Method for manufacturing packaging bag and packaging bag

Abstract

To provide a method for manufacturing a packaging bag which hardly causes leakage of contents, and the packaging bag.SOLUTION: A method for manufacturing a packaging bag according to an embodiment is a step of manufacturing an intermediate having first to third surface parts, the first surface part having a first flap region and a first side 1a bag main body region, the method including: The second surface portion includes a first flap region, a second flap region constituting a first portion of the intermediate body, and a first side 2a bag main body region, the third surface portion includes the first side 1a bag main body region, a second side 1b bag main body region constituting a second portion of the intermediate body, the third side 2a bag main body region, and a second side 2b bag main body region constituting a third portion of the intermediate body, and the method includes a step of forming a vapor release portion in the intermediate body, a step of forming seal portions at both side edge portions of the first to third portions in a state where the third portion is tilted toward the second portion so that the first side 2b bag main body region comes into contact with the second side 1b bag main body region, and a folding step of folding the second portion toward the first portion so that the second side 2a bag main body region comes into contact with the first flap region.SELECTED DRAWING: Figure 11

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing a packaging bag and a packaging bag. [Background technology]

[0002] Patent Document 1 discloses a packaging bag for use in microwave cooking. The packaging described in Patent Document 1 has a peripheral seal formed by sealing three sides of two packaging films, with a zipper tape provided on the remaining side. This configuration allows consumers to insert contents such as food ingredients into the packaging bag through the zipper tape and seal it. After cooking, consumers can also remove the contents such as food ingredients through the zipper tape. In the packaging described in Patent Document 1, the two packaging films are formed with a seam seal that protrudes outward from the packaging. The seam seal is formed to have easy-open properties that allow the pressure inside the packaging to be released when the pressure increases during cooking. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-104813 Summary of the Invention [Problem to be solved by the invention]

[0004] In the package disclosed in Patent Document 1, a zipper tape is provided on the bag body (a portion other than the seam seam) in which the contents are stored. Therefore, for example, if the contents are liquid, there is a risk that the contents may leak from the zipper tape.

[0005] An object of one aspect of the present invention is to provide a method for manufacturing a packaging bag that is less likely to leak its contents, and the packaging bag. [Means for solving the problem]

[0006] [1] A method for manufacturing a packaging bag according to one aspect of the present invention is a method for manufacturing a flat-type packaging bag that contains contents to be heated and cooked in a microwave oven, comprising: An intermediate manufacturing process for manufacturing an intermediate having a first surface portion, and a second surface portion and a third surface portion that are disposed on the same side of the first surface portion and along a first predetermined direction, the first surface portion has a first flap region and a 1a bag main body region arranged along the first predetermined direction, the second surface portion has a second flap region that faces the first flap region and that, together with the first flap region, constitutes a first portion of the intermediate body, and a second a bag main body region that is bent toward the opposite side of the first surface portion relative to the second flap region, the third surface portion has a 1b bag body region that faces the 1a bag body region and that, together with the 1a bag body region, constitutes a second portion of the intermediate body, and a 2b bag body region that is bent in a direction opposite to the first surface portion so as to face the 2a bag body region with respect to the 1b bag body region and that, together with the 2a bag body region, constitutes a third portion of the intermediate body, a first end of the first portion is closed; A zipper tape is attached between the first flap region and the second flap region, Among the first surface portion, the second surface portion, and the third surface portion, the inner surfaces of the intermediate body are heat-sealed surfaces. the intermediate production step; a steam release portion forming step of forming a steam release portion in the intermediate body; a side edge sealing step of forming a seal in each of the first part, the second part, and the third part by sealing both side edges of the first part, the second part, and the third part in a second predetermined direction intersecting the first predetermined direction, while the third part is folded down toward the second part so that the 2b bag main body region is in contact with the 1b bag main body region; a folding step of folding the second portion toward the first portion with respect to the intermediate product that has been subjected to the side edge sealing step and the steam release portion forming step so that the seconda bag main body region contacts the first flap region; Equipped with.

[0007] In the above manufacturing method, by performing the folding step, a packaging bag can be manufactured in which the second and third parts form a bag body and the first part is a flap for the bag body. In the packaging bag manufactured in this manner, a zipper tape is provided on the first part corresponding to the flap. Therefore, even when contents are placed in the packaging bag, the contents are less likely to leak.

[0008] [2] In the method for manufacturing a packaging bag described in [1] above, in the vapor release portion forming step, the vapor release portion may be formed by crushing a part of the zipper tape.

[0009] [3] In the method for manufacturing a packaging bag described in [1] or [2] above, the intermediate manufacturing step may further include a watertight seal forming step of forming a watertight seal in the first part so as to separate the zipper tape from the second part and the third part until the zipper tape is first opened.

[0010] [4] In the method for manufacturing a packaging bag described in [3] above, the zipper tape has a first zipper member fixed to one of the first flap region and the second flap region, and a second zipper member fixed to the other of the first flap region and the second flap region, the first zipper member and the second zipper member are formed to interlock with each other, one end of a watertight film for forming the watertight seal portion is fixed to the first zipper member, and in the watertight seal portion forming step, an end region including the other end of the watertight film may be releasably joined to the other of the first flap region and the second flap region.

[0011] [5] In the method for producing a packaging bag according to any one of [1] to [4] above, the intermediate production step is a folding step of folding a sheet of film having a first heat-sealed surface so that the first heat-sealed surface faces inward and so as to form the first portion, the second portion, and the third portion, wherein the first leading end of the first portion and the second leading end of the second portion are folded portions of the film, and the first heat-sealed surfaces of the film in regions corresponding to the 2a bag main body region and the 2b bag main body region face each other. a third tip sealing step of sealing a third tip of the third portion; a first tip opening step of cutting the first tip to open the first tip; a supply port forming step of forming a supply port in the second tip by opening the second tip to supply a part of the contents to the second portion; a zipper tape attaching step of attaching a zipper tape to the first portion from which the first tip has been opened; and a first tip sealing step, which is performed after the zipper tape attaching step, of sealing the opened first tip.

[0012] [6] The method for manufacturing a packaging bag described in [5] above may further include a supply step of supplying a portion of the contents from the supply port to the second portion after the folding step, and a supply port sealing step of sealing the supply port after the supply step.

[0013] [7] In the method for manufacturing a packaging bag according to any one of [1] to [4] above, the intermediate manufacturing step includes a folding step of folding a sheet of film having a first heat-sealed surface so that the first heat-sealed surface faces inward to form the first portion, the second portion, and the third portion, wherein the first tip end of the first portion and the second tip end of the second portion are folded portions of the film, and the first heat-sealed surfaces of the film in regions corresponding to the 2a bag main body region and the 2b bag main body region face each other; and a first tip end opening step of opening the first tip end. The method may include a zipper tape attaching step of attaching a zipper tape to the first portion with the first tip opened, a second tip opening step of opening the second portion, a gusset forming step of attaching a gusset forming film having a second heat-sealed surface and a gusset region for forming a gusset, the gusset region of the gusset forming film being folded so that the second heat-sealed surface faces outward, to the second portion opened in the second tip opening step so that the gusset region closes the second portion, and a first tip sealing step, which is a step performed after the zipper tape attaching step, of sealing the cut first tip.

[0014] [8] The method for manufacturing a packaging bag described in [7] above may further include a supplying step of supplying a portion of the contents from a third tip of the third part to the second part after the folding step, and a third tip sealing step of sealing the third tip after the supplying step.

[0015] [9] In the method for manufacturing a packaging bag according to any one of [1] to [4] above, the intermediate manufacturing process may include a film positioning process in which a first film and a second film having a first heat-sealed surface are positioned so that the first heat-sealed surfaces face each other, and the second film is positioned opposite the first film in a state in which a part of the intermediate formation region of the second film is folded away from the first film so as to form the first portion, the second portion, and the third portion in the intermediate formation region of the first film and the second film; a zipper tape attaching process in which a zipper tape is attached to the first portion; and a first tip sealing process in which the first tip is sealed.

[0016]

[10] In the method for manufacturing a packaging bag described in [9] above, the intermediate manufacturing process may include a third tip sealing process for sealing a third tip of the third portion between the film placement process and the zipper tape attachment process.

[0017]

[11] The method for manufacturing a packaging bag described in [9] or

[10] above may further include a supplying step of supplying a portion of the contents from a second tip of the second part to the second part after the folding step is performed, and a second tip sealing step of sealing the second tip after the supplying step.

[0018]

[12] In the method for manufacturing a packaging bag described in any of [9] to

[11] above, two intermediate formation regions are set in the first film and the second film along the first predetermined direction, and in the intermediate manufacturing process, the steam release section forming process, the side edge sealing process, and the folding process are performed on two intermediates that are located in the two intermediate formation regions in the first predetermined direction and are symmetrical in an imaginary plane perpendicular to the first predetermined direction, and the two intermediates that have undergone the steam release section forming process, the side edge sealing process, and the folding process may be separated.

[0019]

[13] The method for manufacturing a packaging bag described in [9] above may further include a supply port forming step of forming a supply port in the third tip of the third part by opening the third tip, for supplying a portion of the contents to the second part, and the intermediate manufacturing step may include a gusset forming step of attaching a gusset forming film having a second heat-sealed surface and a gusset region for forming a gusset, the gusset forming film being in a state where the gusset region portion is folded so that the second heat-sealed surface is on the outside, to the second part so that the gusset region closes the second part.

[0020]

[14] The method for manufacturing a packaging bag described in

[13] above may further include a supply step of supplying a portion of the contents from the supply port to the second portion after the folding step is performed, and a supply port sealing step of sealing the supply port after the supply step.

[0021]

[15] In the method for manufacturing a packaging bag described in

[13] or

[14] above, two intermediate formation regions are set in the first predetermined direction on the first film and the second film, and in the intermediate manufacturing process, intermediates are manufactured in the two intermediate formation regions, positioned between the two intermediate formation regions in the first predetermined direction and symmetrical with respect to an imaginary plane perpendicular to the first predetermined direction, and the steam release section forming process, the side edge sealing process, and the folding process are performed on the two intermediates, and the two intermediates that have undergone the steam release section forming process, the side edge sealing process, and the folding process may be separated.

[0022]

[16] A packaging bag according to another aspect of the present invention is a flat-type packaging bag for use in cooking by a microwave oven, comprising: a bag body for containing contents to be cooked by a microwave oven; and a flap having a first side film portion and a second side film portion opposed to each other and connected to the bag body, wherein the bag body has a first body portion having a first surface film and a first bottom film portion that are continuously connected to the first side film at the boundary between the bag body and the flap, and a second body portion adjacent to the first body portion along a first direction, the second body portion having a second surface film that is continuously connected to the second side film portion at the boundary between the bag body and the flap and a second bottom film portion that is continuously connected to the first bottom film, wherein the first bottom film portion and the second bottom film portion are a common bottom film portion, and the first body portion has a first bottom film portion that is continuously connected to the second side film portion at the boundary between the bag body and the flap. a first tip end portion of the flap that is located opposite the second body portion in the bag body direction and that is along a second direction intersecting with the first direction is closed, a pair of first side edges of the first body portion are sealed, a pair of second side edges of the second body portion are sealed, and the extending directions of the pair of first side edges and the pair of second side edges intersect with the second direction; a second tip end portion of the flap that is located opposite the bag body and that is along the second direction is closed, a pair of third side edges of the flap are sealed, and the extending direction of the pair of third side edges intersects with the second direction when the flap is viewed from the thickness direction of the flap; and a zipper tape is provided on the flap.

[0023] The packaging bag has a bag body and a flap, and the flap is provided with a zipper tape, so that even when contents are placed in the packaging bag, the contents are less likely to leak.

[0024]

[17] In the packaging bag described in

[16] above, linear marks may be formed along the second direction in at least the pair of second side edge portions of the second body portion at a position corresponding to the first tip portion when the first body portion is folded back toward the second body portion relative to the boundary portion.

