is not joined to the second side sheet, and a bottom sheet joint where the opposing outer surfaces of the first bottom sheet and the second bottom sheet are joined. However, when attempting to heat-seal the first side sheet and the second side sheet to simultaneously form these joints, there is a problem in that the unjoined areas end up being joined.

[0006] Therefore, an object of the present invention is to provide a method for manufacturing a packaging bag using simple steps that can be filled with contents from the bottom and that can stand on its own when in use, and a method for manufacturing an article filled with contents in the bag. [Means for solving the problem]

[0007] The present invention provides a bag body 10 formed by a first side sheet 11 and a second side sheet 12 arranged opposite to each other and having an opening at the bottom; a bottom sheet 20 that is arranged between the first side sheet 11 and the second side sheet 12 at the bottom of the bag body 10 and is folded into an inverted V shape; and an outer surface 21a of a first region 21 of the bottom sheet 20 facing the first side sheet 11 is heat-sealed to the first side sheet 11 in a sealing region 11s; At least a portion of the space between the outer surface 22a of the second region 22 of the bottom sheet 20 facing the second side sheet 12 and the second side sheet 12 is not sealed, forming an opening 23 that connects the inside and outside of the bag body 10, The bottom sheet 20 is folded in an inverted V shape, and the inner surface 21b of the first region 21 and the inner surface 22b of the second region 22, which face each other, are heat-sealed in a sealing region 20s. A manufacturing method of a packaging bag 1, inserting a seal inhibiting plate into the area that forms the opening 23 between the outer surface 22a of the bottom sheet 20 and the second side sheet 12; a step of heating positions corresponding to the seal areas 11s and 20s between the first side sheet 11 and the second side sheet 12 with a seal bar to form the seal areas 11s and 20s; have This is a method for manufacturing the packaging bag 1.

[0008] The present invention provides A step of obtaining a packaging bag 1 by the above method; a step of filling the contents 2 into the bag body 10 through the opening 23 of the packaging bag 1; a step of sealing a seal area 12s between the outer surface 22a and the second side sheet 12 to seal the interior of the bag body 10; have A method for manufacturing an article. [Effects of the Invention]

[0009] According to the present invention, a packaging bag that can be filled with contents from the bottom and that can stand on its own when in use can be manufactured using a simple process, and an article filled with contents can be manufactured. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 2 is an exploded perspective view showing the configuration of the packaging bag 1. [Figure 2] 1A and 1B are plan views showing a packaging bag 1, in which (a) is a plan view seen from the first side sheet 11 side, and (b) is a plan view seen from the second side sheet 12 side. [Figure 3] 2 is an enlarged side cross-sectional view showing the structure of the lower part of the packaging bag 1. FIG. [Figure 4] This is an enlarged side cross-sectional view explaining the manufacturing method of the packaging bag 1, where (a) shows the state just before the bottom of the packaging bag 1 is heat-sealed, and (b) shows the state after the bottom of the packaging bag 1 is heat-sealed. [Figure 5] 1 is a plan view of an article 5 in which a content 2 is filled into a packaging bag 1 and sealed, as viewed from the second side sheet 12 side. [Figure 6] This is an enlarged cross-sectional view showing the structure of the bottom of an item 5 in which contents 2 are filled and sealed in a packaging bag 1, where (a) shows the state in which the bottom sheet 20 is folded into an inverted V shape and sealed, and (b) shows the state in which the seal has been peeled off and the item is standing on its own. [Figure 7] 1 is a perspective view showing a state in which an article 5 is self-standing after being filled with contents 2 in a packaging bag 1 and sealed. DETAILED DESCRIPTION OF THE INVENTION

[0011] One embodiment of a packaging bag 1 manufactured by the present invention will be described with reference to the drawings. Fig. 1 is an exploded perspective view showing the configuration of the packaging bag 1. Fig. 2(a) is a plan view of the packaging bag 1 seen from the first side sheet 11 side, and Fig. 2(b) is a plan view of the packaging bag 1 seen from the second side sheet 12 side. Fig. 3 is an enlarged side cross-sectional view showing the structure of the lower part of the packaging bag 1. The packaging bag 1 is ultimately self-standing, and is particularly suitable for use when heating the contents in a microwave oven while it is self-standing, and is even more suitable for use when heating food ingredients.

