Method for manufacturing packaging bag, and packaging bag

Abstract

A method for manufacturing a packaging bag according to one embodiment includes: a step for manufacturing an intermediate having first, second, and third surfaces, the first surface including a first flap region and a first-a bag-body region, the second surface including a second flap region that constitutes a first portion of the intermediate together with the first flap region, and a second-a bag-body region, the third surface including a first-b bag-body region that constitutes a second portion of the intermediate together with the first-a bag-body region, and a second-b bag-body region that constitutes a third portion of the intermediate together with the second-a bag-body region; a step of forming a steam-vent in the intermediate; a step of forming seal portions along both side edges of the first through third portions while the third portion is folded toward the second portion so that the second-b bag-body region contacts the first-b bag-body region; and a folding-back step of folding the second portion toward the first portion so that the second-a bag-body region contacts the first flap region.

Description

Packaging bag manufacturing method and packaging bag

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

[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, and a zipper tape 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 pressure to escape when the internal pressure of the packaging increases during cooking.

[0003] Japanese Patent Application Laid-Open No. 2021-104813

[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, which may cause leakage of the contents from the zipper tape, for example, if the contents are liquid.

[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.

[0006] (1) A manufacturing method of a packaging bag according to one aspect of the present invention is a manufacturing method of a flat-type packaging bag for containing contents to be cooked in a microwave oven, the method comprising: a step of manufacturing an intermediate having a first surface portion, and second and third surface portions disposed on the same side of the first surface portion and disposed along a first predetermined direction; the first surface portion has a first flap region and a bag main body region 1a disposed along the first predetermined direction; the second surface portion has a second flap region facing the first flap region and constituting a first portion of the intermediate body together with the first flap region, and a bag main body region 2a bent relative to the second flap region in a direction opposite to the first surface portion; the third surface portion has a bag main body region 1b facing the bag main body region 1a and constituting a second portion of the intermediate body together with the bag main body region 1a, and a bag main body region 2b bent relative to the bag main body region 1b in a direction opposite to the first surface portion so as to face the bag main body region 2a, and constituting a third portion of the intermediate body together with the bag main body region 2a; the first end of the first portion is closed, a zipper tape is attached between the first flap region and the second flap region, and the inner surfaces of the first, second, and third portions of the intermediate are heat-sealed surfaces; a steam release portion forming step of forming a steam release portion in the intermediate; a side edge sealing step of forming a seal in each of the first portion, the second portion, and the third portion by sealing both side edges in a second predetermined direction intersecting with the first predetermined direction in the first portion, the second portion, and the third portion with the intermediate having been subjected to the side edge sealing step and the steam release portion forming step.

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

[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 process may further include a watertight seal forming process for forming a watertight seal in the first portion so as to separate the zipper tape from the second portion and the third portion 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 process, 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 manufacturing a packaging bag according to any one of (1) to (4) above, the intermediate manufacturing 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 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 body region and the second b bag 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 manufacturing method of the 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 second a bag body region and the second b bag body region, respectively, 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 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 manufacturing method of the 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 described in 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 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 forming 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 manufacturing method of the 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, 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 one of (9) to (11) 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, the steam release section forming process, the side edge sealing process, and the folding process are performed on two intermediates that are located between 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 at the third tip of the third portion by opening the third tip for supplying a portion of the contents to the second portion, 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 portion so that the gusset region closes the second portion.

[0020] (14) The manufacturing method of the 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, 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 portion 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 portion 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 cooking in a microwave oven, comprising: a bag body for containing contents to be cooked in a microwave oven; and a flap having a first side film portion and a second side film portion facing 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, 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 is connected to the first side film at the boundary between the bag body and the flap. a first tip end portion of the flap located opposite the second body portion in a second direction intersecting with the first direction and 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, 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 located opposite the bag body and along the second direction is closed, a pair of third side edges of the flap are sealed, 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, the flap may be formed with a watertight seal portion for separating the zipper tape from the bag body.

[0025] (18) In the packaging bag described in (16) above, a steam release section is formed in the zipper tape, and a watertight seal section is formed in the flap for separating the zipper tape from the bag body, one of the second tip sections of the second body section located opposite the first body section in the first direction and along a second direction intersecting the first direction is closed, and a ratio P1 of the length of the bag body in the second direction to the sum of the length between the boundary section and the first tip section and the length between the center position of the steam release section and the boundary section may be 2 or more.

[0026] In the packaging bag described in (18) above, the flap is provided with a zipper tape and a watertight seal. Therefore, even when contents are placed in the packaging bag, the contents are less likely to leak. In the packaging bag, the ratio P1 is 2 or more, so popping noises can be suppressed when the contents are placed in the packaging bag and heated in a microwave oven.

[0027] (18A) Another example of a packaging bag according to another aspect of the present invention is a flat-type packaging bag for cooking by heating in a microwave oven, comprising: a bag body for containing contents to be cooked by heating in a microwave oven; and a flap having a first side film portion and a second side film portion facing each other and connected to the bag body, wherein the bag body has a first body portion having a first surface film portion and a first bottom film portion that are continuously connected to the first side film portion 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 and having a second surface film portion 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 portion, wherein the first bottom film portion and the second bottom film portion are a common bottom film portion, and a first tip portion and a second end portion of the first body portion that are located opposite the second body portion in the first direction and that are aligned along a second direction that intersects the first direction. one of a second tip end of the second body portion, which is located opposite the first body portion in the first direction and which 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; the extending directions of the pair of first side edges and the pair of second side edges intersect with the second direction; a tip end of the flap, which is located opposite the bag body and which is along the second direction, is closed; a pair of third side edges of the flap are sealed; 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; the flap is provided with a zipper tape having a steam release portion formed thereon and a watertight seal portion for separating the zipper tape from the bag body; and a ratio P1 of the length of the bag body in the second direction to the sum of the length between the boundary portion and the first tip end and the length between the center position of the steam release portion and the boundary portion is 2 or more.

[0028] In the packaging bag described in (18A) above, a zipper tape and a watertight seal are provided on the flap. Therefore, even when contents are placed in the packaging bag, the contents are less likely to leak. In the packaging bag, the ratio P1 is 2 or more, so popping noises can be suppressed when the contents are placed in the packaging bag and heated in a microwave oven.

[0029] (19) In the packaging bag described in (18) or (18A) above, a ratio P2 of the length between the center position of the steam release portion and the boundary portion to the length between the lower end of the watertight seal portion and the boundary portion may be greater than 0 and less than 0.55. In this case, the packaging bag has improved resistance to drops.