[0025]

[18] In the packaging bag described in

[16] or

[17] above, the flap may be formed with a watertight seal portion for separating the zipper tape from the bag body. [Effects of the Invention]

[0026] According to the present invention, a method for manufacturing a packaging bag that is less likely to leak contents, and a packaging bag can be provided. [Brief explanation of the drawings]

[0027] [Figure 1] FIG. 1 is a plan view of the packaging bag according to this embodiment as viewed from the front side. [Figure 2] FIG. 2 is a plan view of the packaging bag shown in FIG. 1 as seen from the bottom. [Figure 3] FIG. 3 is a perspective view of the packaging bag shown in FIG. [Figure 4] FIG. 4 is a plan view of a packaging bag containing a first content, which is a part of the content to be cooked. [Figure 5] FIG. 5 is a diagram for explaining the zipper tape and the watertight seal portion. [Figure 6] FIG. 6 is a schematic diagram showing an example of the structure of the film that forms the packaging bag shown in FIG. [Figure 7] FIG. 7 is a diagram for explaining an intermediate produced in an intermediate production step included in the method for producing a packaging bag shown in FIG. [Figure 8] FIG. 8 is a plan view of the intermediate body shown in FIG. [Figure 9] FIG. 9 is a diagram illustrating the steam release portion forming step included in the method for producing the packaging bag shown in FIG. [Figure 10] FIG. 10 is a diagram for explaining a side edge sealing step included in the method for producing the packaging bag shown in FIG. [Figure 11] FIG. 11 is a diagram for explaining a folding step included in the method for producing the packaging bag shown in FIG. [Figure 12] FIG. 12 is a diagram for explaining a bending step included in a first example of an intermediate manufacturing process for manufacturing the intermediate shown in FIG. [Figure 13] FIG. 13 is a diagram for explaining a third leading end sealing step included in the first example of the intermediate body manufacturing process for manufacturing the intermediate body shown in FIG. [Figure 14] FIG. 14 is a diagram for explaining a first tip opening step and a supply port forming step included in a first example of the process for producing the intermediate shown in FIG. [Figure 15] FIG. 15 is a diagram for explaining a zipper tape attaching step included in a first example of an intermediate manufacturing process for manufacturing the intermediate shown in FIG. [Figure 16] FIG. 16 is a diagram for explaining a watertight seal forming step included in a first example of an intermediate manufacturing process for manufacturing the intermediate shown in FIG. [Figure 17] FIG. 17 is a diagram for explaining a film disposing step included in a second example of the intermediate manufacturing process for manufacturing the intermediate shown in FIG. [Figure 18] FIG. 18 is a diagram for explaining a film disposing step and a zipper tape attaching step included in a second example of the intermediate manufacturing process for manufacturing the intermediate shown in FIG. [Figure 19] FIG. 19 is a diagram for explaining a watertight seal forming step and a first tip sealing step included in a second example of the intermediate manufacturing process for manufacturing the intermediate shown in FIG. [Figure 20] FIG. 20 is a diagram for explaining a folding step when the intermediate shown in FIG. 7 is manufactured using the second example of the intermediate manufacturing steps. [Figure 21] Figure 21(a) is a drawing showing one step in a method of using a packaging bag, Figure 21(b) is a drawing showing a step after the step shown in Figure 21(a) in a method of using a packaging bag, Figure 21(c) is a drawing showing a step after the step shown in Figure 21(b) in a method of using a packaging bag, and Figure 21(d) is a drawing showing a step after the step shown in Figure 21(c) in a method of using a packaging bag. [Figure 22]Figure 22(a) is a drawing showing a step after the step shown in Figure 21(d) in a method of using a packaging bag, and Figure 22(b) is a drawing showing a step after the step shown in Figure 22(a) in a method of using a packaging bag. [Figure 23] FIG. 23 is a schematic diagram showing the arrangement of a plurality of packaging bags when the plurality of packaging bags are conveyed. [Figure 24] FIG. 24 is a schematic diagram showing the arrangement of a plurality of packaging bags when conveying the plurality of packaging bags in the reference example. [Figure 25] FIG. 25 is a diagram for explaining an example of how a dropping impact is transmitted when a packaging bag is dropped. [Figure 26] FIG. 26 is a plan view of a packaging bag according to a modified example, as viewed from the front. [Figure 27] FIG. 27 is a plan view of the packaging bag shown in FIG. 26 as seen from the bottom. [Figure 28] FIG. 28 is a plan view of the packaging bag shown in FIG. 26 when a first content, which is a part of the content to be cooked, is contained therein. [Figure 29] FIG. 29 is a diagram for explaining an intermediate produced in a third example of the intermediate production step included in the method for producing a packaging bag shown in FIG. [Figure 30] FIG. 30 is a diagram for explaining an intermediate produced in a fourth example of the intermediate production step included in the method for producing a packaging bag shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0028] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The same elements are given the same reference numerals. Duplicate explanations will be omitted. The dimensional ratios of the drawings do not necessarily match those in the description.

[0029] Fig. 1 is a front view of a packaging bag 1 according to this embodiment. Fig. 2 is a back view of the packaging bag 1 shown in Fig. 1. Fig. 3 is a perspective view of the packaging bag 1. Figs. 1 and 2 are drawings showing a state in which a flap 12 of the packaging bag 1 is folded down toward a first body portion 11A of a bag body 11 of the packaging bag 1. Fig. 3 is a drawing showing a state in which the flap 12 is raised up relative to the bag body 11 of the packaging bag 1. Fig. 4 is a plan view of the packaging bag 1 in a state in which a first content 2a, which is part of the content to be cooked, is contained therein.

[0030] The packaging bag 1 is a flat-laying (or horizontal-laying) packaging bag for cooking contents 2 (see Figures 4, 21(c) and 21(d)) contained in the packaging bag 1 in a microwave oven. When the packaging bag 1 of this embodiment is sold in stores, it contains first contents 2a (see Figure 4), which are part of the contents 2 to be cooked. An example of the first contents 2a is a cooking seasoning liquid. Hereinafter, the packaging bag 1 containing the first contents 2a may also be referred to as packaging bag 1A (see Figure 4).

[0031] A consumer who purchases the packaging bag 1A places the second contents 2b (see Figures 21(c) and 21(d)) that constitute the contents to be cooked together with the first contents 2a into the packaging bag 1A, and then cooks the contents (first contents 2a and second contents 2b) in a microwave oven. The second contents 2b are, for example, ingredients such as fish or meat, or toppings. The second contents 2b may also include raw eggs, vegetables, etc.

[0032] The packaging bag 1 shown in Figs. 1 to 4 is manufactured by making a bag using a film 10. The film 10 used in the packaging bag 1 (packaging bag 1A) will be described with reference to Fig. 6. Fig. 6 is a diagram for explaining an example of the film 10 that forms the packaging bag 1.

[0033] [film] The film 10 is a laminated film having a sealant layer F1 and a resin substrate layer F2 laminated on the sealant layer F1. In the film 10, the surface formed by the sealant layer F1 constitutes the inner surface of the packaging bag 1. Therefore, in the film 10, the surface formed by the sealant layer F1 is referred to as the inner surface 10a. The inner surface 10a is a heat-sealable surface (first heat-sealable surface) having heat-sealing properties.

[0034] The sealant layer F1 may be made of a thermoplastic resin, such as a polyolefin resin, such as low-density polyethylene resin (LDPE), medium-density polyethylene resin (MDPE), or linear low-density polyethylene resin (LLDPE).

[0035] The sealant layer F1 may be made of an ethylene-based resin, a polypropylene-based resin, or a blend of polyethylene and polybutene. Examples of the ethylene-based resin include ethylene-vinyl acetate copolymer (EVA), ethylene-α-olefin copolymer, and ethylene-methacrylic acid copolymer. Examples of the polypropylene-based resin include homopolypropylene resin (PP), propylene-ethylene random copolymer, propylene-ethylene block copolymer, and propylene-α-olefin copolymer.

[0036] A plastic film can be used as the resin substrate layer F2. Examples of materials for the resin substrate layer F2 include polyolefins (polyethylene, polypropylene, etc.), polyesters (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polyamides (nylon-6, nylon-66, etc.), and polyimides. The material for the resin substrate layer F2 is appropriately selected depending on the application of the packaging bag 1. A uniaxially or biaxially stretched plastic film may be used as the resin substrate layer F2.

[0037] The resin substrate layer F2 is preferably made of polypropylene or polyethylene terephthalate in terms of film strength and cost. The resin substrate layer F2 is preferably made of a stretched polyamide film, which can impart toughness to the film 10 against punctures and impacts.

[0038] The film 10 may have layers other than the sealant layer F1 and the resin substrate layer F2. For example, the film 10 may have an opaque layer that blocks ultraviolet light, such as a colored film, for the purpose of improving the shelf life of a portion of the contents to be cooked in a microwave oven (the first contents 2a described below). The film 10 may have a gas barrier layer. The film 10 may have a gas barrier film formed by providing a gas barrier layer on the surface of a plastic film.

[0039] When the film 10 has the gas barrier film, the plastic film of the gas barrier film may be a film formed from a polymer resin composition. Examples of materials for the plastic film of the gas barrier film include polyolefins (polyethylene, polypropylene, etc.), polyesters (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polyamides (nylon-6, nylon-66, etc.), and polyimides, and the material is selected appropriately depending on the application. Polypropylene, polyethylene terephthalate, etc. are more preferable as the material for the plastic film of the gas barrier film from the viewpoints of film strength and cost.

[0040] The gas barrier layer of the gas barrier film can be composed of a vapor-deposited layer of an inorganic compound, a layer formed by a wet coating method, etc. For example, the gas barrier film can be obtained by providing an anchor coat on the plastic film of the gas barrier film, and then providing a vapor-deposited layer and a wet-coating layer in that order.

[0041] The anchor coat layer can be made of, for example, urethane acrylate. The anchor coat layer can be formed by forming a coating film using a coating method that applies a printing technique such as gravure coating using a paint in which a resin is dissolved in a solvent, or by forming a coating film using other commonly known coating methods.

[0042] The vapor-deposited layer can be formed by coating an inorganic compound such as SiO or AlO onto the plastic film constituting the gas barrier film using a vacuum vapor deposition method. The thickness of the vapor-deposited layer can be 15 nm or more and 30 nm or less.

[0043] An inorganic processed product layer (hereinafter referred to as a "second inorganic compound layer") may be formed by wet coating on the inorganic compound layer (hereinafter referred to as a "first inorganic compound layer") formed by the vacuum deposition method. In this way, a laminate formed by the first inorganic compound layer and the second inorganic compound layer may be used as a gas barrier layer.

[0044] When a gas barrier layer is formed by laminating a first inorganic compound layer and a second inorganic compound layer, a reaction layer between the first inorganic compound layer and the second inorganic compound layer is generated at the interface between the two layers, or the second inorganic compound layer fills or reinforces defects or micropores such as pinholes, cracks, and grain boundaries that occur in the first inorganic compound layer, thereby forming a dense structure.

[0045] Therefore, the gas barrier film can achieve high gas barrier properties, moisture resistance, and water resistance, and also has flexibility that allows it to withstand deformation due to external forces, making it suitable for use as a packaging material.

[0046] When SiO, for example, is used as the gas barrier layer, the coating is transparent, so that the contents can be seen from the outside of the packaging bag 1. These may be used appropriately depending on the application and required quality. When a printed layer is provided on the film 10, it is possible to provide a portion of the film 10 without the printed layer, and use the portion without the printed layer as a window.

[0047] The film 10 may have a printed layer for the purposes of improving the image of the product, displaying necessary information for the first content 2a, improving the design, etc. The printed layer can be provided in a position on the film 10 that is visible from the outside of the packaging bag 1. The printed layer may be provided in a position on the film 10 that is the outermost surface of the packaging bag 1. The printed layer may be provided in a portion of the film 10 that corresponds to a part of the packaging bag 1, or may be provided on the entire film 10.

[0048] There are no particular restrictions on the printing method and printing ink for forming the printed layer, and the printing method and printing ink may be selected from known printing methods taking into consideration printability on the layer on which the printed layer is to be formed, design properties such as color tone, adhesion, safety as a food packaging bag, and the like.

[0049] Examples of the printing method include gravure printing, offset printing, gravure offset printing, flexographic printing, silk screen printing, and inkjet printing.

[0050] The layers of film 10 may be joined by methods known in the art, such as adhesives, plastic layers for extruded lamination, etc.

[0051] Next, an example of the configuration of a packaging bag 1 using film 10 will be described with reference to FIGS. [Packaging bag] The packaging bag 1 has a bag body 11 having an internal space for accommodating contents to be cooked in a microwave oven, and a flap 12 connected to the bag body 11. In the packaging bag 1, the side of the bag body 11 on which the flap 12 is arranged is referred to as the surface (or front), and the side of the bag body 11 on which the flap 12 is not arranged is referred to as the bottom (or back or rear).

[0052] <Bag body> The bag body 11 is a flat, cylindrical body that is closed on three sides when viewed from the top (or bottom). The bag body 11 has a first body portion 11A and a second body portion 11B along a first direction. The first body portion 11A and the second body portion 11B are two portions of the bag body 11 that are separated by a boundary portion 13 with the flap 12. The internal space of the first body portion 11A and the internal space of the second body portion 11B are connected.

[0053] First body portion 11A has first bottom film portion 111A (see FIG. 2) and first top film portion 112A. First bottom film portion 111A and first top film portion 112A are portions of film 10 that make up first body portion 11A.

[0054] The first body portion 11A has a first tip portion 11a, a side edge portion 11b, and a side edge portion 11c. The first tip portion 11a is the end of the first body portion 11A located opposite the second body portion 11B in the first direction, and extends in a second direction intersecting the first direction. The side edge portions 11b and 11c are a pair of side edges (a pair of first side edges) of the first body portion 11A when the first body portion 11A is viewed from above, and extend along the first direction.

[0055] In the following description, the second direction is perpendicular to the first direction. The first and second directions may also be referred to as the Y and X directions shown in FIG. 1. A plan view of the first body section 11A refers to a view of the first body section 11A from the front side or first front film section 112A side, or from the bottom side (rear side) or first bottom film section 111A side. A plan view of the first body section 11A corresponds to a view of the first body section 11A from the thickness direction.

[0056] First body portion 11A has sealed portion 11Sa formed by sealing first tip portion 11a, and sealed portions 11Sb and 11Sc formed by sealing side edge portions 11b and 11c. Sealed portions 11Sa, 11Sb, and 11Sc are formed by heat-sealing (thermal fusing) first bottom film portion 111A and first surface film portion 112A. Sealed portions 11Sb and 11Sc extend from both ends of sealed portion 11Sa toward second body portion 11B.

[0057] The first body portion 11A is a portion used to remove the contents 2 after cooking the contents 2 using the packaging bag 1 (packaging bag 1A) containing the contents 2. When removing the contents 2, the consumer opens the first body portion 11A by cutting (or breaking) a portion of the first body portion 11A near the seal portion 11Sa. For this purpose, an opening trigger portion 21 may be formed in at least one of the side edge portion 11b and the side edge portion 11c near the seal portion 11Sa. In the packaging bag 1 described in this embodiment, the opening trigger portion 21 is formed in each of the side edge portion 11b and the side edge portion 11c. The opening trigger portion 21 is a portion that serves as the starting point for opening, and is, for example, a notch.