[0012] The packaging bag 1 has a bag body 10 that is formed by a first side sheet 11 and a second side sheet 12 that are arranged opposite each other and that is open at the bottom. As shown in Figures 1 and 2, the bag body 10 may be made of two separate sheets (the first side sheet 11 and the second side sheet 12) whose top and side edges are sealed, or may be made of a single continuous sheet that is folded at its side edge or top edge and whose remaining top and side edges are sealed.

[0013] Considering that the contents will be heated in a microwave oven, the first side sheet 11 and the second side sheet 12 are preferably made of a plastic material that is heat-resistant to microwave heating. Specific examples of such plastic materials include polyolefins such as polyethylene and polypropylene; halogenated polyolefins such as polyvinylidene chloride and polyvinylidene fluoride; polyvinyl alcohol; polyamides such as nylon 6, nylon 6,6, and polymetaxylylene adipamide; polyesters such as polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, and polybutylene naphthalate; polyacrylic acid esters such as polymethyl(meth)acrylate, polyethyl(meth)acrylate, and polybutyl(meth)acrylate; and copolymers of monomers that form these. Note that "(meth)acrylic" refers to either methacrylic or acrylic.

[0014] Specific examples of polyethylene include linear low-density polyethylene, high-pressure low-density polyethylene, high-density polyethylene, metallocene polyethylene, etc. Specific examples of polypropylene include propylene homopolymer, random or block copolymer of propylene with ethylene or 1-butene, etc.

[0015] The first side sheet 11 and the second side sheet 12 may be a single layer, or may be laminated with two or more layers by coextrusion, coating, or the like. For example, the first side sheet 11 and the second side sheet 12 preferably comprise a substrate layer and a sealant layer, and may further comprise another layer between the substrate layer and the sealant layer. Specifically, the first side sheet 11 and the second side sheet 12 can be a laminate film (e.g., PET#12 / Ny#15 / CPP#80) formed by laminating a polyethylene terephthalate / polyamide film as a substrate layer with an unstretched polypropylene film as a sealant layer. The first side sheet 11 and the second side sheet 12 may also be a gas-barrier composite film provided with a thin inorganic oxide film such as aluminum oxide or silicon oxide. This composite film can be obtained by heating and vaporizing aluminum oxide or silicon oxide alone or in a mixture under vacuum and depositing the vapor on the surface of the above-mentioned film.

[0016] The seals on the top and / or side edges of the first side sheet 11 and the second side sheet 12 may be completely sealed at 25°C and 100°C, or may be easy to open. In this case, the seal strength at 25°C and 100°C is preferably 10 to 30 N / 15 mm, more preferably 12 to 25 N / 15 mm. The seal strength at 25°C and 100°C is the value measured at 25°C and 100°C, respectively, in accordance with JIS Z0238 "Test method for sealed flexible packaging bags" (the same applies hereinafter).

[0017] As shown in Fig. 1, the packaging bag 1 has a bottom sheet 20 that is placed between a first side sheet 11 and a second side sheet 12 at the bottom of the bag body 10 and is folded into an inverted V shape. This bottom sheet 20 ultimately functions as the base, allowing the packaging bag 1 to stand on its own. The bottom sheet 20 has a first region 21 facing the first side sheet 11 and a second region 22 facing the second side sheet 12. The bottom sheet 20 may be a single sheet folded at its top edge, as shown in Fig. 1, or may be two sheets with their top edges connected together.

[0018] 2 and 3, the outer surface 21a of the first region 21 of the bottom sheet 20 is heat-sealed in the sealed region 11s between the first side sheet 11 and the outer surface 22a of the second region 22 of the bottom sheet 20, but at least a portion of the space between the outer surface 22a of the second region 22 of the bottom sheet 20 and the second side sheet 12 is not sealed. That is, the space between the outer surface 21a of the first region 21 and the first side sheet 11 does not allow communication between the inside and outside of the bag body 10, whereas the unsealed portion between the outer surface 22a of the second region 22 and the second side sheet 12 forms an opening 23 that allows communication between the inside and outside of the bag body 10. With this configuration, it is possible to fill the contents through the opening 23 formed in the bottom of the packaging bag 1.