[0030] (20) In the packaging bag described in (19) above, the ratio P1 may be greater than 2.3, and the ratio P2 may be greater than 0 and equal to or less than 0.43. In this case, when contents are placed in the packaging bag and heated in a microwave oven, steam can be selectively released through the steam release section, popping noise can be suppressed, and drop resistance can be ensured.

[0031] (21) In the packaging bag described in (19) above, the ratio P2 may be 0.35 or more and 0.43 or less. In this case, when contents are placed in the packaging bag and heated in a microwave oven, steam can be selectively released through the steam release portion, popping noise can be suppressed, and drop resistance can be ensured.

[0032] (22) In the packaging bag described in any of (18) to (21) and (18A) above, the ratio P3 of the length of the bag body in the first direction to the length between the first tip and the boundary may be greater than 2.8 and less than 4.

[0033] (23) In the packaging bag according to any one of (18) to (22) and (18A) above, the first tip may be sealed.

[0034] (24) In the packaging bag described in (23) above, when viewed in a plane with the flap folded toward the first body portion, the steam vent portion may be located closer to the boundary portion than the intended opening portion for opening the first body portion.

[0035] (25) In the packaging bag described in (24) above, when viewed in a plane with the flap folded toward the first body, the steam release section is located closer to the boundary than a first intended opening section for opening the first body and a second intended opening section for opening the flap, and the first intended opening section and the second intended opening section may be in the same position or the second intended opening section may be closer to the boundary than the first intended opening section.

[0036] (26) In the packaging bag of any of (18) to (25) and (18A) above, the watertight seal portion may have a wavy seal that is sealed in a wavy shape.

[0037] (27) In the packaging bag described in any of (16) to (26) and (18A) above, linear marks along the second direction may be formed 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.

[0038] 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.

[0039] FIG. 1 is a plan view of a packaging bag according to a first embodiment, as viewed from the front. FIG. 2 is a plan view of the packaging bag shown in FIG. 1, as viewed from the bottom. FIG. 3 is a perspective view of the packaging bag shown in FIG. 1. FIG. 4 is a plan view of the packaging bag containing a first content, which is a part of the content to be cooked. FIG. 5 is a diagram illustrating a zipper tape and a watertight seal portion. FIG. 6 is a schematic diagram illustrating an example of the configuration of a film forming the packaging bag shown in FIG. 1. FIG. 7 is a diagram illustrating an intermediate produced in an intermediate production step included in the method for producing the packaging bag shown in FIG. 1. FIG. 8 is a plan view of the intermediate shown in FIG. 7. FIG. 9 is a diagram illustrating a steam release portion forming step included in the method for producing the packaging bag shown in FIG. 1. FIG. 10 is a diagram illustrating a side edge sealing step included in the method for producing the packaging bag shown in FIG. 1. FIG. 11 is a diagram illustrating a folding step included in the method for producing the packaging bag shown in FIG. 1. FIG. 12 is a diagram illustrating a folding step included in a first example of an intermediate production step for producing the intermediate shown in FIG. 7. FIG. 13 is a diagram illustrating a third leading end sealing step included in a first example of an intermediate manufacturing process for producing the intermediate shown in FIG. 7 . FIG. 14 is a diagram illustrating a first leading end opening step and a supply port forming step included in a first example of an intermediate manufacturing process for producing the intermediate shown in FIG. 7 . FIG. 15 is a diagram illustrating a zipper tape attaching step included in a first example of an intermediate manufacturing process for producing the intermediate shown in FIG. 7 . FIG. 16 is a diagram illustrating a watertight seal portion forming step included in a first example of an intermediate manufacturing process for producing the intermediate shown in FIG. 7 . FIG. 17 is a diagram illustrating a film disposing step included in a second example of an intermediate manufacturing process for producing the intermediate shown in FIG. 7 . FIG. 18 is a diagram illustrating a film disposing step and a zipper tape attaching step included in a second example of an intermediate manufacturing process for producing the intermediate shown in FIG. 7 . FIG. 19 is a diagram illustrating a watertight seal portion forming step and a first leading end sealing step included in a second example of an intermediate manufacturing process for producing the intermediate shown in FIG. 7 . Fig. 20 is a diagram for explaining a folding step in the case where the intermediate shown in Fig. 7 is manufactured using the second example of the intermediate manufacturing step. Fig. 21 is a diagram showing one step in a method of using a packaging bag.FIG. 22 is a diagram showing a step subsequent to the step shown in FIG. 21 in a method of using a packaging bag. FIG. 23 is a diagram showing a step subsequent to the step shown in FIG. 22 in a method of using a packaging bag. FIG. 24 is a diagram showing a step subsequent to the step shown in FIG. 23 in a method of using a packaging bag. FIG. 25 is a diagram showing a step subsequent to the step shown in FIG. 24 in a method of using a packaging bag. FIG. 26 is a diagram showing a step subsequent to the step shown in FIG. 25 in a method of using a packaging bag. FIG. 27 is a schematic diagram showing an arrangement of multiple packaging bags when transporting multiple packaging bags. FIG. 28 is a schematic diagram showing an arrangement of multiple packaging bags when transporting multiple packaging bags in a reference example. FIG. 29 is a diagram for explaining an example of how a drop impact is transmitted when a packaging bag is dropped. FIG. 30 is a plan view of a packaging bag according to a second embodiment as seen from the front. FIG. 31 is a diagram showing a cut-out view of a flap of the packaging bag shown in FIG. 30. FIG. 32 is a plan view of the packaging bag shown in FIG. 30 when viewed from the bottom. FIG. 33 is a perspective view of the packaging bag shown in FIG. 30. FIG. 34 is a plan view of the packaging bag in a state in which a first content, which is part of the content to be cooked, is contained therein. FIG. 35 is a chart showing the results of Experimental Examples 1 to 10. FIG. 36 is a plan view of a packaging bag according to a modified example when viewed from the front. FIG. 37 is a plan view of the packaging bag shown in FIG. 36 when viewed from the bottom. FIG. 38 is a plan view of the packaging bag shown in FIG. 36 when a first content, which is part of the content to be cooked, is contained therein. FIG. 39 is a drawing for explaining an intermediate produced in a third example of an intermediate production step included in the manufacturing method of the packaging bag shown in FIG. 36. FIG. 40 is a drawing for explaining an intermediate produced in a fourth example of an intermediate production step included in the manufacturing method of the packaging bag shown in FIG. 36.