[0058] The first body portion 11A may have an opening guide line formed thereon that extends continuously in the X direction from the opening trigger portion 21. The opening guide line is a line that supports (or guides) the opening when the first body portion 11A is torn and opened. The opening guide line may be formed on at least one of the first bottom film portion 111A and the first surface film portion 112A.

[0059] An example of an opening guide line is an easy-open mechanism (or a fragile portion) that allows first body portion 11A to be torn with fingers. The easy-open mechanism may be a mechanism known in the art. The easy-open mechanism may be realized, for example, by half-cutting at least one of first bottom film portion 111A and first surface film portion 112A, or by utilizing the molecular orientation of film 10.

[0060] The second body portion 11B has a second bottom film portion 111B (see FIG. 2) and a second top film portion 112B. The second bottom film portion 111B and the second top film portion 112B are the portions of the film 10 that make up the second body portion 11B. The second bottom film portion 111B is continuously connected to the first bottom film portion 111A. The second bottom film portion 111B, together with the first bottom film portion 111A, constitutes the bottom film portion 111 that corresponds to the bottom of the packaging bag 1. In other words, the portion of the bottom film portion 111 that is included in the first body portion 11A is the first bottom film portion 111A, and the portion that is included in the second body portion 11B is the second bottom film portion 111B.

[0061] The second body portion 11B has a second tip portion 11d, a side edge portion 11e, and a side edge portion 11f. The second tip portion 11d is the end of the second body portion 11B located opposite the first body portion 11A in the first direction, and extends in the X direction (second direction). The side edge portions 11e and 11f are a pair of side edges (a pair of second side edges) of the second body portion 11B when the second body portion 11B is viewed from above, and extend along the Y direction (first direction).

[0062] The plan view of second body section 11B refers to the view of second body section 11B from the front side or second front film section 112B side, or from the bottom (rear) side or second bottom film section 111B side. The plan view of second body section 11B corresponds to the view of second body section 11B from the thickness direction.

[0063] Second body portion 11B has sealed portions 11Se and 11Sf formed by sealing side edge portions 11e and 11f. Sealed portions 11Se and 11Sf are formed by heat-sealing (thermal fusing) second bottom film portion 111B and second surface film portion 112B. Sealed portions 11Se and 11Sf extend from both ends of second tip portion 11d toward first body portion 11A.

[0064] In sealed portion 11Se and sealed portion 11Sf, a linear mark (hereinafter referred to as "linear mark 16") is formed along the X direction at the position of first tip portion 11a when first body portion 11A is folded back toward second body portion 11B around boundary portion 13. Specifically, linear mark 16 is formed at a position where distance L1 from linear mark 16 to boundary portion 13 is substantially the same as distance L2 from boundary portion 13 to first tip portion 11a. Linear mark 16 is a mark caused when the portion corresponding to first body portion 11A is pressed against the portion corresponding to second body portion 11B during the manufacturing process of packaging bag 1.

[0065] In the packaging bag 1 shown in Figures 1 to 3, the second tip 11d is open. The open second tip 11d functions as a supply port 14 for filling the first contents 2a into the second body portion 11B, and the internal space of the second body portion 11B functions as a space for storing the first contents 2a. Supplying the first contents 2a from the supply port 14 to the second body portion 11B is sometimes referred to as "filling the first contents 2a." The second tip 11d is sealed after the first contents 2a have been filled into the second body portion 11B. Therefore, the packaging bag 1A has a sealed portion 11Sd formed by sealing the second tip 11d.

[0066] In bag body 11, second body 11B is a portion that accommodates contents 2 (first contents 2a and second contents 2b) during cooking, and first body 11A is a portion from which contents 2 are removed after cooking. From the viewpoint of ensuring space in second body 11B for accommodating contents 2, distance L3 from boundary 13 to second tip 11d may be longer than distance L2 from boundary 13 to first tip 11a.

[0067] <Flap> The flap 12 functions as an insertion portion through which the consumer inserts the second contents 2b into the second body portion 11B. The flap 12 is fin-shaped relative to the bag body 11. The flap 12 has a first side film portion 121A (see FIG. 5) and a second side film portion 121B that face each other. The first side film portion 121A is part of the film 10 and is continuously connected to the first surface film portion 112A. The second side film portion 121B is part of the film 10 and is continuously connected to the second surface film portion 112B.

[0068] The flap 12 has a tip portion 12a, a side edge portion 12b, and a side edge portion 12c. The tip portion 12a is the end of the flap 12 opposite the bag body 11 and extends in the X direction. The side edge portions 12b and 12c extend in a direction intersecting the X direction when the flap 12 is viewed in a plan view. In this embodiment, the side edge portions 12b and 12c are each perpendicular to the extension direction of the tip portion 12a. The plan view of the flap 12 refers to the flap 12 viewed from the first side film portion 121A (or the second side film portion 121B). The plan view of the flap 12 corresponds to the flap 12 viewed in the thickness direction. The side edge portions 12b and 12c are a pair of side edges (a pair of third side edges) of the flap 12.

[0069] The flap 12 has a sealed portion 12Sa formed by sealing the tip portion 12a, and sealed portions 12Sb and 12Sc formed by sealing the side edge portions 12b and 12c. The sealed portions 12Sa, 12Sb, and 12Sc are formed by heat-sealing the first side film portion 121A and the second side film portion 121B. The sealed portion 12Sb is connected to the sealed portion 11Sb and the sealed portion 11Se. The sealed portion 12Sc is connected to the sealed portion 11Sc and the sealed portion 11Sf.

[0070] 1, the distance L4 from the boundary 13 to the tip 12a may be shorter than the distance L2 from the boundary 13 to the first tip 11a. In other words, the flap 12 may be smaller in size than the first body 11A when viewed in plan.

[0071] The flap 12 has a zipper tape 30 between the tip 12a (or the seal portion 12Sa) and the boundary portion 13. The flap 12 may have an opening trigger portion 22 formed between the tip 12a and the zipper tape 30 at at least one of the side edge portions 12b and 12c, or may have a watertight seal portion 40 formed between the zipper tape 30 and the boundary portion 13. In this embodiment, a case will be described in which the opening trigger portion 22 is formed at each of the side edge portions 12b and 12c, and the watertight seal portion 40 is provided on the flap 12.

[0072] The opening trigger 22 is formed at a location that should be the starting point for opening the flap 12 by tearing (or breaking) it open in order to pour the second content 2b into the second body portion 11B from the flap 12. The opening trigger 22 is, for example, a notch.

[0073] The distance between the opening trigger portion 22 and the boundary portion 13 may be the same as the distance between the opening trigger portion 22 and the boundary portion 13. In this configuration, when the flap 12 is folded toward the first body portion 11A, the opening trigger portion 22 overlaps with the opening trigger portion 21. Therefore, for example, when manufacturing the packaging bag 1, the opening trigger portion 21 and the opening trigger portion 22 can be formed together.

[0074] When the size of the flap 12 is smaller than the size of the first body portion 11A (when the distance L4 is shorter than the distance L2), the opening trigger portions 21, 22 may be formed so that the positions of the opening trigger portion 21 and the opening trigger portion 22 relative to the boundary portion 13 differ when the flap 12 is folded toward the first body portion 11A. The flap 12 and the first body portion 11A have different functions, and therefore the timing for opening them also differs. When the positions of the opening trigger portion 21 and the opening trigger portion 22 relative to the boundary portion 13 differ, the opening trigger portion 21 and the opening trigger portion 22 are easy to visually recognize, so it is difficult to make a mistake in the timing for opening the first body portion 11A and the flap 12 using them, and it is easy to open the flap 12 and the first body portion 11A in the order recommended by the manufacturer that provides the packaging bag 1. In particular, it is effective that the opening trigger portion 21 is formed so that when the flap 12 is folded toward the first body portion 11A, the distance between the opening trigger portion 21 and the boundary portion 13 is longer than the distance L4.

[0075] An opening guide line may be formed on the flap 12, extending continuously in the X direction from the opening trigger portion 22. The opening guide line is a line that supports opening when the consumer tears (or breaks) the flap 12 to open it in order to put the second content 2b into the second body portion 11B. The opening guide line may be formed on at least one of the first side film portion 121A and the second side film portion 121B.

[0076] The opening guide line is an easy-open mechanism (or a weak portion) that allows the flap 12 to be torn with fingers. The easy-open mechanism may be a mechanism known in the art. The easy-open mechanism may be realized, for example, by half-cutting at least one of the first side film portion 121A and the second side film portion 121B, or by utilizing the molecular orientation of the film 10.

[0077] The zipper tape 30 is provided along the X direction (the width direction of the flap 12). The zipper tape 30 is a tape having an interlocking portion 31. The interlocking portion 31 is provided between the sealed portion 12Sb and the sealed portion 12Sc. The zipper tape 30 is a tape that can be opened and closed freely.

[0078] In the packaging bag 1 described in this embodiment, a part of the zipper tape 30 is provided with a steam release portion 15 for releasing steam generated in the packaging bag 1 (packaging bag 1A) containing the contents 2 from the packaging bag 1A during cooking in a microwave oven. The steam release portion 15 is an automatic steam release mechanism configured to automatically release steam when the pressure of steam generated in the packaging bag 1A reaches a predetermined pressure during cooking. The steam release portion 15 in this embodiment is a weak bite portion in which the zipper function (interlocking function) is reduced so that the portion of the interlocking portion 31 corresponding to the steam release portion 15 is more easily unzipped than other portions. The weak bite portion can be formed by crushing a portion of the interlocking portion 31 by heating, pressing, or the like. The steam release portion 15 may be located in the center of the zipper tape 30 in the width direction (X direction).

[0079] The watertight seal portion 40 is a portion that separates the zipper tape 30 from the internal space of the bag body 11. In this embodiment, the watertight seal portion 40 is formed by joining a portion of the watertight film 41 to the second side film portion 121B. The second side film portion 121B and the watertight film 41 may be joined by, for example, a wavy seal as shown by the dashed lines in Figures 1 and 3. The wavy seal portion shown by the dashed lines in Figures 1 and 3 is referred to as a wavy seal 42.

[0080] The watertight seal 40 has the function of preventing the first contents 2a contained in the second body 11B from coming into contact with the zipper tape 30 before the flap 12 is opened. This prevents the consumer's fingers from getting dirty when operating the zipper tape 30.

[0081] The zipper tape 30 and the watertight seal portion 40 will be further described with reference to Fig. 5. Fig. 5 is a diagram for explaining the zipper tape 30 and the watertight seal portion 40, and shows an enlarged portion of the cross section of the flap 12 perpendicular to the extending direction of the zipper tape 30.

[0082] As shown in Fig. 5, the zipper tape 30 has a strip-shaped male member (second zipper member) 32 and a strip-shaped female member (first zipper member) 33 that can be mated with the male member 32. The male member 32 and the female member 33 are formed of a thermoplastic resin. An example of the thermoplastic resin is a polypropylene-based resin. As shown in Fig. 5, a configuration will be described in which the male member 32 is fixed to the inner surface of the first side film portion 121A and the female member 33 is fixed to the inner surface of the second side film portion 121B, but the male member 32 may also be fixed to the inner surface of the second side film portion 121B and the female member 33 may also be fixed to the inner surface of the first side film portion 121A.

[0083] The male component 32 has a base 321 and an insertion portion 322. The base 321 extends in the X direction and is in the form of a film. The length of the base 321 in the X direction may be the same as the length of the flap 12 in the X direction. The base 321 is joined to the inner surface of the first side film portion 121A. The joining of the base 321 and the first side film portion 121A may be performed by, for example, heat sealing.

[0084] The base 321 may be fixed to the first side film part 121A by bonding (for example, heat sealing) the entire surface that contacts the first side film part 121A to the first side film part 121A. The base 321 may also be fixed to the first side film part 121A by bonding (for example, heat sealing) both end parts of the base 321 to the first side film part 121A in a cross section perpendicular to the extension direction (X direction) of the base 321, as in areas 321a and 321b shown by dashed lines in Fig. 5.

[0085] The insertion portion 322 extends in the X direction, just like the base 321. The insertion portion 322 is provided with respect to the base 321 so as to be positioned between the seal portion 12Sb and the seal portion 12Sc. The length of the insertion portion 322 in the X direction may be the same as the length of the base 321 in the X direction. The insertion portion 322 has a head portion 322a that is inserted into the female member 33, and a connecting portion 322b that connects the head portion 322a to the base 321. The head portion 322a and the connecting portion 322b extend in the X direction, just like the base 321. In a cross section of the male member 32 that is perpendicular to the X direction, the head portion 322a has, for example, an arrowhead shape. In a cross section of the male member 32 that is perpendicular to the X direction, the insertion portion 322 can also be referred to as a convex portion that protrudes from the base 321 in a direction opposite to the first side film portion 121A.

[0086] The female member 33 has a base 331 and a receiving portion 332. The base 331 extends in the X direction and is in the form of a film. The length of the base 331 in the X direction is the same as that of the base 321. The base 331 is joined to the inner surface of the second side surface film portion 121B. The joining of the base 331 and the second side surface film portion 121B may be performed by, for example, heat sealing.

[0087] The base 331 may be fixed to the second side film part 121B by joining (for example, heat sealing) the entire surface that contacts the second side film part 121B to the second side film part 121B. The base 331 may also be fixed to the second side film part 121B by joining (for example, heat sealing) both end parts of the base 331 to the second side film part 121B in a cross section perpendicular to the extension direction (X direction) of the base 331, as in areas 331a and 331b indicated by dashed lines in Fig. 5.

[0088] The receiving portion 332 extends in the X direction, similar to the base 331. The arrangement of the receiving portion 332 relative to the base 331 and the length in the X direction are similar to the arrangement of the insertion portion 322 relative to the base 321 and the length in the X direction. The receiving portion 332 has a recess 332a into which the head 322a is inserted.