[0019] Furthermore, the inner surface 21b of the first region 21 and the inner surface 22b of the second region 22, which are opposed by folding the bottom sheet 20 into an inverted V shape, are heat-sealed in a sealing region 20s. This makes it less likely that the filling nozzle will interfere with the bottom sheet 20 when filling the contents through an opening 23 formed in the bottom of the packaging bag 1. From the viewpoint of manufacturing using a simple process, it is preferable that the sealing region 20s be located in a position overlapping the sealing region 11s.

[0020] When food ingredients are filled into the packaging bag, the filled packaging bag needs to be heat sterilized. However, if the inside surface 21b and the inside surface 22b peel off when the filled packaging bag is heat sterilized, there is a problem that the filled packaging bag cannot be maintained in a compact state when transporting or selling the packaging bag.

[0021] Therefore, it is preferable that the seal strength between the inner surface 21b and the inner surface 22b at 100°C is 0.5 N / 15 mm or more. By doing so, even when the packaging bag 1 filled with contents is heat sterilized, the inner surface 21b and the inner surface 22b will not peel off, and the bag can be maintained in a compact state during transportation and sales. The seal strength between the inner surface 21b and the inner surface 22b at 100°C is more preferably 1 N / 15 mm or more, and even more preferably 2 N / 15 mm or more. The seal strength between the inner surface 21b and the inner surface 22b at 100°C can be, for example, 30 N / 15 mm or less.

[0022] Furthermore, from the viewpoint of ultimately enabling the packaging bag 1 to stand on its own, it is preferable that the inner surface 21b and the inner surface 22b are easily peelable from each other. More specifically, the seal strength between the inner surface 21b and the inner surface 22b at 25°C is preferably 0.5 to 30 N / 15 mm. This allows the user to peel the inner surface 21b and the inner surface 22b at the time of use, thereby making the packaging bag 1 stand on its own. The seal strength between the inner surface 21b and the inner surface 22b at 25°C is more preferably 1 to 25 N / 15 mm, and even more preferably 2 to 10 N / 15 mm.

[0023] 2 and 3, there is preferably an unsealed area at the center of the first upper portion between the outer surface 21a of the first region 21 and the first side sheet 11, so that the first region 21 of the bottom sheet 20 will ultimately function as a base material. Regarding the seal strength between the outer surface 21a of the first region 21 and the first side sheet 11, the same embodiment as the seal strength of the upper edges and / or side edges of the first side sheet 11 and the second side sheet 12 described above can be adopted.

[0024] 2(a), it is preferable to provide an unsealed region 11x at the lower end between the outer surface 21a of the first region 21 and the first side sheet 11. This allows the user to easily pinch the unsealed region 11x of the first side sheet 11 with their fingers and peel the inner surface 21b from the inner surface 22b. The shape of the unsealed region 11x is arbitrary. For example, a line seal can be provided at a predetermined height (preferably 3 to 30 mm) from the lower end of the first side sheet 11 to form the unsealed region 11x below the line seal. Alternatively, a rectangular unsealed region 11x (preferably 30 to 80 mm wide x 3 to 30 mm high) can be formed in the center of the lower end of the first side sheet 11.

[0025] In order to achieve the above-mentioned configuration, the sealing region 11s is preferably in the form of a strip or line having a width of 3 to 30 mm in plan view seen from the first side sheet 11 side.

[0026] At least a portion of the space between the outer surface 22a of the second region 22 and the second side sheet 12 is not sealed, but there may be a sealed region as long as an opening 23 that connects the inside and outside of the bag 10 can be formed. For example, it is preferable that both sides between the outer surface 22a of the second region 22 and the second side sheet 12 are sealed. The seal strength can be the same as that of the top and / or side edges of the first side sheet 11 and the second side sheet 12 described above.

[0027] However, since the packaging bag 1 is sealed with the contents filled inside, it is preferable that the outer surface 22a of the second region 22 is heat-sealable to the second side sheet 12. Regarding the seal strength when heat-sealed, the same embodiment as the seal strength of the top edge and / or side edge of the first side sheet 11 and the second side sheet 12 described above can be adopted.

[0028] Considering that the bottom sheet 20 will be heated in a microwave oven, it is preferable that the bottom sheet 20 be made of a plastic material that is heat-resistant to microwave heating. Specific examples of such plastic materials are the same as those of the first side sheet 11 and the second side sheet 12 described above. The plastic material that constitutes the inner surface 21b and the inner surface 22b can be polyvinylidene chloride (PVDC), etc., from the viewpoint of the seal strength at 25°C and 100°C described above. In other words, it is preferable that both layers that constitute the inner surface 21b and the inner surface 22b be made of polyvinylidene chloride.