[0040] 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.

[0041] (First embodiment) Fig. 1 is a front view of a packaging bag 1 according to a first 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.

[0042] The packaging bag 1 is a flat-laying (or horizontal-laying) packaging bag for cooking contents 2 (see FIGS. 4, 23, and 24) contained in the packaging bag 1 in a microwave oven. When the packaging bag 1 of the first embodiment is sold in a store, it contains first contents 2a (see FIG. 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 FIG. 4).

[0043] A consumer who purchases the packaging bag 1A places second contents 2b (see FIGS. 23 and 24 ) that constitute the contents to be cooked together with the first contents 2a into the packaging bag 1A, and then heats and 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.

[0044] The packaging bag 1 shown in Figures 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 Figure 6. Figure 6 is a diagram for explaining an example of the film 10 that forms the packaging bag 1.

[0045] [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.

[0046] 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).

[0047] 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 resin copolymer. Examples of the polypropylene-based resin include homopolypropylene resin (PP), propylene-ethylene random copolymer, propylene-ethylene block copolymer, and propylene-α-olefin copolymer.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] When the film 10 includes the gas barrier film, the plastic film included in the gas barrier film may be a film formed from a polymer resin composition. Examples of materials for the plastic film included in 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 like, which are appropriately selected depending on the application. Polypropylene, polyethylene terephthalate, etc., are more preferable as the material for the plastic film included in the gas barrier film from the viewpoints of film strength and cost.

[0052] 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 layer on a plastic film of the gas barrier film, and then providing a vapor-deposited layer and a wet-coating layer in that order.

[0053] 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.

[0054] The vapor deposition layer may be formed by depositing a SiO ２ , Al ２ O ３ The thickness of the deposited layer may be 15 nm or more and 30 nm or less.

[0055] An inorganic processed product layer (hereinafter referred to as a "second inorganic compound layer") may be further formed by a wet coating method 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.

[0056] 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.

[0057] 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.

[0058] As the gas barrier layer, for example, SiO ２ When a printed layer is used, 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.

[0059] 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.

[0060] 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.

[0061] Examples of the printing method include gravure printing, offset printing, gravure offset printing, flexographic printing, silk screen printing, and inkjet printing.

[0062] The layers of film 10 may be joined by methods known in the art, such as adhesives, plastic layers for extruded lamination, etc.

[0063] 1 to 4, an example of the configuration of a packaging bag 1 using film 10 will be described. [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).

[0064] <Bag body> The bag body 11 is a flat, cylindrical body that is closed on three sides when viewed from the surface (or bottom). An example of the length L1 (mm) of the bag body 11 in the first direction is 180 mm or more and 230 mm or less. An example of the length L2 (mm) of the bag body 11 in the second direction is 150 mm or more and 200 mm or less. The bag body 11 has a first body portion 11A and a second body portion 11B along the 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.

[0065] The first body portion 11A has a first bottom film portion 111A (see FIG. 2) and a first surface film portion 112A. The first bottom film portion 111A and the first surface film portion 112A are portions of the film 10 that constitute the first body portion 11A.

[0066] The first body 11A has a first tip 11a, a side edge 11b, and a side edge 11c. The first tip 11a is an end of the first body 11A located opposite the second body 11B in the first direction and extends in a second direction intersecting the first direction. The side edge 11b and the side edge 11c are a pair of side edges (a pair of first side edges) of the first body 11A when the first body 11A is viewed in a plan view and extend along the first direction.

[0067] 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 11A refers to a view of the first body 11A from the front side or first front film portion 112A side, or from the bottom side (rear side) or first bottom film portion 111A side. A plan view of the first body 11A corresponds to a view of the first body 11A from the thickness direction.

[0068] The first body portion 11A has a sealed portion 11Sa formed by sealing the first tip portion 11a, and sealed portions 11Sb and 11Sc formed by sealing the side edge portions 11b and 11c. Sealed portions 11Sa, 11Sb, and 11Sc are formed by heat-sealing the first bottom film portion 111A and the first surface film portion 112A. Sealed portions 11Sb and 11Sc extend from both ends of sealed portion 11Sa toward the second body portion 11B.

[0069] 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. To remove the contents 2, a consumer cuts (or tears) the portion of the first body portion 11A near the seal portion 11Sa to open the first body portion 11A. To open the first body portion 11A, an opening trigger portion 211 may be formed in at least one of the side edge portions 11b and 11c near the seal portion 11Sa. In the packaging bag 1 described in the first embodiment, the opening trigger portion 211 is formed in each of the side edge portions 11b and 11c. The opening trigger portion 211 is a portion that serves as the starting point for opening, and is, for example, a notch.

[0070] The first body portion 11A may have an opening guide line extending continuously in the X direction from the opening trigger portion 211. 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.

[0071] An example of the opening guide line is an easy-open mechanism (or a fragile portion) that allows the first body portion 11A to be torn with a finger. The easy-open mechanism may be a mechanism known in the art. For example, the easy-open mechanism may be realized by half-cutting at least one of the first bottom film portion 111A and the first surface film portion 112A, or by utilizing the molecular orientation of the film 10.

[0072] The second body portion 11B has a second bottom film portion 111B (see FIG. 2) and a second surface film portion 112B. The second bottom film portion 111B and the second surface film portion 112B are 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.

[0073] The second body 11B has a second tip 11d, a side edge 11e, and a side edge 11f. The second tip 11d is an end of the second body 11B located opposite the first body 11A in the first direction and extends in the X direction (second direction). The side edge 11e and the side edge 11f are a pair of side edges (a pair of second side edges) of the second body 11B when the second body 11B is viewed from above and extend along the Y direction (first direction).

[0074] The plan view of the second body portion 11B refers to the view of the second body portion 11B from the front side or the second front film portion 112B side, or from the bottom side (rear side) or the second bottom film portion 111B side. The plan view of the second body portion 11B corresponds to the view of the second body portion 11B from the thickness direction.

[0075] The second body 11B has a sealed portion 11Se and a sealed portion 11Sf formed by sealing the side edge portions 11e and 11f. The sealed portion 11Se and the sealed portion 11Sf are formed by heat-sealing the second bottom film portion 111B and the second surface film portion 112B. The sealed portion 11Se and the sealed portion 11Sf extend from both ends of the second tip portion 11d toward the first body 11A.

[0076] 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 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 length L5 (mm) from linear mark 16 to boundary portion 13 is substantially the same as length L1a (mm) from boundary portion 13 to first tip 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.