[0089] The head 322a and the receiving portion 332 (or the recess 332a) may be configured to be capable of being mated with each other. The mating portion 31 is formed by the head 322a and the receiving portion 332 (or the recess 332a).

[0090] The bite strength (internal bite strength) of the inside of the bite portion 31 (bag body 11 side) and the bite strength (external bite strength) of the outside of the bite portion 31 (tip portion 12a side) may satisfy the relationship shown in the following formula (1). Internal occlusal strength > external occlusal strength...(1)

[0091] An engaging portion 31 that satisfies formula (1) can be achieved by configuring the head portion 322a and the receiving portion 332 so that the cross-sectional shape of the engaging portion 31 perpendicular to the extension direction (X direction) of the engaging portion 31 is asymmetric with respect to the center line α of the engaging portion 31.

[0092] When a consumer opens the zipper tape 30 after the seal portion 12Sa side of the flap 12 is torn, the consumer spreads the flap 12 by grasping the ends of the first side film portion 121A and the second side film portion 121B near the tip portion 12a. Therefore, as shown in formula (1), if the outer occlusion strength is smaller than the inner occlusion strength, the occlusion portion 31 is easily opened. When the packaging bag 1A is cooked, the zipper tape 30 is closed. During cooking, the internal pressure in the packaging bag 1A increases. As shown in formula (1), if the inner occlusion strength is greater than the outer occlusion strength, the occlusion portion 31 can be prevented from unexpectedly opening due to the internal pressure, even if the internal pressure of the packaging bag 1A increases. In other words, by satisfying formula (1), the occlusion portion 31 can be prevented from unexpectedly opening during cooking while ensuring ease of opening the zipper tape 30 when inserting the second contents 2b through the flap 12.

[0093] As shown in FIG. 5, one end of the watertight film 41 is fixed to the female member 33. Specifically, one end of the watertight film 41 is fixed to the end of the base 331 closer to the bag body 11. The watertight film 41 is an easy-peel film. An example of the material for the watertight film 41 is a polypropylene-based resin. In the watertight film 41, an end region 411 including the end opposite to the end fixed to the female member 33 is peelably bonded to the inner surface of the first side film portion 121A. The end region 411 is sealed to the first side film portion 121A in, for example, a wavy shape. In FIG. 5, the area surrounded by a dashed line is schematically shown as the area where the wavy seal 42 is formed.

[0094] The position of the zipper tape 30 on which the steam release portion 15 is formed may be adjusted so that steam can escape from the steam release portion 15 before the packaging bag 1 (packaging bag 1A) expands too much when heated in a microwave oven. The position of the zipper tape 30 is a position from the boundary portion 13 of the flap 12. For example, the distance from the boundary portion 13 to the zipper tape 30 may be half or less of the distance L4. However, if the zipper tape 30 and the associated watertight seal portion 40 are too close to the boundary portion 13, the packaging bag 1 will be susceptible to impact if dropped during transportation, for example. Therefore, the positions of the zipper tape 30 and the associated watertight seal portion 40 should be set taking these points into consideration.

[0095] [Manufacturing method of packaging bags] Next, one embodiment of a method for manufacturing the packaging bag 1 will be described with reference to Figures 7 to 11. Below, a method for manufacturing the packaging bag 1 having the zipper tape 30 and the watertight seal portion 40 described with reference to Figure 5 will be described.

[0096] The method for manufacturing the packaging bag 1 includes an intermediate manufacturing step, a steam release portion forming step, a side edge sealing step, and a folding step.

[0097] [Intermediate manufacturing process] In the intermediate manufacturing process, the intermediate 50 shown in FIGS. 7 and 8 is manufactured using at least one film 10. FIG. 7 is a diagram illustrating the configuration of the intermediate 50. FIG. 8 is a plan view of the intermediate 50 shown in FIG. 7. FIG. 8 shows the intermediate 50 in a state in which the third portion 503 of the intermediate 50 is folded toward the second portion 502. In FIG. 8, the zipper tape 30 disposed within the first portion 501 is also shown by a solid line. The hatching in FIG. 8 is used to indicate the sealed portions of the intermediate 50. In the description of the manufacturing method of the packaging bag 1, the first predetermined direction s and the second predetermined direction t shown in FIGS. 7 and 8 may be used. The second predetermined direction t is a direction intersecting the first predetermined direction s. Hereinafter, unless otherwise specified, the second predetermined direction t is perpendicular to the first predetermined direction s.

[0098] The intermediate body 50 has a first surface portion 51, a second surface portion 52, and a third surface portion 53. The first surface portion 51 has a first flap region 511 and a 1a bag main body region 512 along a first predetermined direction s. The second surface portion 52 and the third surface portion 53 are arranged along the first predetermined direction s. The second surface portion 52 has a second flap region 521 and a 2a bag main body region 522. The third surface portion 53 has a 1b bag main body region 531 and a 2b bag main body region 532. The inner surface of the intermediate body 50 is a heat-sealed surface (first heat-sealed surface).

[0099] The first flap region 511 and the second flap region 521 face each other. The first flap region 511 and the second flap region 521 constitute the first portion 501 of the intermediate body 50.

[0100] The first portion 501 is a portion corresponding to the flap 12 . The first flap region 511 is a region corresponding to the second side surface film portion 121B. The second flap region 521 is a region corresponding to the first side surface film portion 121A.

[0101] A first tip 501a of the first portion 501 is sealed. The first tip 501a is an end of the first portion 501 that is located opposite the second portion 502. The first tip 501a corresponds to the tip 12a of the flap 12. A sealed portion 12Sa is formed by sealing the first tip 501a.

[0102] The 1a-bag main body region 512 and the 1b-bag main body region 531 face each other. The 1a-bag main body region 512 and the 1b-bag main body region 531 constitute the second portion 502 of the intermediate body 50.

[0103] The second portion 502 corresponds to the second body portion 11B. The 1a bag main body region 512 is a region corresponding to the second surface film portion 112B. The 1b bag main body region 531 is a region corresponding to the second bottom film portion 111B.

[0104] Second tip 502a of second portion 502 is open. Second tip 502a is the end of second portion 502 that is located opposite first portion 501. Second tip 502a corresponds to second tip 11d of second body 11B. The open second tip 502a is supply port 14 of packaging bag 1.

[0105] The 2a bag body region 522 is a region of the second surface portion 52 that is bent away from the first surface portion 51. The 2b bag body region 532 is a region of the third surface portion 53 that is bent away from the first surface portion 51. The 2a bag body region 522 and the 2b bag body region 532 face each other. The 2a bag body region 522 and the 2b bag body region 532 constitute the third portion 503 of the intermediate body 50.

[0106] The third portion 503 corresponds to the first body portion 11A. The 2a-th bag main body region 522 is a region corresponding to the first surface film portion 112A. The second bag main body region 532 is a region corresponding to the first bottom film portion 111A.

[0107] A third tip 503a of the third portion 503 is sealed. The third tip 503a is an end of the third portion 503 that is located opposite a connection 503b (see FIG. 8) between the first portion 501 and the second portion 502 and the third portion 503. The third tip 503a corresponds to the first tip 11a of the first body portion 11A. The third tip 503a is sealed to form a seal portion 11Sa. The connection portion 503b corresponds to the boundary portion 13.

[0108] The zipper tape 30 is attached to the first portion 501. Since the first portion 501 corresponds to the flap 12, the zipper tape 30 is attached in the same manner as described with reference to FIG.

[0109] In this embodiment, a watertight seal 40 is formed in the first portion 501. The watertight seal 40 is a seal for separating the zipper tape 30 from the internal spaces of the second portion 502 and the third portion 503. Since the first portion 501 corresponds to the flap 12, the watertight seal 40 is formed in the first portion 501 in the same manner as described with reference to FIG. 5. Specifically, the watertight seal 40 is formed by joining a watertight film 41 connected to the zipper tape 30 to the second flap region 521. In the embodiment shown in FIG. 8, a wavy seal 42 is formed between the watertight film 41 and the second flap region 521.

[0110] [Steam release section formation process] In the steam release portion forming step, as shown in Fig. 9, the steam release portion 15 is formed in the intermediate body 50. Fig. 9 is a plan view of the intermediate body 50 on which the steam release portion 15 has been formed. In this embodiment, the steam release portion 15 is formed as a weak bite portion by crushing part of the bite portion 31 of the fastener tape 30 by applying pressure, heat deformation, or the like.

[0111] [Side edge sealing process] In the side edge sealing process, as shown in FIG. 9 , a pair of side edges 50a, 50b of the intermediate body 50 is sealed when the third portion 503 is folded toward the second portion 502 so that the 2b bag main body region 532 is in contact with the 1b bag main body region 531. The pair of side edges 50a, 50b are both side edges of the intermediate body 50 in the second predetermined direction t. Although the method of the sealing process is not limited, in this embodiment, the pair of side edges 50a, 50b of the intermediate body 50 is heat-sealed when the third portion 503 is folded toward the second portion 502. As a result, the inner surfaces of the pair of side edges of the first portion 501, the pair of side edges of the second portion 502, and the pair of side edges of the third portion 503 are heat-sealed.

[0112] By carrying out the side edge sealing step, as shown in Fig. 10, sealed portions 11Sb, 11Sc, 11Se, 11Sf, 12Sb, and 12Sc of the packaging bag 1 are formed on the intermediate body 50. Fig. 10 is a diagram for explaining the side edge sealing step. With the third part 503 laid down toward the second part 502, heat sealing (sealing treatment) is performed on the pair of side edges 50a, 50b of the intermediate body 50, and therefore the multiple sealed portions formed in the side edge sealing step are formed together.

[0113] During heat sealing, the pair of side edge portions 50a, 50b of the intermediate body 50 are pressed in the thickness direction, so that the seal portion 11Se and the seal portion 11Sf are left with a mark of the third tip portion 503a of the third portion 503. As a result, the line mark 16 shown in FIG. 1 is formed.

[0114] [Folding process] In the folding step, as shown in Fig. 11, the third portion 503 of the preform 50 that has undergone the side edge sealing step is folded back toward the first portion 501. In other words, the third portion 503 is inverted. Specifically, the third portion 503 is folded back toward the first portion 501 so that the outer surfaces of the 2b bag main body region 532 and the 1b bag main body region 531 form a flat surface. This produces a packaging bag 1 that has a first body portion 11A and a second body portion 11B formed by the third portion 503 and the second portion 502, and also has a flap 12 formed by the first portion 501. Fig. 11 is a diagram for explaining the folding step.

[0115] When the packaging bag 1 has the opening trigger portion 21 and the opening trigger portion 22, a step of forming the opening trigger portion 21 and the opening trigger portion 22 is carried out. For example, the step of forming the opening trigger portion 21 may be carried out between the side edge sealing step and the folding-back step, and the step of forming the opening trigger portion 22 may be carried out after the folding-back step. When the opening trigger portion 21 and the opening trigger portion 22 are formed equidistant from the connecting portion 503b (boundary portion 13), the opening trigger portions 21 and 22 may be formed simultaneously with the first portion 501 and the third portion 503 overlapping each other after the folding-back step.

[0116] When the packaging bag 1 has an opening guide line, the opening guide line may be formed in advance in the film 10 before the intermediate body 50 is formed, at a position where the opening guide line should be formed.

[0117] The timing for forming the opening trigger portions 21, 22 and the opening guide line is the same in various examples of manufacturing methods for a packaging bag (or intermediate product) described later.

[0118] In the manufacturing process of the packaging bag 1, the second tip 502a of the second portion 502 is not sealed. Therefore, the second tip 11d corresponding to the second tip 502a functions as the supply port 14. After manufacturing the packaging bag 1, the first contents 2a are supplied from the supply port 14 (supply step). Thereafter, the supply port 14 formed in the second body portion 11B (second portion 502) is sealed to obtain the packaging bag 1A (supply port sealing step). The packaging bag 1A manufactured as described above is sold as a product in stores, etc.

[0119] The intermediate manufacturing step included in the manufacturing method of the packaging bag 1 will now be described in detail.

[0120] [First example of intermediate manufacturing method] First, a case where an intermediate 50 is manufactured using one film 10 will be described. In a first example of the intermediate manufacturing process, the intermediate 50 is manufactured by folding an intermediate formation region of one film 10 that forms the intermediate 50. Below, a case where the entire film 10 is the intermediate formation region will be described. However, the intermediate formation region may be only a part of the film 10.

[0121] First, as shown in Fig. 12, film 10 is folded to form first portion 501, second portion 502, and third portion 503 (folding step). Fig. 12 is a diagram for explaining the folding step.

[0122] By folding the film 10, the first surface 51, the second surface 52, and the third surface 53 are formed in the areas of the film 10 corresponding to the first surface 51, the second surface 52, and the third surface 53. Hereinafter, for ease of explanation, the areas of the film 10 corresponding to the first surface 51, the second surface 52, and the third surface 53 will be simply referred to as the "first surface 51," the "second surface 52," and the "third surface 53," and an example of the above folding process will be explained.

[0123] (a) At the boundary between the first surface portion 51 and the second surface portion 52 of the film 10, the film 10 is folded so that the inner surface 10a of the film 10 is located on the inside and the second flap region 521 is located on the first flap region 511 of the first surface portion 51. This forms the first portion 501. The inner surface 10a is a heat-sealed surface formed by the sealant layer F1 (see FIG. 6). The boundary between the folded first surface portion 51 and second surface portion 52 is the first tip portion 501a. Therefore, at the first tip portion 501a, the first flap region 511 and the second flap region 521 are connected, and the first tip portion 501a is closed.