[0029] The bottom sheet 20 may be a single layer, or may be laminated with two or more layers by coextrusion, coating, or the like. For example, the bottom sheet 20 preferably comprises an inner release layer constituting the inner surfaces 21b and 22b, a base layer, and an outer sealant layer constituting the outer surfaces 21a and 22a. Other layers may be present between the base layer and the inner release layer and / or the outer sealant layer. Specifically, the bottom sheet 20 may be a laminated film (e.g., PVDC#1 / Ny#15 / PET#12 / Ny#15 / CPP#80) in which a polyethylene terephthalate / polyamide film serving as a base layer is bonded to one side thereof as an inner release layer constituting the inner surfaces 21b and 22b, and an unstretched polypropylene film is bonded to the other side thereof as an outer sealant layer constituting the outer surfaces 21a and 22a. The first side sheet 11 and the second side sheet 12 may also be a gas-barrier composite film provided with a thin inorganic oxide film such as aluminum oxide or silicon oxide. This composite film can be obtained by heating and vaporizing aluminum oxide or silicon oxide alone or in a mixture under vacuum, and depositing the vapor on the surface of the above-mentioned film.

[0030] The top and / or side of the packaging bag 1 may be provided with a spout for discharging the contents or a zipper seal for later adding the contents. In such cases, it is difficult to fill the contents from the top or side of the packaging bag 1, and it is necessary to fill the contents from the bottom of the packaging bag 1, so that the packaging bag 1 having the above-mentioned configuration is very effective. It is preferable that the packaging bag 1 has a steam passage part for allowing internal steam to escape when the contents (especially food ingredients) are heated in a microwave oven while the packaging bag 1 is standing upright.

[0031] Next, an embodiment of a method for manufacturing the packaging bag 1 according to the present invention will be described with reference to the drawings. Figure 4 is an enlarged side cross-sectional view illustrating the method for manufacturing the packaging bag 1, where Figure 4(a) shows the state immediately before the lower part of the packaging bag 1 is heat-sealed, and Figure 4(b) shows the state after the lower part of the packaging bag 1 has been heat-sealed.

[0032] In the present invention, first, a seal inhibiting plate 31 is inserted into the area where the opening 23 is to be formed between the outer surface 22a of the bottom sheet 20 and the second side sheet 12 (FIG. 4(a)). Then, the positions corresponding to the seal area 11s and the seal area 20s between the first side sheet 11 and the second side sheet 12 are heated with a seal bar 30 to form the seal area 11s and the seal area 20s (FIG. 4(b)).

[0033] As described above, the sealing area 11s and the sealing area 20s are preferably positioned so as to overlap. In this case, the sealing area 11s and the sealing area 20s can be heat-sealed simultaneously. However, if the sealing bar 30 heats the area between the first side sheet 11 and the second side sheet 12, not only the sealing area 11s and the sealing area 20s but also the area between the outer surface 22a of the bottom sheet 20 and the second side sheet 12 will be heat-sealed, preventing the formation of the opening 23. Therefore, in the present invention, a sealing inhibiting plate 31 is inserted between the outer surface 22a of the bottom sheet 20 and the second side sheet 12. This allows the sealing area 11s and the sealing area 20s to be heat-sealed and the opening 23 to be formed. In other words, a packaging bag 1 that can be filled from below and that can stand up when used can be manufactured through a simple process.

[0034] The seal inhibiting plate 31 may be any material that can inhibit heat sealing between the outer surface 22a of the bottom sheet 20 and the second side sheet 12, and may be made of metals such as aluminum, stainless steel, brass, ceramics, resin, etc. From the standpoint of durability, it is preferable to use a metal plate as the seal inhibiting plate 31, and it is more preferable to use a stainless steel plate.

[0035] The heat sealing conditions may be appropriately selected based on the conditions under which the sealing area 11s and the sealing area 20s are heat sealed. For example, the sealing temperature by the sealing bar 30 may be set to 150 to 300°C (preferably 200 to 250°C), and the sealing time may be set to 100 to 600 milliseconds (preferably 200 to 400 milliseconds).