[0077] 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 second body 11B with the first contents 2a, and the internal space of the second body 11B functions as a space for accommodating the first contents 2a. Supplying the first contents 2a from the supply port 14 to the second body 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 11B. Therefore, the packaging bag 1A has a seal portion 11Sd formed by sealing the second tip 11d, as shown in Figure 4.

[0078] In the bag body 11, the second body 11B is a portion that accommodates the contents 2 (first contents 2a and second contents 2b) during cooking, and the first body 11A is a portion from which the contents 2 are removed after cooking. From the viewpoint of ensuring space in the second body 11B for accommodating the contents 2, the length L1b (mm) from the boundary 13 to the second tip 11d may be longer than the length L1a from the boundary 13 to the first tip 11a.

[0079] <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.

[0080] The flap 12 has a tip 12a, a side edge 12b, and a side edge 12c. The tip 12a is the end of the flap 12 opposite the bag body 11 and extends in the X direction. The side edge 12b and the side edge 12c extend in a direction intersecting the X direction when the flap 12 is viewed in a plan view. In the first embodiment, the side edge 12b and the side edge 12c are each perpendicular to the extension direction of the tip 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 12b and the side edge 12c are a pair of side edges (a pair of third side edges) of the flap 12.

[0081] 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.

[0082] 1, the length L6 (mm) from the boundary 13 to the tip 12a may be shorter than the length L1a from the boundary 13 to the first tip 11a. In other words, the flap 12 may be smaller in size when viewed in plan than the first body 11A.

[0083] The flap 12 has a zipper tape 30 provided between the tip 12a (or the seal portion 12Sa) and the boundary portion 13. The flap 12 may have an opening trigger portion 221 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 the first embodiment, a case will be described in which the opening trigger portion 221 is formed at each of the side edge portions 12b and 12c, and the watertight seal portion 40 is provided on the flap 12.

[0084] The opening trigger 221 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 11B from the flap 12. The opening trigger 221 is, for example, a notch.

[0085] The length between the opening trigger portion 221 and the boundary portion 13 may be the same as the length between the opening trigger portion 211 and the boundary portion 13. In this configuration, when the flap 12 is folded toward the first body portion 11A, the opening trigger portion 221 overlaps the opening trigger portion 211. Therefore, for example, when manufacturing the packaging bag 1, the opening trigger portion 211 and the opening trigger portion 221 can be formed together.

[0086] When the size of the flap 12 is smaller than the size of the first body portion 11A (when the length L6 is shorter than the length L1a), the opening trigger portions 211, 221 may be formed so that, in a plan view with the flap 12 folded toward the first body portion 11A, the opening trigger portions 211, 221 are positioned differently relative to the boundary portion 13. The flap 12 and the first body portion 11A have different functions and therefore different opening timings. When the opening trigger portions 211 and 221 are positioned differently relative to the boundary portion 13, the opening trigger portions 211 and 221 are easily visible, making it less likely that the opening timing of the first body portion 11A and the flap 12 will be incorrect, and it is easier to open the flap 12 and the first body portion 11A in the order recommended by the manufacturer of the packaging bag 1. In particular, it is effective that the opening trigger portion 211 is formed so that, when viewed in a plane with the flap 12 folded toward the first body portion 11A, the length between the opening trigger portion 211 and the boundary portion 13 is longer than the length L6.

[0087] The flap 12 may have an opening guide line extending continuously in the X direction from the opening trigger portion 221. 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.

[0088] 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. For example, the easy-open mechanism may be realized by half-cutting at least one of the first side film portion 121A and the second side film portion 121B, or may be realized by utilizing the molecular orientation of the film 10.

[0089] 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.

[0090] In the packaging bag 1 described in the first embodiment, a portion 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 the first embodiment is a weak bite portion with reduced zipper function (interlocking function) so that the portion of the interlocking portion 31 corresponding to the steam release portion 15 is more easily unzipped than the other portions. The weak bite portion, which is the steam release portion 15, only needs to be configured so that when only the weak bite portion is cut out from the zipper tape 30, the two components constituting the weak bite portion (the male member 32 and the female member 33 shown in FIG. 5) can be separated without getting caught. The weak bite portion can be formed by crushing a portion of the interlocking portion 31. The bite portion 31 may be crushed, for example, by heating, pressing, etc. The steam release portion 15 may be disposed in the center of the zipper tape 30 in the width direction (X direction).

[0091] The watertight seal portion 40 is a portion that separates the zipper tape 30 from the internal space of the bag body 11. In the first 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.

[0092] 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.

[0093] 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.

[0094] As shown in Figure 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 Figure 5, a configuration 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 will be described. However, the male member 32 may be fixed to the inner surface of the second side film portion 121B and the female member 33 may be fixed to the inner surface of the first side film portion 121A.

[0095] 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.

[0096] The base 321 may be fixed to the first side film part 121A by joining (e.g., heat sealing) the entire surface of the base 321 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 joining (e.g., heat sealing) both ends 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 regions 321a and 321b indicated by dashed lines in Fig. 5 .

[0097] The insertion portion 322 extends in the X direction, similar to the base 321. The insertion portion 322 is provided along the base 321. 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, similar to 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 the direction opposite to the first side film portion 121A.

[0098] 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.

[0099] The base 331 may be fixed to the second side film part 121B by joining (e.g., heat sealing) the entire surface of the base 331 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 (e.g., heat sealing) both ends 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 regions 331a and 331b indicated by dashed lines in Fig. 5 .

[0100] 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.

[0101] The head 322a and the receiving portion 332 (or the recess 332a) may be configured to be able to mate with each other. The head 322a and the receiving portion 332 (or the recess 332a) form the occlusion portion 31.

[0102] The bite strength (internal bite strength) of the inside of the bite portion 31 (the bag body 11 side) and the bite strength (external bite strength) of the outside of the bite portion 31 (the tip portion 12a side) may satisfy the relationship shown in the following formula (1): internal bite strength > external bite strength (A).

[0103] An engaging portion 31 that satisfies formula (A) 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.

[0104] When a consumer opens the zipper tape 30 after the seal portion 12Sa side of the flap 12 is torn, the consumer grasps the ends of the first side film portion 121A and the second side film portion 121B near the tip portion 12a and spreads the flap 12. Therefore, as shown in formula (A), 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 (A), 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, when the occlusion portion 31 satisfies formula (A), the zipper tape 30 can be easily opened when the second content 2b is inserted through the flap 12, while preventing the zipper tape 30 from unexpectedly opening during cooking.