[0124] (b) At the boundary between the first surface portion 51 and the third surface portion 53 of the film 10, the film 10 is folded so that the inner surface 10a of the film 10 is positioned on the inside and the 1b bag body region 531 is positioned on the 1a bag body region 512 of the first surface portion 51. This forms the second portion 502. The boundary between the folded first surface portion 51 and the third surface portion 53 is the second tip portion 502a. Therefore, at the second tip portion 502a, the 1a bag body region 512 and the 1b bag body region 531 are connected, and the second tip portion 502a is closed.

[0125] (c) The second surface 52 is folded at the boundary between the second flap region 521 and the 2a bag body region 522 so that the inner surface of the 2a bag body region 522 in the second surface 52 faces the inner surface of the 2b bag body region 532 in the third surface 53, and the third surface 53 is folded at the boundary between the 1b bag body region 531 and the 2b bag body region 532. As a result, the 1b bag body region 531 and the 2b bag body region 532 are arranged facing each other in a folded manner, forming the third portion 503. At this stage, the third tip 503a of the third portion 503 is not closed.

[0126] The order of folding the film 10 described above in (a), (b), and (c) is not limited.

[0127] In the folding process, of the first bag body region 531 and the second bag body region 532 arranged opposite to each other in a palm-to-palm shape, the portions near the second flap region 521 and the first bag body region 531 may be temporarily fastened (temporarily sealed) from the viewpoint of workability in subsequent processes. The same applies to the intermediate manufacturing process described below.

[0128] In this embodiment, the above-mentioned folding process is carried out by placing a plate 60 on the first surface portion 51 of the film 10, as shown in Figure 12, and folding the film 10 along the plate 60 so that the inner surface 10a of the film 10 faces inward.

[0129] Next, as shown in Fig. 13, the third tip 503a of the third portion 503 is sealed (third tip sealing step). This forms the sealed portion 11Sa. Fig. 13 is a diagram for explaining the third tip sealing step.

[0130] After forming the sealed portion 11Sa, as shown in FIG. 14, the first tip 501a is opened (first tip opening step), and the second tip 502a is also opened to form the supply port 14 in the second tip 502a (supply port forming step). In the first tip opening step, the first tip 501a may be cut along the second predetermined direction t to open the first tip 501a. In the supply port forming step, the second tip 502a may be cut along the second predetermined direction t to open the second tip 502a. The order of the first tip opening step and the supply port forming step is not limited. FIG. 14 is a diagram for explaining the first tip opening step and the supply port forming step.

[0131] After the first tip opening step, the zipper tape 30 to which the watertight film 41 is fixed is attached to the inside of the opened first portion 501 (zipper tape attaching step), as shown in Fig. 15. Fig. 15 is a diagram for explaining the zipper tape attaching step.

[0132] In the zipper tape attaching step, the zipper tape 30 to which the watertight film 41 is fixed is placed in the first portion 501. Then, the zipper tape 30 is fixed to the first portion 501. The method of fixing the zipper tape 30 to the first portion 501 is the same as the above-mentioned description of the method of fixing the zipper tape 30 to the first side film portion 121A and the second side film portion 121B (description using FIG. 5 ), except that the first side film portion 121A and the second side film portion 121B are replaced with the first flap region 511 and the second flap region 521.

[0133] After the zipper tape attaching step, as shown in Fig. 16, the watertight film 41 is joined to the inner surface of the first part 501 to form the watertight seal part 40 (watertight seal part forming step). Fig. 16 is a diagram for explaining the watertight seal part forming step.

[0134] The watertight seal portion 40 is formed in the same manner as in the method for forming the watertight seal portion 40 described with reference to Figure 5, except that the first side film portion 121A is replaced with the second flap region 521. The end region 411 of the watertight film 41 and the second flap region 521 can be sealed by a heat plate seal. For example, the end region 411 of the watertight film 41 and the second flap region 521 are sealed by a heat plate seal formed into a wavy shape. In this case, a wavy seal 42 is formed.

[0135] After the zipper tape attaching step and the watertight seal forming step are performed, the open first tip 501a is sealed (first tip sealing step). The first tip 501a is sealed by, for example, heat sealing. This forms the sealed portion 12Sa, and the intermediate body 50 shown in FIGS. 7 and 8 is obtained.

[0136] In the first example, the intermediate 50 may be manufactured using a strip-shaped film 10 extending along the second predetermined direction t. In this case, multiple intermediate formation regions may be set on the strip-shaped film 10 along the second predetermined direction t, and each step of the intermediate manufacturing process may be performed in sequence in each intermediate formation region while the film 10 is transported along the second predetermined direction t. In this case, multiple intermediates 50 are manufactured along the second predetermined direction t. Therefore, each step after the intermediate manufacturing process, such as the steam release portion forming step, is also performed while transporting the multiple intermediates 50 along the second predetermined direction t, thereby manufacturing multiple packaging bags 1 corresponding to the multiple intermediates 50. In this case, the multiple packaging bags 1 are connected along the second predetermined direction t, and each packaging bag 1 can be obtained by separating the multiple packaging bags 1.

[0137] [Second example of intermediate manufacturing process] Next, an intermediate manufacturing process will be described for manufacturing an intermediate 50 using two films 10. The two films 10 used are referred to as a first film 10A and a second film 10B. Each of the first film 10A and the second film 10B has a heat-sealed surface (a second heat-sealed surface). The first film 10A and the second film 10B have the layer structure described with reference to FIG. 6.

[0138] First, first film 10A and second film 10B are arranged to face each other (film arrangement step) as shown in Fig. 17. Fig. 17 is a diagram for explaining the film arrangement step.

[0139] 17, a configuration will be described in which two intermediate formation regions 70 are set in the first film 10A and the second film 10B along the first predetermined direction s, and an intermediate 50 is formed in each intermediate formation region 70. When distinguishing between the two intermediate formation regions 70, the two intermediate formation regions 70 will be referred to as a first intermediate formation region 71 and a second intermediate formation region 72.

[0140] The first film 10A is a film having an area to become the first surface portion 51 in each of the first intermediate formation region 71 and the second intermediate formation region 72. The second film 10B is a film having an area to become the second surface portion 52 and the third surface portion 53 in each of the first intermediate formation region 71 and the second intermediate formation region 72. In the second example, the area to become the first surface portion 51 in the first film 10A will be simply referred to as the "first surface portion 51," and the areas to become the second surface portion 52 and the third surface portion 53 in the second film 10B will be simply referred to as the "second surface portion 52" and the "third surface portion 53."

[0141] In the first intermediate formation region 71 and the second intermediate formation region 72, an intermediate 50 is produced that is located between the first intermediate formation region 71 and the second intermediate formation region 72 in the first predetermined direction s and has a configuration symmetrical with respect to an imaginary plane P perpendicular to the first predetermined direction s. The same treatment is applied to the first intermediate formation region 71 and the second intermediate formation region 72. Therefore, hereinafter, unless otherwise specified, the treatment for the first intermediate formation region 71 will be described.

[0142] In the film arrangement step, the first film 10A and the second film 10B are arranged so that their respective heat-sealed surfaces (inner surfaces 10a shown in FIG. 6) face each other. At this time, the boundary between the second surface portion 52 and the third surface portion 53 of the second film 10B is folded in the opposite direction to the first film 10A. That is, the boundary between the second surface portion 52 and the third surface portion 53 of the second film 10B is mountain-folded. As a result, the third portion 503 is formed in the first intermediate formation region 71. The third tip portion 503a of the third portion 503 is formed by folding the second film 10B. Therefore, the 2a bag main body region 522 of the second surface portion 52 and the 2b bag main body region 532 of the third surface portion 53 are connected at the third tip portion 503a, and the third tip portion 503a is closed.

[0143] As described above, when the second film 10B is placed on the first film 10A in a folded state, in the first intermediate formation region 71, the first portion 501 is formed by the first flap region 511 of the first surface portion 51 and the second flap region 521 of the second surface portion 52, and the second portion 502 is formed by the bag main body region 1a of the first surface portion 51 and the second flap region 521 of the third surface portion 53. At this stage, the first tip 501a of the first portion 501 and the second tip 502a of the second portion 502 are open.

[0144] When the film positioning step is performed, a plate 61 may be placed between the first film 10A and the second film 10B as shown in Fig. 18. The plate 61 has a hole 61a formed in the first portion 501 at a position where the zipper tape 30 is to be attached, and the zipper tape 30 with the watertight film 41 fixed thereto is placed in the hole 61a. In one embodiment, the zipper tape 30 may be placed so that the bite portion 31 of the zipper tape 30 is positioned in the hole 61a. Fig. 18 is a diagram for explaining the film positioning step and the zipper tape attaching step.

[0145] Next, the third tip portion 503a is sealed (third tip portion sealing step), and the zipper tape 30 is attached to the first portion 501 (zipper tape attaching step). The order of performing the third tip portion sealing step and the zipper tape attaching step is not limited.

[0146] In the third tip sealing step, the third tip 503a is heat-sealed, for example. By performing the third tip sealing step, the sealed portion 11Sa is formed. The method of attaching the zipper tape 30 in the zipper tape attaching step is the same as in the first example of the intermediate manufacturing step. In the embodiment in which the plate 61 is disposed between the first film 10A and the second film 10B, the plate 61 can be used as a base during sealing, making it easy to seal the third tip 503a and attach the zipper tape 30 to the first portion 501.

[0147] After the third leading edge sealing step and the zipper tape attaching step are performed, as shown in FIG. 19, the watertight seal portion 40 is formed (watertight seal portion forming step), and the first leading edge 501a of the first portion 501 is sealed (first leading edge sealing step). FIG. 19 is a diagram for explaining the watertight seal portion forming step and the first leading edge sealing step in the second example. The order in which the watertight seal portion forming step and the first leading edge sealing step are performed is not limited. In an embodiment using the plate 61, the plate 61 is removed before the watertight seal portion forming step and the first leading edge sealing step are performed. The method for forming the watertight seal portion 40 is the same as in the first example of the intermediate manufacturing process. In the first leading edge sealing step, the first leading edge 501a is, for example, heat-sealed. By performing the first leading edge sealing step, the seal portion 12Sa is formed.

[0148] By carrying out the watertight seal forming step and the first tip sealing step, the intermediate body 50 is manufactured in the first intermediate body forming region 71.

[0149] The intermediate manufacturing process has been described with a focus on manufacturing an intermediate 50 in the first intermediate formation region 71, but in each step of the intermediate manufacturing process, similar processing is also performed on the second intermediate formation region 72. Therefore, an intermediate 50 is also manufactured in the second intermediate formation region. That is, in the second example of the intermediate manufacturing process, two intermediates 50 that are symmetrically arranged with respect to the imaginary plane P and connected to each other are manufactured.

[0150] When the intermediate manufacturing process of the second example is adopted, the side edge sealing process and the steam release portion forming process are carried out on each of the two intermediates 50 manufactured in the intermediate manufacturing process. The side edge sealing process and the steam release portion forming process carried out on each intermediate 50 are the same as those in the first example.

[0151] Thereafter, as shown in FIG. 20, a folding process is carried out in each of the intermediates 50 in the first intermediate formation region 71 and the second intermediate formation region 72, in which the third portion 503 is folded back toward the first portion 501. As a result, a packaging bag 1 is obtained from each intermediate 50. At this stage, the two packaging bags 1 produced from the two intermediates 50 are also connected. Therefore, when two connected packaging bags 1 are produced as described above, a separation process is carried out to separate the two connected packaging bags 1. FIG. 20 is a diagram for explaining the folding process when an intermediate 50 is produced using the second example.

[0152] In each packaging bag 1 obtained by carrying out the above separation step, second tip 11d of second body portion 11B corresponding to second tip 502a of second part 502 is open. Therefore, second tip 11d (second tip 502a) functions as supply port 14. Therefore, the supply port sealing step corresponds to a second tip sealing step of sealing second tip 502a of intermediate body 50.

[0153] In the second example, as in the first example, the intermediate 50 may be manufactured using two strip-shaped films 10 (first film 10A and second film 10B) extending along the second predetermined direction t.

[0154] [How to use the packaging bag] Next, using Figures 21(a), 21(b), 21(c), 21(d), 22(a), and 22(b), we will explain how a consumer who has purchased a packaging bag 1 (packaging bag 1A) containing a first content 2a uses the packaging bag 1A. Figures 21(a), 21(b), 21(c), 21(d), 22(a), and 22(b) show each step of the method of using the packaging bag 1A. Figures 21(a) to 21(d), 22(a), and 22(b) show simplified schematic diagrams of the packaging bag 1. In the packaging bag 1, the area of ​​the zipper tape 30 is shown as a black area.

[0155] As shown in FIG. 21(a), the consumer opens the flap 12 by tearing the tip 12a of the flap 12 widthwise. The consumer may tear the flap 12 with their fingers or may open the flap 12 using a blade such as scissors or a knife. After opening the flap 12, the consumer opens the zipper tape 30 as shown in FIG. 21(b). By opening the zipper tape 30, the end region 411 of the watertight film 41, which was releasably joined to the first side film portion 121A, is also peeled off from the first side film portion 121A. In this state, as shown in FIG. 21(c), the consumer places the second contents 2b into the second body portion 11B through the flap 12. Then, as shown in FIG. 21(d), the consumer closes the zipper tape 30 to seal the contents 2 (first contents 2a and second contents 2b).

[0156] As shown in FIG. 22(a), packaging bag 1 (packaging bag 1A) containing contents 2 is placed in microwave oven 3 and heated. Packaging bag 1A is placed flat (or horizontally) in microwave oven 3 so that bottom film portion 111 is in contact with a support table (such as a tray) for the heating object in microwave oven 3. When the internal pressure of packaging bag 1A reaches a predetermined pressure due to steam generated inside packaging bag 1A while the contents 2 are being cooked by microwave oven 3, steam release portion 15 opens and the steam is released from steam release portion 15 to the outside of packaging bag 1A.