[0036] Next, one embodiment of an article 5 manufactured by the present invention will be described with reference to the drawings. FIG. 5 is a view of the article 5, in which the contents 2 are filled into the packaging bag 1 and sealed, as viewed from the side of the second side sheet 12. FIG. 6 is an enlarged cross-sectional view showing the structure of the lower part of the article 5, in which the contents 2 are filled into the packaging bag 1 and sealed, with FIG. 6(a) showing the bottom sheet 20 folded into an inverted V shape and sealed, and FIG. 6(b) showing the state in which the seal has been peeled off and the article 5 is standing upright. FIG. 7 is a perspective view showing the state in which the contents 2 are filled into the packaging bag 1 and sealed, and the article 5 is standing upright. The contents 2 are preferably foodstuffs, more preferably foodstuffs to be heated in a microwave oven. In this case, the article 5 is a foodstuff package product.

[0037] As shown in FIG. 7 , the article 5 includes the packaging bag 1 and the contents 2 filled in the bag body 10. As described above, at least a portion of the space between the outer surface 22a of the second region 22 of the bottom sheet 20 and the second side sheet 12 in the packaging bag 1 is unsealed, forming an opening 23 that connects the inside and outside of the bag body 10. The contents 2 are filled into the bag body 10 through the opening 23 of the packaging bag 1, and as shown in FIG. 6( a), the sealed area 12s between the outer surface 22a of the second region 22 and the second side sheet 12 is sealed (preferably by heat sealing), thereby producing the article 5 with the inside of the bag body 10 sealed. The sealed area 12s may or may not overlap the sealed areas 11s and 20s. The heat-sealing conditions (heating temperature, heating time, etc.) for forming the sealed area 12s by heat sealing are the same as those described above.

[0038] In order to allow the second region 22 of the bottom sheet 20 to ultimately function as a base material, it is preferable that there is an unsealed region at the top center between the outer surface 22a of the second region 22 and the second side sheet 12, as shown in Fig. 5, similar to the first region 21. Regarding the seal strength between the outer surface 22a of the second region 22 and the second side sheet 12, the same embodiment as the seal strength of the top edge and / or side edge of the first side sheet 11 and the second side sheet 12 described above can be adopted.

[0039] As shown in FIG. 5, it is preferable to provide an unsealed region 12x at the lower end between the outer surface 22a of the second region 22 and the second side sheet 12. This allows the user to easily pinch the unsealed region 12x of the second side sheet 12 with their fingers and peel the inner surface 21b from the inner surface 22b. The unsealed region 12x may have any shape. For example, a line seal may be provided at a predetermined height (preferably 3 to 30 mm) from the lower end of the second side sheet 12 to define the unsealed region 12x below the line seal. Alternatively, a rectangular unsealed region 12x (preferably 30 to 80 mm wide x 3 to 30 mm high) may be formed in the center of the lower end of the second side sheet 12. The shapes of the unsealed region 11x and the unsealed region 12x may be the same or different.

[0040] In order to achieve the above-mentioned configuration, the sealing region 12s is preferably in the form of a strip or line having a width of 3 to 30 mm in plan view seen from the second side sheet 12 side.

[0041] In the packaging bag 1 or the item 5, the inner surface 21b of the first region 21 and the inner surface 22b of the second region 22, which face each other when the bottom sheet 20 is folded into an inverted V shape, are sealed simultaneously by the heat used to heat-seal the outer surface 21a of the bottom sheet 20 and the side sheet 11, as described above, in order to improve the efficiency of the manufacturing process.

[0042] In this case, the packaging bag 1 or the article 5 preferably has an unsealed region 20x at the lower end between the inner surface 21b of the first region 21 and the inner surface 22b of the second region 22, as shown in Fig. 3 or 6. This allows a user to easily pinch the unsealed region 20x with their fingers and peel the inner surface 21b from the inner surface 22b. The shape of the unsealed region 20x is arbitrary, but for example, by applying a line seal at a predetermined height (preferably 3 to 30 mm) from the lower ends of the first region 21 and the second region 22, the unsealed region 20x can be formed below the line seal. Alternatively, the unsealed region 20x can be formed in a rectangular shape (preferably 30 to 80 mm wide x 3 to 30 mm high) in the center of the lower ends of the first region 21 and the second region 22.