[0105] As shown in Figure 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. An end region 411 of the watertight film 41, including the end opposite the end fixed to the female member 33, is releasably 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, for example, in a wavy shape. In Figure 5, the area surrounded by a dashed line is schematically shown as the area where the wavy seal 42 is formed.

[0106] 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 length from the boundary portion 13 to the zipper tape 30 may be half or less of the length L6. 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.

[0107] [Manufacturing Method of Packaging Bag] Next, one embodiment of a manufacturing method of the packaging bag 1 will be described with reference to Figures 7 to 11. Below, a method of 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.

[0108] The manufacturing method of the packaging bag 1 includes an intermediate manufacturing step, a steam release portion forming step, a side edge sealing step, and a folding step.

[0109] [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 for explaining 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 indicated by solid lines. The hatching in FIG. 8 indicates 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.

[0110] 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).

[0111] 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.

[0112] The first portion 501 corresponds to the flap 12. The first flap region 511 corresponds to the second side surface film portion 121B. The second flap region 521 corresponds to the first side surface film portion 121A.

[0113] 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 seal portion 12Sa is formed by sealing the first tip 501a.

[0114] The first a bag body region 512 and the first b bag body region 531 face each other. The first a bag body region 512 and the first b bag body region 531 constitute the second portion 502 of the intermediate body 50.

[0115] The second portion 502 corresponds to the second body portion 11B. The 1a bag main body region 512 corresponds to the second top film portion 112B. The 1b bag main body region 531 corresponds to the second bottom film portion 111B.

[0116] The second tip 502a of the second portion 502 is open. The second tip 502a is the end of the second portion 502 that is located opposite the first portion 501. The second tip 502a corresponds to the second tip 11d of the second body portion 11B. The open second tip 502a is the supply port 14 of the packaging bag 1.

[0117] 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.

[0118] The third portion 503 corresponds to the first body portion 11A. The second a bag main body region 522 corresponds to the first top film portion 112A. The second b bag main body region 532 corresponds to the first bottom film portion 111A.

[0119] A third tip 503a of the third portion 503 is sealed. The third tip 503a is an end of the third portion 503 located opposite a connection portion 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.

[0120] 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.

[0121] In the first 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 wave-shaped seal 42 is formed between the watertight film 41 and the second flap region 521.

[0122] [Vapor Release Portion Forming Step] In the vapor release portion forming step, as shown in Fig. 9, the vapor release portion 15 is formed in the intermediate body 50. Fig. 9 is a plan view of the intermediate body 50 on which the vapor release portion 15 has been formed. In the first embodiment, the vapor release portion 15 is formed as a weak bite portion by crushing a part of the bite portion 31 of the zipper tape 30 by applying pressure, heat deformation, or the like.

[0123] [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 are sealed while 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 the first embodiment, the pair of side edges 50a, 50b of the intermediate body 50 is heat-sealed while 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.

[0124] 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 folded toward the second part 502, heat sealing (sealing process) 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.

[0125] 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.

[0126] [Folding Process (Inverting Process)] In the folding process, as shown in Fig. 11 , the third portion 503 of the intermediate product 50 that has undergone the side edge sealing process 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 process.

[0127] When the packaging bag 1 has the opening trigger portion 211 and the opening trigger portion 221, a step of forming the opening trigger portion 211 and the opening trigger portion 221 is carried out. For example, the step of forming the opening trigger portion 211 may be carried out between the side edge sealing step and the folding-back step, and the step of forming the opening trigger portion 221 may be carried out after the folding-back step. When the opening trigger portion 211 and the opening trigger portion 221 are formed equidistant from the connection portion 503b (boundary portion 13), the opening trigger portions 211 and 221 may be formed simultaneously with the first portion 501 and the third portion 503 overlapped after the folding-back step.

[0128] 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.

[0129] The timing for forming the opening trigger portions 211, 221 and the opening guide line is the same in various examples of manufacturing methods for packaging bags (or intermediate products) described later.

[0130] During 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 through the supply port 14 (supply process). 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 process). The packaging bag 1A manufactured as described above is sold as a product in stores, etc.

[0131] The intermediate manufacturing step included in the manufacturing method of the packaging bag 1 will now be described in detail.

[0132] [First Example of Intermediate Manufacturing Method] First, a case where an intermediate 50 is manufactured using one film 10 will be described. In the first example of the intermediate manufacturing process, the intermediate 50 is manufactured by folding an intermediate formation region of one film 10, which 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.

[0133] First, as shown in Fig. 12, the film 10 is folded to form a first portion 501, a second portion 502, and a third portion 503 (folding step). Fig. 12 is a diagram for explaining the folding step.

[0134] By folding the film 10, the first surface 51, the second surface 52, and the third surface 53 are formed in regions 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 regions 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-mentioned folding process will be explained.

[0135] (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.

[0136] (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.

[0137] (c) The second surface portion 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 portion 52 faces the inner surface of the 2b bag body region 532 in the third surface portion 53, and the third surface portion 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 opposite each other in a palm-to-palm manner, forming the third portion 503. At this stage, the third tip portion 503a of the third portion 503 is not closed.

[0138] The order of folding the film 10 described above in (a), (b), and (c) is not limited.

[0139] In the folding process, the portions of the first bag body region 531 and the second bag body region 532, which are arranged facing each other in a palm-to-palm manner, that are closer to 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.

[0140] In the first 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.

[0141] 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.

[0142] After forming the seal portion 11Sa, as shown in FIG. 14 , the first tip 501a is opened (first tip opening process), and the second tip 502a is also opened to form the supply port 14 in the second tip 502a (supply port forming process). In the first tip opening process, the first tip 501a may be cut along the second predetermined direction t to open the first tip 501a. In the supply port forming process, 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 process and the supply port forming process is not limited. FIG. 14 is a diagram for explaining the first tip opening process and the supply port forming process.

[0143] After the first tip opening step, the zipper tape 30 with the watertight film 41 fixed thereto is attached to the inside of the opened first portion 501 as shown in Fig. 15 (zipper tape attaching step). Fig. 15 is a diagram for explaining the zipper tape attaching step.

[0144] 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-described method of fixing the zipper tape 30 to the first side film portion 121A and the second side film portion 121B (explanation 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.

[0145] After the fastener tape attaching step, as shown in Fig. 16, the watertight film 41 is bonded to the inner surface of the first part 501 to form the watertight seal 40 (watertight seal forming step). Fig. 16 is a diagram for explaining the watertight seal forming step.