[0157] After cooking in the microwave oven 3 is completed, the consumer removes the packaging bag 1A from the microwave oven 3. Then, as shown in Figure 22(b), the consumer cuts open the first body portion 11A in the width direction at a portion near the seal portion 11Sa, and removes the contents 2 from the packaging bag 1A onto a plate or the like through the first body portion 11A. This allows the consumer to eat the cooked contents 2.

[0158] The above-described manufacturing method for a packaging bag can manufacture the packaging bag 1 shown in FIGS. 1 to 3. Packaging bag 1A can also be obtained by filling packaging bag 1 with first contents 2a. Packaging bag 1 is a flat-type packaging bag. Standing-type packaging bags are also known as packaging bag configurations. Standing-type packaging bags are basically manufactured with the assumption that the packaging bag will be placed upright when heated in a microwave oven. Generally, microwave ovens are shorter in height than in width, so the height of a standing-type packaging bag is more limited. In contrast, with a flat-type packaging bag, the packaging bag 1 containing the first contents 2a is placed horizontally in the microwave oven, as shown in FIG. 22(a), so the height restrictions are more relaxed than with a standing-type packaging bag. Therefore, it is easier to ensure a capacity with a flat-type packaging bag 1 than with a standing-type packaging bag, and for example, a larger capacity can be achieved. That is, the above-described manufacturing method for a packaging bag can manufacture a packaging bag 1 that is easy to ensure a capacity. In particular, even when the packaging bag does not have a gusset, as in the packaging bag 1 shown in FIG. 1, it is easy to ensure a sufficient capacity.

[0159] The above-described method for manufacturing a packaging bag can manufacture a packaging bag 1 in which a zipper tape 30 is provided on the flap 12 connected to the bag body 11. In the packaging bag 1, the zipper tape 30 is not provided on the bag body 11 in which the first contents 2a are accommodated, so that even if the first contents 2a are liquid, for example, the first contents 2a are unlikely to leak out of the packaging bag 1.

[0160] With flat-laying packaging bags 1, restrictions on height are relaxed, making it easy to change the size (volume) according to consumer needs. Since the packaging bag 1 is placed flat in the microwave oven, the packaging bag 1 does not tip over during cooking. Therefore, the packaging bag 1 does not need a structure to prevent tipping. Since the contents 2 are cooked while the packaging bag 1 is placed flat in the microwave oven, uneven cooking of the contents 2 is unlikely to occur.

[0161] The packaging bag 1 is sold with a first content 2a (e.g., cooking seasoning liquid) stored inside. A consumer who purchases the packaging bag 1 containing the first content 2a can easily prepare the dish of their choice by adding fresh second content 2b (ingredients, toppings, etc.) just before cooking. As described above, since fresh second content 2b can be added to the packaging bag 1 before cooking in a microwave oven, the flavor and nutritional value of the ingredients, etc., of the second content 2b are less likely to be lost.

[0162] Packaging bag 1 has steam release section 15, which allows steam generated when packaging bag 1 containing contents 2 is heated in a microwave oven to be automatically released to the outside. This prevents packaging bag 1A from bursting during heating in a microwave oven. As described above, packaging bag 1 (packaging bag 1A) has the function of automatically releasing steam generated during heating, so packaging bag 1 also ensures safety, such as preventing burns to fingers when handling packaging bag 1A after cooking.

[0163] One of the advantages of cooking using a microwave oven is that it does not require the use of fire. By using the packaging bag 1, cooking can be done in a microwave oven, and cooking can be done without using fire, as described above. After putting second contents 2b such as ingredients into the packaging bag 1, the contents 2 including second contents 2b can be cooked by heating in a microwave oven. Therefore, by using the packaging bag 1, cooking can be done easily, and the effort and time required to clean up pots, cooking utensils, and tableware can be reduced.

[0164] Before the first contents 2a are supplied to the packaging bag 1, the second tip 11d of the second body 11B is open, and the second tip 11d functions as the supply port 14 for the first contents 2a. In this case, the size of the supply port 14 can be ensured, making it easy to pour the first contents 2a into the packaging bag 1. For example, when the first contents 2a are poured into the packaging bag 1 to obtain the packaging bag 1A, a known (conventionally used) filling machine or the like can be easily applied in the present technology as a device for pouring the first contents 2a.

[0165] The first body 11A of the packaging bag 1 is a part of the bag body 11, and the flap 12 is a part that protrudes outward from the bag body 11. When the contents 2 are cooked in a microwave oven, the contents 2 are placed in the second body 11B. The cooked contents 2 are taken out through the first body 11A. In the bag body 11, the first body 11A and the second body 11B are arranged along the Y direction, so it is easier to take out the contents 2 from the first body 11A than from the flap 12, for example.

[0166] 7 to 11, the method for manufacturing packaging bag 1 involves sealing a pair of side edge portions 50a, 50b of intermediate body 50 in a state in which third portion 503 corresponding to first body portion 11A is folded toward second portion 502 corresponding to second body portion 11B. This forms sealed portions 11Sb, 11Sc, 11Se, and 11Sf as well as sealed portions 12Sb and 12Sc. A folding step is then performed to fold third portion 503 toward first portion 501 corresponding to flap 12.

[0167] If the folding process is performed before forming the seal portions 11Sb, 11Sc, 11Se, 11Sf, 12Sb, and 12Sc, the pair of side edges of the intermediate body 50 is sealed in a state in which the third portion 503 is disposed on the first portion 501 including the zipper tape 30. In this case, a step occurs in the laminated portion of the first portion 501 and the third portion 503 due to the thickness of the zipper tape 30. When sealing the pair of side edges of the intermediate body 50 due to this step, uneven pressure occurs on the side edges of the first portion 501 and the third portion 503, which may prevent the desired sealing. In addition, the step may apply excessive load to the film 10, making the film 10 susceptible to damage.

[0168] In contrast, in the above-described manufacturing method, the folding process is performed after forming the seal portions 11Sb, 11Sc, 11Se, 11Sf, 12Sb, and 12Sc, so there is no effect of the step caused by the thickness of the zipper tape 30. Therefore, the seal portions 11Sb, 11Sc, 11Se, 11Sf, 12Sb, and 12Sc can be properly formed, and damage to the film 10 can be prevented. As a result, for example, in a packaging bag 1 containing a first content 2a, the risk of leakage of the first content 2a can be reduced. The same applies when a second content 2b is contained in the packaging bag 1.

[0169] The method for manufacturing a packaging bag includes a folding step. In the folding step, third portion 503 is folded toward first portion 501. Third portion 503 and first portion 501 correspond to first body portion 11A and flap 12 in packaging bag 1. Therefore, in packaging bag 1 obtained by carrying out the folding step, first body portion 11A and flap 12 overlap each other.

[0170] When filling the packaging bags 1 with the first contents 2a, it is conceivable to continuously convey a plurality of packaging bags 1 toward a filling machine (or a supply device) and sequentially fill the first contents 2a into each of the conveyed packaging bags 1. It is conceivable to arrange the plurality of packaging bags 1 on the conveying line so that they do not overlap each other, but it is advantageous to overlap a portion of adjacent packaging bags 1 in the conveying direction with each other, as this allows more packaging bags 1 to be conveyed while saving space.

[0171] The packaging bag 1 manufactured by the manufacturing method of this embodiment has undergone the folding step, and therefore, as described above, the first body portion 11A and the flap 12 overlap. Therefore, even if multiple packaging bags 1 are arranged on a conveying line to a filling machine (for example, a bag feed magazine) so that adjacent packaging bags 1 partially overlap each other in the conveying direction D, as shown in Fig. 23, the packaging bags 1 can be prevented from getting caught on each other. Fig. 23 schematically shows the packaging bag 1, emphasizing in particular the provision of zipper tape 30. The fact that performing the folding step can prevent multiple packaging bags 1 from getting caught when being conveyed will be specifically described using an example in which a packaging bag obtained without performing the folding step is referred to as packaging bag 1B as a reference example.

[0172] The configuration of packaging bag 1B is the same as that of packaging bag 1 except that third portion 503 is not folded back toward first portion 501. Therefore, among the elements constituting packaging bag 1B, the same elements as those of packaging bag 1 are given the same reference numerals, and redundant explanations will be omitted. Fig. 24 is a schematic diagram for explaining a problem that occurs when the packaging bag of the reference example is conveyed. As in Fig. 23, Fig. 24 also schematically illustrates packaging bag 1B, emphasizing in particular that zipper tape 30 is provided. Fig. 24 shows three packaging bags 1B. The three packaging bags 1B will be referred to as packaging bag 1Ba, packaging bag 1Bb, and packaging bag 1Bc, starting from the front in the conveyance direction.

[0173] In Figure 24, the arrangement of packaging bag 1Ba and packaging bag 1Bb is ideal for conveying multiple packaging bags 1B because there is no snagging between them. However, in the configuration of packaging bag 1B, first body portion 11A and second body portion 11B branch off from one end of flap 12 having zipper tape 30, and the thin first body portion 11A, which does not have zipper tape 30, is positioned above second body portion 11B. Therefore, as with packaging bag 1Bb and packaging bag 1Bc shown in Figure 24, when packaging bag 1Bc is placed on a conveyor line, first body portion 11A may turn up and get caught on packaging bag 1Bb. If such snagging occurs, packaging bag 1Bb and packaging bag 1Bc cannot be properly filled with first contents 2a.

[0174] In contrast, the packaging bag 1 obtained through the folding process is placed on the conveyor line with the flap 12 having the zipper tape 30 arranged on the first body portion 11A. Therefore, the packaging bags are less likely to get caught on each other, as in the packaging bags 1Bb and 1Bc shown in Fig. 24. In particular, since the flap 12 has the zipper tape 30, the weight of the flap 12 is greater than when the zipper tape 30 is not present. Therefore, the state in which the flap 12 is arranged on the first body portion 11A is more likely to be maintained, as shown in the figure.

[0175] As described above, by carrying out the folding process, the packaging bag 1 obtained through the folding process has the flap 12 disposed on the first body portion 11A. FIG. 23 shows an example of the arrangement of the packaging bag 1 when the packaging bag 1 is transported to a filling machine, but even when the packaging bag 1 (packaging bag 1A) filled with the first contents 2a is distributed, it is usually transported with the flap 12 disposed on the first body portion 11A. In the packaging bag 1 manufactured by the above manufacturing method, the zipper tape 30 is attached to the flap 12, not to the bag body 11 in which the first contents 2a are contained, and a watertight seal portion 40 is provided. Therefore, even if the packaging bag 1A is dropped during distribution, the impact on the watertight seal portion 40 can be reduced. This point will be specifically described using FIG. 25.

[0176] If the packaging bag 1 containing the first contents 2a is dropped, the second body 11B containing the first contents 2a will fall first. Therefore, the impact of the drop is transmitted from the second body 11B to the first body 11A. If the flap 12 is disposed on the first body 11A, the impact of the drop is distributed to the first body 11A and the flap 12, as shown by arrows A and B in FIG. 25. Therefore, for example, in a packaging bag without a flap 12, where a zipper tape is attached to the portion corresponding to the first body and a watertight seal is formed, the load generated by the transmitted impact of the drop on the watertight seal formed in the flap 12 is smaller than the load generated on the watertight seal. Therefore, the watertight seal is less likely to be damaged. In particular, when the packaging bag 1 containing the first contents 2a is cooled and transported, the watertight seal portion is more likely to break than when it is not cooled, so it is effective to perform a folding process to ensure that the flap 12 is positioned on the first body portion 11A.

[0177] When the manufacturing method of a packaging bag includes a watertight seal forming step, the folding step is carried out after the watertight seal forming step. In the folding step, the third portion 503 is folded back toward the first portion 501. As a result, in this embodiment, the second flap region 521 of the first portion 501 and the second a bag body region 522 of the third portion 503 face each other. When the watertight seal 40 illustrated in FIG. 5 is formed, as described above, the end region 411 of the watertight film 41 is sealed to the second flap region 521. If this sealing is carried out using, for example, a heat plate formed into a wavy shape, wavy irregularities are formed in the second flap region 521.

[0178] As described above, when the folding step is performed, the second flap region 521 and the 2a bag main body region 522 face each other, and therefore, the unevenness formed in the watertight seal portion 40 is covered by the 2a bag main body region 522. The second flap region 521 and the 2a bag main body region 522 correspond to the first side film portion 121A and the first surface film portion 112A of the packaging bag 1. That is, in the packaging bag 1, the unevenness occurring in the watertight seal portion 40 is covered by the first surface film portion 112A. Therefore, for example, when the packaging bag 1 (packaging bag 1A) as a product is sold with the flap 12 folded down onto the first body portion 11A so that the first surface film portion 112A and the first side film portion 121A face each other, the unevenness of the watertight seal portion 40 is less visible, and therefore the aesthetic appearance of the packaging bag 1 (packaging bag 1A) is improved.

[0179] When manufacturing the intermediate 50 using two films 10, as described in the second example of the intermediate manufacturing process, the intermediate manufacturing process can be carried out to manufacture two intermediates 50 connected together along the first predetermined direction s. This allows the packaging bag 1 to be manufactured efficiently.

[0180] (Variation) Next, modified examples of the packaging bag 1 will be described. Fig. 26 is a plan view of a packaging bag according to a modified example when viewed from the surface. Fig. 27 is a plan view of the packaging bag 4 shown in Fig. 26 when viewed from the bottom. The packaging bag 4 shown in Figs. 26 and 27 differs from the packaging bag 1 shown in Fig. 1 in that a gusset film 17 for forming a gusset is attached to the second body portion 11B and that a supply port 14 is formed in the first body portion 11A. Other than these differences, the configuration of the packaging bag 4 is the same as that of the packaging bag 1. Therefore, the packaging bag 4 will be described focusing on these differences.