[0043] To achieve the above configuration, the sealed region 20s is preferably strip-shaped or linear with a width of 3 to 30 mm in plan view from the first side sheet 11 or second side sheet 12 side.

[0044] As described above, according to the present invention, it is possible to manufacture an article 5 in which a self-standing packaging bag 1 is filled with contents 2. In particular, if the seal strength between inner surface 21b and inner surface 22b at 100°C is 0.5 N / 15 mm or more, the inner surface 21b and inner surface 22b remain sealed even after heat sterilization, allowing the article 5 to remain compact during transportation and sale. Furthermore, when in use, the user can peel the inner surface 21b and inner surface 22b apart, allowing the article 5 to stand on its own. Although the preferred embodiment of the present invention has been described above, the present invention is not limited to this. [Explanation of symbols]

[0045] 1 packaging bag 2 Contents 5 Goods 10 Bag body 11 First side sheet 11s seal area 11x Unsealed Areas 12 Second side sheet 12s seal area 12x unsealed areas 20 Bottom sheet 20s Seal Area 20x unsealed area 21 The First Region 21a Outer surface 21b Inner surface 22 The Second Realm 22a Outer surface 22b Inner surface 23 Opening 30 Seal Bar 31 Seal Inhibitor Plate

Claims

1. a bag body 10 formed by a first side sheet 11 and a second side sheet 12 arranged opposite to each other and having an opening at the bottom; a bottom sheet 20 that is arranged between the first side sheet 11 and the second side sheet 12 at the bottom of the bag body 10 and is folded into an inverted V shape; and an outer surface 21 a of a first region 21 of the bottom sheet 20 facing the first side sheet 11 and the first side sheet 11 are heat-sealed in a sealing region 11 s; At least a portion of the space between the outer surface 22a of the second region 22 of the bottom sheet 20 facing the second side sheet 12 and the second side sheet 12 is not sealed, forming an opening 23 that connects the inside and outside of the bag body 10, The bottom sheet 20 is folded in an inverted V shape, and the inner surface 21b of the first region 21 and the inner surface 22b of the second region 22, which face each other, are heat-sealed in a sealing region 20s. A manufacturing method of a packaging bag 1, inserting a seal inhibiting plate (31) into a region that forms the opening (23) between the outer surface (22a) of the bottom sheet (20) and the second side sheet (12); a step of heating positions corresponding to the seal areas 11s and 20s between the first side sheet 11 and the second side sheet 12 with a seal bar 30 to form the seal areas 11s and 20s; have A method for manufacturing a packaging bag 1.

2. The seal inhibiting plate 31 is a metal plate. A method for manufacturing the packaging bag 1 according to claim 1.

3. The seal strength between the inner surface 21b and the inner surface 22b at 100°C is 0.5 N / 15 mm or more. A method for manufacturing the packaging bag 1 according to claim 1.

4. The seal strength between the inner surface 21b and the inner surface 22b at 25°C is 0.5 to 30 N / 15 mm. A method for manufacturing the packaging bag 1 according to claim 1.

5. The layers constituting the inner surface 21b and the inner surface 22b are both formed of polyvinylidene chloride. A method for manufacturing the packaging bag 1 according to claim 1.

6. An unsealed area 20x is provided at the lower end between the inner surface 21b and the inner surface 22b. A method for manufacturing the packaging bag 1 according to claim 1.

7. The lower end between the outer surface 21a and the first side sheet 11 has an unsealed area 11x. A method for manufacturing the packaging bag 1 according to claim 1.

8. The outer surface 22a is heat-sealable to the second side sheet 12. A method for manufacturing the packaging bag 1 according to claim 1.

9. A step of obtaining a packaging bag 1 by the method according to any one of claims 1 to 8; a step of filling the contents 2 into the bag body 10 through the opening 23 of the packaging bag 1; a step of sealing a seal area 12s between the outer surface 22a and the second side sheet 12 to seal the interior of the bag body 10; have The method of manufacturing the article.

10. The outer surface 22a and the second side sheet 12 have an unsealed area 12x at the lower end. A method for producing the article of claim 9.

11. The seal between the inner surface 21b and the inner surface 22b can be peeled off to make the sheet self-standing. A method for producing the article of claim 9.

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