[0146] The watertight seal 40 is formed in the same manner as in the method for forming the watertight seal 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.

[0147] 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.

[0148] 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.

[0149] [Second Example of Intermediate Manufacturing Process] Next, a description will be given of a process 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 .

[0150] First, as shown in Fig. 17, the first film 10A and the second film 10B are arranged to face each other (film arrangement step). Fig. 17 is a diagram for explaining the film arrangement step.

[0151] 17 , a description will be given of a configuration 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.

[0152] 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."

[0153] 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 that is perpendicular to the first predetermined direction s. The same processing is performed on the first intermediate formation region 71 and the second intermediate formation region 72. Therefore, unless otherwise specified, the processing on the first intermediate formation region 71 will be described below.

[0154] 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. This forms a third portion 503 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 second a bag main body region 522 of the second surface portion 52 and the second b 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.

[0155] As described above, when second film 10B is placed on first film 10A in a folded state, in first intermediate formation region 71, a first portion 501 is formed by first flap region 511 of first surface portion 51 and second flap region 521 of second surface portion 52, and a second portion 502 is formed by bag body region 1a 512 of first surface portion 51 and bag body region 1b 531 of third surface portion 53. At this stage, first tip 501a of first portion 501 and second tip 502a of second portion 502 are open.

[0156] When performing the film positioning step, 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.

[0157] 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.

[0158] In the third leading end sealing step, the third leading end 503a is heat-sealed, for example. By performing the third leading end 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, facilitating sealing of the third leading end 503a and attachment of the zipper tape 30 to the first portion 501.

[0159] 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 501 a 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 the 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 501 a is, for example, heat-sealed. By performing the first leading edge sealing step, the seal portion 12Sa is formed.

[0160] By carrying out the watertight seal portion forming step and the first tip sealing step, the intermediate body 50 is manufactured in the first intermediate body forming region 71 .

[0161] The intermediate manufacturing process has been described with a focus on manufacturing the intermediate 50 in the first intermediate formation region 71, but in each step of the intermediate manufacturing process, the same 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 are connected to each other are manufactured.

[0162] 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.

[0163] 20 , a folding process is performed in which the third portion 503 is folded back toward the first portion 501 in each of the intermediates 50 in the first intermediate formation region 71 and the second intermediate formation region 72. 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 performed 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.

[0164] In each packaging bag 1 obtained by carrying out the separation step, the second tip 11d of the second body 11B corresponding to the second tip 502a of the second portion 502 is open. Therefore, the second tip 11d (second tip 502a) functions as the supply port 14. Therefore, the supply port sealing step corresponds to the second tip sealing step of sealing the second tip 502a of the intermediate body 50.

[0165] 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.

[0166] [Method of Using the Packaging Bag] Next, using Figures 21, 22, 23, 24, 25, and 26, we will explain how a consumer who has purchased the packaging bag 1 (packaging bag 1A) containing the first content 2a uses the packaging bag 1A. Figures 21, 22, 23, 24, 25, and 26 show each step of the method of using the packaging bag 1A. Figures 21 to 24, 25, and 26 show simplified schematic views of the packaging bag 1. In the packaging bag 1, the area of ​​the zipper tape 30 is shown as a black area.

[0167] As shown in FIG. 21 , a consumer opens the flap 12 by tearing the tip 12a of the flap 12 in the width direction. The consumer may tear the flap 12 with their fingers or may open the flap 12 using a bladed tool such as scissors or a knife. After opening the flap 12, the consumer opens the zipper tape 30 as shown in FIG. 22 . 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 away from the first side film portion 121A. In this state, as shown in FIG. 23 , the consumer places the second contents 2b into the second body portion 11B through the flap 12. Then, as shown in FIG. 24 , the consumer closes the zipper tape 30 to seal the contents 2 (first contents 2a and second contents 2b).

[0168] 25 , 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 (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 in packaging bag 1A during cooking of contents 2 in microwave oven 3, steam release portion 15 opens and steam is released from steam release portion 15 to the outside of packaging bag 1A.

[0169] 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 Fig. 26, the consumer cuts open the first body portion 11A in the width direction near the sealed 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.

[0170] The above-described manufacturing method for a packaging bag can produce 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-laying type. Standing-up packaging bags are also known as packaging bag configurations. Standing-up packaging bags are generally manufactured with the assumption that the packaging bag will be placed upright during microwave heating. Because microwave ovens are generally shorter in height than in width, the height of a standing-up packaging bag is more limited. In contrast, with a flat-laying type, the packaging bag 1 containing the first contents 2a is placed horizontally in the microwave oven, as illustrated in FIG. 25 , so the height restriction is more relaxed than with a standing-up packaging bag. Therefore, the flat-laying type packaging bag 1 can more easily secure a capacity than a standing-up type packaging bag, and, for example, a larger capacity can be achieved. That is, the above-described manufacturing method for a packaging bag can produce a packaging bag 1 that is easy to secure 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.

[0171] 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.

[0172] In the flat-laying type packaging bag 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 in a flat state 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 over. 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 less likely to occur.

[0173] The packaging bag 1 is sold with a first content 2a (e.g., a cooking seasoning liquid) stored therein. A consumer who purchases the packaging bag 1 containing the first content 2a can easily prepare the consumer's desired dish by adding fresh second content 2b (foodstuffs, 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 foodstuffs, etc., as the second content 2b, are less likely to be lost.

[0174] Since the packaging bag 1 has the steam vent portion 15, steam generated when the packaging bag 1 containing the contents 2 is heated in a microwave oven can be automatically released to the outside. This prevents the packaging bag 1A from bursting during heating in a microwave oven. As described above, since the packaging bag 1 (packaging bag 1A) has the function of automatically releasing steam generated during heating, the packaging bag 1 also ensures safety, for example, by preventing burns to fingers when handling the packaging bag 1A after cooking.

[0175] One of the advantages of cooking using a microwave oven is that it does not require fire. By using the packaging bag 1, cooking can be performed using a microwave oven, and cooking can be performed without using fire, as described above. After placing second contents 2b such as ingredients into the packaging bag 1, the contents 2 including the second contents 2b can be cooked by heating in a microwave oven. Therefore, using the packaging bag 1 makes cooking easy and reduces the effort and time required to clean up pots, cooking utensils, and tableware after cooking.

[0176] 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.

[0177] 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 removed 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 remove the contents 2 from the first body 11A than from the flap 12, for example.