[0181] The gusset film 17 is attached to the second body portion 11B so as to close the second tip portion 11d. The gusset film 17 is a film having a heat-sealed surface (second heat-sealed surface). The gusset film 17 may be the same film as the film 10 shown in Figure 6. In this case, the heat-sealed surface of the gusset film 17 is formed by the sealant layer F1 (see Figure 6). The gusset film 17 is inserted into the second body portion 11B in a folded state so that the heat-sealed surface is positioned on the outside. When viewed from the X direction, the gusset film 17 has, for example, a V-shape.

[0182] The gusset film 17 is fixed to the second body portion 11B by being joined to the second tip portion 11d of the second body portion 11B. Specifically, a seal portion 17Sa1 is formed by joining the surface of the folded gusset film 17 facing the second surface film portion 112B to the second tip portion 11d of the second surface film portion 112B, and a seal portion 17Sa2 is formed by joining the surface of the folded gusset film 17 facing the second bottom film portion 111B to the second tip portion 11d of the second bottom film portion 111B. An example of joining the gusset film 17 and the second tip portion 11d is heat sealing.

[0183] As described above, the second tip 11d of the packaging bag 4 is closed by the gusset film 17. Therefore, the first tip 11a of the packaging bag 4 has a supply port 14 formed therein for supplying a portion of the contents toward the second body 11B. That is, the first tip 11a of the packaging bag 4 is open. As a result, an opening that functions as the supply port 14 is formed in the first tip 11a.

[0184] The first tip 11a is sealed after the first contents 2a are supplied into the second body 11B. This closes the supply port 14, and the first contents 2a are hermetically sealed within the packaging bag 4. The packaging bag 4 with the first tip 11a sealed is sometimes referred to as a packaging bag 4A. As shown in FIG. 28, the packaging bag 4A has a seal portion 11Sa formed by sealing the first tip 11a. FIG. 28 is a plan view of the packaging bag 4 (packaging bag 4A) containing the first contents 2a, which are part of the contents to be cooked.

[0185] Next, a method for manufacturing the packaging bag 4 will be described. A first embodiment of the method for manufacturing the packaging bag 4 includes an intermediate manufacturing step for manufacturing the intermediate 50A shown in Fig. 29. Fig. 29 is a diagram for explaining the intermediate manufactured in the intermediate manufacturing step included in the first embodiment of the method for manufacturing the packaging bag 4.

[0186] The intermediate 50A shown in FIG. 29 has a first portion 501, a second portion 502, and a third portion 503.

[0187] The first portion 501 has the same configuration as the intermediate body 50. That is, the first portion 501 is composed of a first flap region 511 on the first surface portion 51 and a second flap region 521 on the second surface portion 52. A first tip portion 501a of the first portion 501 is sealed, and a seal portion 12Sa is formed at the first tip portion 501a. A zipper tape 30 is attached to the first portion 501, and a watertight seal portion 40 is formed therein.

[0188] The configuration of the second portion 502 is the same as that of the intermediate body 50. That is, the second portion 502 is composed of a 1a bag main body region 512 in the first surface portion 51 and a 1b bag main body region 531 in the third surface portion 53. A second tip portion 502a of the second portion 502 is closed by attaching a gusset-forming film 80 including a gusset region 80a.

[0189] The gusset-forming film 80 is a film having the same configuration as the gusset film 17. Therefore, the gusset-forming film 80 has a heat-sealed surface (second heat-sealed surface). The gusset-forming film 80 may be the same film as the film 10. Of the gusset-forming film 80, a gusset region 80a, which is a region corresponding to the gusset film 17, is folded so that the heat-sealed surface faces outward and attached to the second portion 502. The gusset region 80a is attached to the packaging bag 4 at a position where the gusset film 17 will be disposed. The gusset region 80a is sealed to the second tip end portions 502a of the 1a bag main body region and the 1b bag main body region, thereby forming the sealed portion 17Sa1 and the sealed portion 17Sa2.

[0190] The configuration of the third portion 503 is the same as that of the intermediate body 50, except that the third tip portion 503a of the third portion 503 is not closed. That is, the third portion 503 is configured by arranging the 2a bag main body region 522 of the second surface portion 52 and the 2b bag main body region 532 of the third surface portion 53 so as to face each other.

[0191] An example of a method for producing the intermediate 50A (third example of a method for producing an intermediate) will be specifically described.

[0192] [Third example of intermediate manufacturing process] In the third example, a method for producing an intermediate 50A using one film 10 will be described, similar to the first example of the intermediate production process.

[0193] In the third example, as in the first example, the areas of film 10 that are to become first surface portion 51, second surface portion 52, and third surface portion 53 are simply referred to as "first surface portion 51," "second surface portion 52," and "third surface portion 53."

[0194] The folding step is carried out in the same manner as in Example 1. That is, by folding the film 10 in the same manner as in Example 1, the first portion 501, the second portion 502, and the third portion 503 are formed.

[0195] In the third example, the third tip sealing step performed in the first example is not performed, and instead a first tip opening step of opening the first tip 501a and a second tip opening step of opening the second tip 502a are performed. The first tip opening step is the same as in the first example. In the second tip opening step, similar to the supply port forming step in the first example, the second tip 502a may be cut to open the second tip 502a so that the gusset-forming film 80 can be inserted. The order in which the first tip opening step and the second tip opening step are performed is not limited.

[0196] Next, similarly to the first example, a zipper tape attaching step is carried out to attach the zipper tape 30 to the first portion 501.

[0197] Thereafter, the gusset forming step, the watertight seal forming step, and the first tip sealing step are carried out. The order in which the gusset forming step, the watertight seal forming step, and the first tip sealing step are carried out is not limited.

[0198] In the gusset forming step, the gusset region 80a of the gusset forming film 80 is folded so that the heat-sealed surface faces outward and placed inside the second tip 502a opened in the second tip opening step. Thereafter, the gusset region 80a and the second tip 502a are sealed to form the sealed portions 17Sa1 and 17Sa2.

[0199] When the entire gusset-forming film 80 is the gusset region, i.e., when the entire gusset-forming film 80 is used as the gusset film, the gusset-forming film 80 can be folded as described above and inserted into the second portion 502. When only a portion of the gusset-forming film 80 is the gusset region 80a, i.e., when the gusset region 80a is used as the gusset film 17, after sealing the gusset region 80a to the second portion 502, a trimming process can be performed to cut off the portion of the gusset-forming film 80 other than the gusset region 80a from the gusset region 80a. The trimming process can be performed at any time before the packaging bag 4 is completed, as long as it is after the gusset region 80a is joined to the second tip portion 502a.

[0200] The watertight seal forming step and the first tip sealing step are the same as those in the first example.

[0201] The intermediate body 50A is manufactured by carrying out all of the steps up to the gusset forming step, the watertight seal forming step, and the first tip sealing step.

[0202] 29 is produced in the intermediate production process, the intermediate 50A is subjected to the steam release portion forming process, the side edge sealing process, and the folding process described in the method for producing the packaging bag 1. As a result, the packaging bag 4 is obtained.

[0203] In the intermediate 50A, the third tip 503a is open, and therefore the first tip 11a of the first body 11A corresponding to the third tip 503a in the packaging bag 4 functions as the supply port 14. Therefore, a portion of the contents is supplied from the supply port 14 (third tip 503a) of the first body 11A into the second body 11B. Thereafter, the supply port 14 is sealed (supply port sealing step). In a mode in which the intermediate 50A is manufactured in an intermediate manufacturing step, the third tip 503a corresponds to the supply port 14, and therefore the supply port sealing step corresponds to the third tip sealing step. By sealing the supply port 14, the first tip 11a corresponding to the third tip 503a is sealed, and a sealed portion 11Sa is formed. As a result, a packaging bag 4 (packaging bag 4A) is obtained in which a portion of the contents is contained and a sealed portion 11Sa is formed.

[0204] Next, a second embodiment of the method for manufacturing packaging bag 4 will be described. The second embodiment of the method for manufacturing packaging bag 4 has an intermediate manufacturing step for manufacturing intermediate 50B shown in Figure 30. As in the second example of the intermediate manufacturing step, intermediate 50B is an intermediate manufactured using first film 10A and second film 10B. Figure 30 is a drawing for explaining an intermediate manufactured in a fourth example of the intermediate manufacturing step included in the second embodiment of the method for manufacturing packaging bag 4.

[0205] 30 shows a case in which, as in the second example, two intermediate formation regions 70 are set in the first film 10A and the second film 10B along the first predetermined direction s, and intermediates 50B are produced in each intermediate formation region 70. As shown in FIG. 30, the two intermediates 50B have a symmetrical configuration with respect to the imaginary plane P and are connected to each other. When distinguishing between the two intermediate formation regions 70, the two intermediate formation regions 70 will be referred to as a first intermediate formation region 71 and a second intermediate formation region 72, also in the fourth example.

[0206] The configuration of intermediate 50B in each intermediate formation region is the same as that of intermediate 50A, except that intermediate 50B differs from intermediate 50A in that the third tip 503a of third portion 503 is a folded portion of second film 10B and is closed.

[0207] An example of a method for producing the intermediate 50B will be specifically described.

[0208] [Fourth example of intermediate manufacturing process] In the fourth example, similarly to the second example of the intermediate manufacturing process, an intermediate 50B is manufactured using a first film 10A and a second film 10B.

[0209] In the fourth example, as in the second example, the area of ​​the first film 10A that is to become the first surface portion 51 will be simply referred to as the "first surface portion 51," and the areas of the second film 10B that are to become the second surface portion 52 and the third surface portion 53 will be simply referred to as the "second surface portion 52" and the "third surface portion 53."

[0210] As described above, the intermediates 50B manufactured in the first intermediate formation region 71 and the second intermediate formation region 72 have a symmetrical configuration with respect to the virtual plane P. Therefore, the same treatment is applied to the first intermediate formation region 71 and the second intermediate formation region 72, and therefore, the treatment applied to the first intermediate formation region 71 will be mainly described below.

[0211] The film placement step is carried out in the same manner as in the second example. That is, the second film 10B is placed on the first film 10A with a portion of the second film 10B folded to form the third portion 503. As a result, the first portion 501 and the second portion 502 are also formed, as in the second example. In the film placement step, the plate 61 may be placed, with the zipper tape 30 to which the watertight film 41 is attached being placed in the hole portion 61a, as in the second example.

[0212] After the film placement step, the zipper tape attachment step is carried out in the same manner as in the second example.

[0213] After the fastener tape attaching step, the gusset forming step is carried out. In the embodiment using the plate 61, the plate 61 is removed before the gusset forming step. In the gusset forming step, as shown in FIG. 30 , the gusset region 80a of the gusset forming film 80 is folded so that the heat-sealed surface faces outward, and the gusset forming film 80 is inserted between the first film 10A and the second film 10B so that the gusset region 80a is located within the second portion 502.

[0214] As described above, in the fourth example, similarly to the second example, it is assumed that the first intermediate formation region 71 and the second intermediate formation region 72 are set along the first predetermined direction s. Therefore, for example, as shown in Fig. 30, regions near both ends (both ends in the first predetermined direction s) of a single gusset-forming film 80 are folded as gusset regions 80a. The gusset-forming film 80 folded in this manner may be disposed between the first film 10A and the second film 10B so that one of the two folded portions is located in the second portion 502 in the first intermediate formation region 71 and the other is located in the second portion 502 in the second intermediate formation region 72.

[0215] After the gusset-forming film 80 is positioned between the first film 10A and the second film 10B, the gusset region 80a and the second tip portion 502a are sealed to form the sealed portion 17Sa1 and the sealed portion 17Sa2, and the gusset region 80a is fixed to the second portion 502.

[0216] In the gusset forming step, a gusset forming film 80 may be placed in each of the first intermediate forming region 71 and the second intermediate forming region 72. In this case, similar to the third example, the entire gusset forming film 80 may be the gusset region 80a.

[0217] After the gusset forming step is performed, the watertight seal forming step and the first tip sealing step are performed as described in Example 2. The order in which the watertight seal forming step and the first tip sealing step are performed is not limited.

[0218] The watertight seal forming step and the first tip sealing step are performed, whereby the intermediate body 50B is manufactured in the first intermediate body forming region 71.

[0219] The intermediate manufacturing process has been described with a focus on manufacturing the intermediate 50B in the first intermediate-forming region 71, but in each step of the intermediate manufacturing process, the same treatment is also performed on the second intermediate-forming region 72. Therefore, the intermediate 50B is also manufactured in the second intermediate-forming region 72.

[0220] That is, similarly to the second example, in the fourth example of the intermediate manufacturing process, two intermediates 50B that are arranged symmetrically with respect to the imaginary plane P and that are connected to each other are manufactured.

[0221] When the fourth example of the intermediate body manufacturing process is adopted, the two manufactured intermediate bodies 50B are each subjected to the side edge sealing process, the steam release section forming process, the folding process, and the supply port forming process.

[0222] The supply port forming step is a step of opening the third tip portion 503a to form the supply port 14 in the third tip portion 503a. The supply port forming step is performed, for example, after the folding step. In the supply port forming step, the third tip portion 503a is cut to open the third tip portion 503a. The third tip portion 503a may be cut along the second predetermined direction t. Alternatively, for example, the folded portion of the film 10 that constitutes the third tip portion 503a may be cut. When the folded portion of the film 10 that constitutes the third tip portion 503a is cut and removed, the tip of the third portion 503 after cutting is also referred to as the third tip portion 503a. When a trimming process is performed to adjust the shape of the packaging bag 4 after the folding step, the supply port forming step may be performed during the trimming process. By opening the third tip portion 503a, a supply port 14 is formed in the first tip portion 11a (third tip portion 503a) of the first body portion 11A.