[0178] 7 to 11, the method for manufacturing the packaging bag 1 involves sealing a pair of side edge portions 50a, 50b of the intermediate body 50 while the third portion 503 corresponding to the first body portion 11A is folded toward the second portion 502 corresponding to the second body portion 11B. This forms the sealed portions 11Sb, 11Sc, 11Se, and 11Sf as well as the sealed portions 12Sb and 12Sc. A folding step is then performed to fold the third portion 503 toward the first portion 501 corresponding to the flap 12.

[0179] 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 with the third portion 503 disposed on the first portion 501 including the zipper tape 30. In this case, a step is generated 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 is generated 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.

[0180] 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.

[0181] The method for manufacturing the packaging bag includes a folding step, in which the third portion 503 is folded back toward the first portion 501. The third portion 503 and the first portion 501 correspond to the first body portion 11A and the flap 12 in the packaging bag 1. Therefore, in the packaging bag 1 obtained by carrying out the folding step, the first body portion 11A and the flap 12 overlap each other.

[0182] 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, since this allows more packaging bags 1 to be conveyed while saving space.

[0183] The packaging bag 1 manufactured by the manufacturing method of the first 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 (e.g., a bag feed magazine) to a filling machine so that adjacent packaging bags 1 partially overlap each other in the conveying direction D, as shown in Fig. 27, the packaging bags 1 can be prevented from getting caught on each other. Fig. 27 schematically illustrates the packaging bag 1, emphasizing in particular the provision of the zipper tape 30. The fact that the folding step can be performed to prevent multiple packaging bags 1 from getting caught when being conveyed will be specifically described below using, as a reference example, a packaging bag obtained without the folding step, referred to as packaging bag 1B.

[0184] 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 designated by the same reference numerals, and redundant description will be omitted. Figure 28 is a schematic diagram for explaining a problem that occurs during conveyance of the packaging bag of the reference example. As in Figure 27, Figure 28 also schematically illustrates packaging bag 1B, emphasizing in particular the provision of zipper tape 30. Figure 28 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, in order from the front in the conveyance direction.

[0185] In Figure 28, 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 in packaging bag 1Bb and packaging bag 1Bc shown in Figure 28, 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.

[0186] 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 disposed 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 Figure 28. 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 disposed on the first body portion 11A is more likely to be maintained, as shown in the figure.

[0187] As described above, by performing the folding process, the packaging bag 1 obtained through the folding process has the flap 12 positioned on the first body portion 11A. While FIG. 27 shows an example of the placement of the packaging bag 1 when transporting the packaging bag 1 to a filling machine, the packaging bag 1 (packaging bag 1A) filled with the first contents 2a is typically transported with the flap 12 positioned on the first body portion 11A when distributed. 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 containing the first contents 2a, 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. 29 .

[0188] If the packaging bag 1 containing the first contents 2a is dropped, the second body 11B containing the first contents 2a falls 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. 29 . 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 be damaged 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.

[0189] 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 the first 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 performed using, for example, a heat plate formed into a wavy shape, wavy irregularities are formed in the second flap region 521.

[0190] As described above, when the folding step is performed, the second flap region 521 and the second a bag main body region 522 face each other, so that the unevenness formed in the watertight seal portion 40 is covered by the second a bag main body region 522. The second flap region 521 and the second a 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 the aesthetic appearance of the packaging bag 1 (packaging bag 1A) is improved.

[0191] 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 performed to manufacture two intermediates 50 connected together along the first predetermined direction s. This allows the packaging bag 1 to be manufactured efficiently.

[0192] When packaging bag 1 (packaging bag 1A) containing contents 2 is heated in a microwave oven, second body portion 11B expands. When a certain pressure is reached inside packaging bag 1A, steam is released through steam release portion 15, reducing the pressure inside packaging bag 1A. At this time, in a configuration in which line marks 16 are formed on packaging bag 1 (packaging bag 1A), the presence of line marks 16 generates a certain tension in second body portion 11B of packaging bag 1A. This tension prevents the maximum expansion portion of second body portion 11B from sinking lower than the position of steam release portion 15 when steam is released through steam release portion 15 of packaging bag 1A during microwave heating. As a result, the risk of contents 2 spraying out from steam release portion 15 during microwave heating can be reduced.

[0193] Second Embodiment Fig. 30 is a front view of a packaging bag 5 according to a second embodiment. Fig. 31 is a cutaway view of the flap 12 of the packaging bag 5 shown in Fig. 30. Fig. 32 is a rear view of the packaging bag 5 shown in Fig. 30. Fig. 33 is a perspective view of the packaging bag 5. Figs. 30 to 32 are views showing a state in which the flap 12 of the packaging bag 5 is folded down toward the first body portion 11A of the bag main body 11 of the packaging bag 5. Fig. 33 is a view showing a state in which the flap 12 is raised relative to the bag main body 11 of the packaging bag 5. Fig. 34 is a plan view of the packaging bag 5 containing first contents 2a, which are part of the contents to be cooked.

[0194] Similar to the packaging bag 1, the packaging bag 5 is a flat (or horizontal) type packaging bag for cooking contents 2 (see FIG. 34) contained in the packaging bag 5 in a microwave oven. When the packaging bag 5 is sold in stores, it contains first contents 2a (see FIG. 34), which are part of the contents 2 to be cooked. Similar to the first embodiment, an example of the first contents 2a is a cooking seasoning liquid. Hereinafter, the packaging bag 5 containing the first contents 2a may also be referred to as packaging bag 5A (see FIG. 34).

[0195] A consumer who purchases the packaging bag 5A places the second contents 2b (see FIGS. 23 and 24 ) that constitute the contents to be cooked together with the first contents 2a into the packaging bag 5A, as in the case of the packaging bag 1, and then heats and cooks the contents (first contents 2a and second contents 2b) in a microwave oven. As in the first embodiment, 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.

[0196] 30 to 34 is manufactured by making a bag using the film 10. The film 10 used for the packaging bag 5 (packaging bag 5A) is the same as that in the first embodiment, and therefore description thereof will be omitted.

[0197] Next, an example of the configuration of a packaging bag 5 using film 10 will be described with reference to Figures 30 to 34. [Packaging Bag] The packaging bag 5 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 second embodiment, too, the side of the bag body 11 on which the flap 12 is arranged will be referred to as the surface (or front), and the side of the bag body 11 on which the flap 12 is not arranged will be referred to as the bottom (or back or rear).