[0223] By carrying out the side edge sealing step, steam release portion forming step, folding step, and supply port forming step on each intermediate 50B, a packaging bag 4 is obtained from each intermediate 50B. At this stage, the two packaging bags 4 produced from the two intermediates 50B are also connected. Therefore, when two connected packaging bags 4 are produced as described above, a separation step is carried out to separate the two connected packaging bags 4.

[0224] The supply port forming step is performed on the intermediate 50B, thereby opening the third tip 503a. As a result, the first tip 11a of the first body 11A corresponding to the third tip 503a in the packaging bag 4 functions as the supply port 14. Therefore, a portion of the contents is supplied into the second body 11B through the supply port 14 of the first body 11A. Thereafter, the supply port 14 is sealed (supply port sealing step). By sealing the supply port 14, the first tip 11a (third tip 503a) is sealed, and a sealed portion 11Sa is formed. As a result, a packaging bag 4 (packaging bag 4A) is obtained in which a portion of the contents is contained and a sealed portion 11Sa is formed.

[0225] The packaging bag 4 according to the modified example has the same configuration as the packaging bag 1, except that the gusset film 17 is attached to the second body portion 11B and the first tip portion 11a is configured to function as the supply port 14. The manufacturing method of the packaging bag 4 is the same as the manufacturing method of the packaging bag 1, except that the manufacturing steps related to the above-mentioned differences in configuration are different. Therefore, the packaging bag 4 and the manufacturing method of the packaging bag 4 have the same effects as the packaging bag 1 and the manufacturing method of the packaging bag 1.

[0226] The packaging bag 4 has a gusset film 17, and a gusset is formed on the second tip portion 11d side. Therefore, the capacity of the second body portion 11B can be increased, and as a result, the packaging bag 4 can have a large capacity.

[0227] Although the embodiments and experimental examples of the present invention have been described above, the present invention is not limited to the above embodiments and experimental examples. The present invention is intended to include all modifications within the scope indicated by the claims and within the meaning and scope equivalent to the claims.

[0228] For example, the steam release portion may be formed in a location other than the zipper tape. The method of forming the watertight seal is not limited to the exemplified form. For example, the watertight seal may be formed by joining the ends of the bases of the male component 32 and the female component 33, or by joining watertight films fixed to the ends of the bases of the male component 32 and the female component 33. Alternatively, the watertight seal may be formed by joining parts of the first side film portion and the second side film portion.

[0229] The packaging bag may not have the line marks 16 shown in Figures 1, 2, 26, and 27. For example, the line marks 16 may not be formed due to the pressure during the sealing process, or the packaging bag may be manufactured using a manufacturing method that does not form the line marks 16.

[0230] Although the packaging bag has been described as being sold with the first contents 2a contained therein, it may be provided to consumers without the first contents 2a contained therein. Even in this case, it is possible to put the contents into the packaging bag through the flap 12 and heat and cook them.

[0231] In the second and fourth examples of the intermediate manufacturing process for manufacturing an intermediate using two films 10, two intermediate formation regions 70 are set along the first predetermined direction s. However, when manufacturing an intermediate using two films 10, the number of intermediate formation regions in the first predetermined direction s may be one.

[0232] In the method for manufacturing a packaging bag, a sealed portion does not necessarily have to be formed in a portion that can be closed by folding back a film, etc. In other words, part of the edge of the packaging bag may be formed by folding back a film. [Explanation of symbols]

[0233] 1, 1A...packaging bag, 2...contents, 3...microwave oven, 4, 4A...packaging bag, 10...film, 10A...first film, 10B...second film, 11A...first body portion, 11a...first tip portion, 11B...second body portion, 11d...second tip portion, 11Sa, 11Sb, 11Sc, 11Sd, 11Se, 11Sf, 12Sa, 12Sb, 12Sc, 17Sa1, 17Sa2...seal portion, 12...flap, 13...boundary portion, 14...supply port, 15...steam vent portion, 16...line marks, 30...zipper tape, 32...male member (second zipper member), 33...female member (first zipper member), 40...watertight seal portion, 41...watertight film, 50, 50A, 50B...intermediate body, 51 ...first surface portion, 52...second surface portion, 53...third surface portion, 70...intermediate body forming region, 80...gusset forming film, 80a...gusset region, 111...bottom film portion, 111A...first bottom film portion, 111B...second bottom film portion, 121A...first side film portion, 121B...second side film portion, 411...end region, 501...first portion, 501a...first tip portion, 502...second portion, 502a...second tip portion, 503...third portion, 503a...third tip portion, 511...first flap region, 512...1a bag main body region, 521...second flap region, 522...2a bag main body region, 531...1b bag main body region, 532...2b bag main body region, P...virtual surface.

Claims

1. A method for manufacturing a flat-type packaging bag that contains contents to be heated and cooked in a microwave oven, comprising: An intermediate manufacturing process for manufacturing an intermediate having a first surface portion, and a second surface portion and a third surface portion disposed on the same side of the first surface portion and along a first predetermined direction, the first surface portion has a first flap region and a first a bag body region arranged along the first predetermined direction, the second surface portion has a second flap region that faces the first flap region and that, together with the first flap region, constitutes a first portion of the intermediate body, and a second bag main body region that is bent toward the opposite side of the first surface portion relative to the second flap region, the third surface portion has a first b bag body region that faces the first a bag body region and that, together with the first a bag body region, constitutes a second portion of the intermediate body, and a second b bag body region that is bent in a direction opposite to the first surface portion so as to face the second a bag body region with respect to the first b bag body region and that, together with the second a bag body region, constitutes a third portion of the intermediate body, a first end of the first portion is closed; A zipper tape is attached between the first flap region and the second flap region, Among the first surface portion, the second surface portion, and the third surface portion, the inner surface of the intermediate body is a heat-sealed surface. the intermediate production step; a steam release portion forming step of forming a steam release portion in the intermediate body; a side edge sealing step of forming a seal in each of the first part, the second part, and the third part by sealing both side edges of the first part, the second part, and the third part in a second predetermined direction intersecting the first predetermined direction, while the third part is folded down toward the second part so that the 2b bag main body region is in contact with the 1b bag main body region; a folding step of folding the second portion toward the first portion with respect to the intermediate product that has been subjected to the side edge sealing step and the steam release portion forming step so that the second a bag main body region contacts the first flap region; Equipped with Manufacturing method of packaging bags.

2. In the vapor release portion forming step, the vapor release portion is formed by crushing a part of the zipper tape. A method for manufacturing the packaging bag according to claim 1.

3. The intermediate production process includes: The method further includes a watertight seal forming step of forming a watertight seal on the first portion to separate the zipper tape from the second portion and the third portion until the zipper tape is first opened. A method for manufacturing the packaging bag according to claim 1.

4. The zipper tape is a first zipper member fixed to one of the first flap region and the second flap region; a second zipper member fixed to the other of the first flap region and the second flap region; and The first chuck member and the second chuck member are formed to be engaged with each other, One end of a watertight film for forming the watertight seal portion is fixed to the first zipper member, In the watertight seal portion forming step, an end region including the other end of the watertight film is peelably joined to the other of the first flap region and the second flap region. A method for manufacturing the packaging bag according to claim 3.

5. The intermediate production process includes: a folding step of folding a sheet of film having a first heat-sealed surface so that the first heat-sealed surface faces inward and so as to form the first portion, the second portion, and the third portion, wherein the first tip end of the first portion and the second tip end of the second portion are folded portions of the film, and the first heat-sealed surfaces of the film in regions corresponding to the second a bag main body region and the second b bag main body region, respectively, face each other; a third tip sealing step of sealing a third tip of the third portion; a first tip portion opening step of cutting the first tip portion to open the first tip portion; a supply port forming step of forming a supply port in the second tip portion by opening the second tip portion, for supplying a portion of the contents to the second portion; a zipper tape attaching step of attaching a zipper tape to the first portion where the first tip is opened; a first leading end sealing step of sealing the opened first leading end, which is carried out after the fastener tape attaching step; having A method for manufacturing the packaging bag according to any one of claims 1 to 4.

6. a supply step of supplying a portion of the contents from the supply port to the second portion after the folding step is performed; a supply port sealing step of sealing the supply port after the supply step; Further comprising: A method for manufacturing the packaging bag according to claim 5.

7. The intermediate production process includes: a folding step of folding a sheet of film having a first heat-sealed surface so that the first heat-sealed surface faces inward and so as to form the first portion, the second portion, and the third portion, wherein the first tip end of the first portion and the second tip end of the second portion are folded portions of the film, and the first heat-sealed surfaces of the film in regions corresponding to the second a bag main body region and the second b bag main body region, respectively, face each other; a first tip portion opening step of opening the first tip portion; a zipper tape attaching step of attaching a zipper tape to the first portion where the first tip is opened; a second tip portion opening step of opening the second portion; a gusset forming step of attaching the gusset forming film, which has a second heat-sealed surface and a gusset region for forming a gusset, in a state where the gusset forming film is folded so that the second heat-sealed surface faces outward, to the second portion opened in the second tip opening step so that the gusset region closes the second portion; a first leading end sealing step of sealing the cut first leading end, which is a step performed after the fastener tape attaching step; having A method for manufacturing the packaging bag according to any one of claims 1 to 4.

8. a supplying step of supplying a portion of the contents from a third tip end of the third portion to the second portion after the folding step is performed; a third tip sealing step of sealing the third tip after the supplying step; Further comprising: A method for manufacturing the packaging bag according to claim 7.

9. The intermediate production process includes: a film positioning step of positioning a first film and a second film having first heat-sealed surfaces so that the first heat-sealed surfaces face each other, the second film being positioned opposite the first film in a state in which a part of the intermediate body forming region of the second film is folded away from the first film so as to form the first portion, the second portion, and the third portion in the intermediate body forming region of the first film and the second film; a zipper tape attaching step of attaching a zipper tape to the first portion; a first tip sealing step of sealing the first tip; having A method for manufacturing the packaging bag according to any one of claims 1 to 4.

10. the intermediate manufacturing step includes a third leading end sealing step of sealing a third leading end of the third portion between the film positioning step and the zipper tape attaching step. A method for producing the packaging bag according to claim 9.

11. a supplying step of supplying a portion of the contents to the second portion from a second tip end of the second portion after the folding step is performed; a second tip sealing step of sealing the second tip after the supplying step; Further comprising: A method for producing the packaging bag according to claim 9.

12. two intermediate formation regions are set in the first film and the second film along the first predetermined direction, In the intermediate body manufacturing step, the steam release portion forming step, the side edge sealing step, and the folding step are performed on two intermediate bodies that are located between the two intermediate body formation areas in the first predetermined direction and are symmetrical with respect to an imaginary plane perpendicular to the first predetermined direction, separating the two intermediate bodies that have been subjected to the steam release portion forming step, the side edge sealing step, and the folding step; A method for producing the packaging bag according to claim 9.

13. a supply port forming step of opening a third tip end of the third portion to form a supply port at the third tip end for supplying a portion of the contents to the second portion, The intermediate manufacturing step includes a gusset forming step of attaching a gusset forming film having a second heat-sealed surface and a gusset region for forming a gusset, the gusset forming film being folded so that the second heat-sealed surface faces outward, to the second part so that the gusset region closes the second part. A method for producing the packaging bag according to claim 9.

14. a supply step of supplying a portion of the contents from the supply port to the second portion after the folding step is performed; a supply port sealing step of sealing the supply port after the supply step; Further comprising: The method for manufacturing the packaging bag according to claim 13.

15. two intermediate formation regions are set in the first film and the second film along the first predetermined direction, In the intermediate manufacturing step, the intermediate is manufactured in the two intermediate formation regions, the intermediate being located between the two intermediate formation regions in the first predetermined direction and being symmetrical with respect to a virtual plane perpendicular to the first predetermined direction; performing the steam release portion forming step, the side edge sealing step, and the folding step on the two intermediate bodies; separating the two intermediate bodies that have been subjected to the steam release portion forming step, the side edge sealing step, and the folding step; The method for manufacturing the packaging bag according to claim 13.

16. A flat-type packaging bag for microwave cooking, a bag body for containing contents to be heated and cooked in a microwave oven; a flap having a first side film portion and a second side film portion facing each other and connected to the bag body; Equipped with The bag body is a first body portion having a first surface film and a first bottom film portion that are continuously connected to the first side film at a boundary between the bag body and the flap; a second body portion adjacent to the first body portion along a first direction, the second body portion having a second surface film continuously connected to the second side film portion at a boundary between the bag body and the flap, and a second bottom film portion continuously connected to the first bottom film; and the first bottom film portion and the second bottom film portion are a common bottom film portion, a first tip portion of the first body portion that is located opposite the second body portion in the first direction and that is along a second direction that intersects with the first direction is closed; a pair of first side edges of the first body portion are sealed; a pair of second side edges of the second body portion are sealed; the extending directions of the pair of first side edges and the pair of second side edges intersect with the second direction, a second end portion of the flap that is located opposite the bag body and that is along the second direction is closed; A pair of third side edges of the flap are sealed; When the flap is viewed from the thickness direction of the flap, the extending direction of the pair of third side edges intersects with the second direction, The flap is provided with a zipper tape. packaging bag.

17. In at least the pair of second side edge portions of the second body portion, linear marks are formed along the second direction at positions corresponding to the first tip portion when the first body portion is folded back toward the second body portion with respect to the boundary portion. The packaging bag according to claim 16.

18. The flap is formed with a watertight seal portion for separating the zipper tape from the bag body. The packaging bag according to claim 16 or 17.

Images