[0198] <Bag body> The bag body 11 is a flat, cylindrical body closed on three sides when viewed from the surface (or bottom). An example of the length L1 (mm) of the bag body 11 in the first direction is 180 mm or more and 230 mm or less. An example of the length L2 (mm) of the bag body 11 in the second direction is 150 mm or more and 200 mm or less. The first direction corresponds to the vertical direction of the bag body 11. The second direction is a direction intersecting the first direction. The second direction corresponds to the width direction or lateral direction of the bag body 11. In the following description, the second direction is perpendicular to the first direction. The first direction and the second direction may also be referred to as the Y direction and X direction shown in FIG. 30 , as in the first embodiment.

[0199] The bag body 11 has a first body portion 11A and a second body portion 11B along the Y direction (first direction). The first body portion 11A and the second body portion 11B are two portions of the bag body 11 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.

[0200] In the bag body 11, the second body 11B is a portion that accommodates the contents 2 (first contents 2a and second contents 2b) during cooking, and the first body 11A is a portion from which the contents 2 are removed after cooking. From the viewpoint of ensuring space for accommodating the contents 2 in the second body 11B, the length L1b (mm) from the boundary 13 to the second tip 11d may be longer than the length L1a (mm) from the boundary 13 to the first tip 11a. An example of the length L1a (mm) is 40 mm or more and 55 mm or less. An example of the length L1b (mm) is 120 mm or more and 190 mm or less.

[0201] The first body portion 11A has a first bottom film portion 111A (see FIG. 32) and a first surface film portion 112A. The first bottom film portion 111A and the first surface film portion 112A are portions of the film 10 that constitute the first body portion 11A.

[0202] The first body 11A has a first tip 11a, a side edge 11b, and a side edge 11c. The first tip 11a is an end of the first body 11A located opposite the second body 11B in the first direction and extends along a second direction intersecting the first direction. The side edge 11b and the side edge 11c are a pair of side edges (a pair of first side edges) of the first body 11A when the first body 11A is viewed from above and extend along the first direction.

[0203] The plan view of the first body 11A refers to the first body 11A viewed from the front side or the first front film portion 112A side, or the bottom side (rear side) or the first bottom film portion 111A side. The plan view of the first body 11A corresponds to the first body 11A viewed from the thickness direction.

[0204] The first body portion 11A has a sealed portion 11Sa formed by sealing the first tip portion 11a, and sealed portions 11Sb and 11Sc formed by sealing the side edge portions 11b and 11c. Sealed portions 11Sa, 11Sb, and 11Sc are formed by heat-sealing the first bottom film portion 111A and the first surface film portion 112A. Sealed portions 11Sb and 11Sc extend from both ends of sealed portion 11Sa toward the second body portion 11B.

[0205] An example of the seal width (length in the Y direction) of the seal portion 11Sa is 8 mm or more and 12 mm or less. An example of the seal width (length in the X direction) of the seal portion 11Sb and the seal portion 11Sc is 8 mm or more and 12 mm or less. Unless otherwise specified below, the seal widths of the seal portion 11Sb and the seal portion 11Sc are the same, and the seal widths of the seal portion 11Sb and the seal portion 11Sc are the same along the Y direction.

[0206] The first body portion 11A is a portion used to remove the contents 2 after cooking the contents 2 in the packaging bag 5 (packaging bag 5A) containing the contents 2. To remove the contents 2, a consumer tears (or breaks) the intended opening portion (first intended opening portion) 21 (see FIG. 31 ) located near the sealed portion 11Sa of the first body portion 11A to open the first body portion 11A. The intended opening portion 21 is located between the sealed portion 11Sa and the boundary portion 13. An example of the length L3 (mm) between the intended opening portion 21 and the boundary portion 13 of the first body portion 11A is 25 mm or more and 45 mm or less. The intended opening portion 21 may have an opening trigger portion 211 (see FIG. 31 ) formed on at least one of the side edge portion 11b and the side edge portion 11c. In the packaging bag 5 described in the second embodiment, the opening trigger portion 211 is formed on each of the side edge portion 11b and the side edge portion 11c. The opening trigger portion 211 is a portion that indicates the opening position and is a portion that is to be the starting point for opening, and is, for example, a notch.

[0207] The intended opening portion 21 may have an opening guide line extending in the X direction. The opening guide line is a line that supports (or guides) 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.

[0208] An example of the opening guide line is an easy-open mechanism (or a fragile portion) that allows the first body portion 11A to be torn with a finger. The easy-open mechanism may be a mechanism known in the art. For example, the easy-open mechanism may be realized by half-cutting at least one of the first bottom film portion 111A and the first surface film portion 112A, or by utilizing the molecular orientation of the film 10.

[0209] If the intended opening portion 21 is configured, for example, to break the flap 12 by utilizing the molecular orientation of the film 10, the intended opening portion 21 may be made visible, for example, by showing a line along the intended opening portion 21 by printing, etc.

[0210] The second body portion 11B has a second bottom film portion 111B (see FIG. 32) and a second surface film portion 112B. The second bottom film portion 111B and the second surface film portion 112B are 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 5. 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.

[0211] The second body 11B has a second tip 11d, a side edge 11e, and a side edge 11f. The second tip 11d is an end of the second body 11B located opposite the first body 11A in the first direction and extends along the X direction (second direction). The side edge 11e and the side edge 11f are a pair of side edges (a pair of second side edges) of the second body 11B when the second body 11B is viewed from above and extend along the Y direction (first direction).

[0212] The plan view of the second body portion 11B refers to the view of the second body portion 11B from the front side or the second front film portion 112B side, or from the bottom side (rear side) or the second bottom film portion 111B side. The plan view of the second body portion 11B corresponds to the view of the second body portion 11B from the thickness direction.

[0213] The second body 11B has a sealed portion 11Se and a sealed portion 11Sf formed by sealing the side edge portions 11e and 11f. The sealed portion 11Se and the sealed portion 11Sf are formed by heat-sealing the second bottom film portion 111B and the second surface film portion 112B. The sealed portion 11Se and the sealed portion 11Sf extend from both ends of the second tip portion 11d toward the first body 11A.

[0214] An example of the seal width (length in the X direction) of the sealed portion 11Se and the sealed portion 11Sf is the same as the example of the seal width of the sealed portion 11Sb and the sealed portion 11Sc. Hereinafter, unless otherwise specified, the seal width of the sealed portion 11Se and the sealed portion 11Sf is the same, the seal width of each of the sealed portions 11Se and 11Sf is the same along the Y direction, the seal width of the sealed portion 11Se is the same as the seal width of the sealed portion 11Sb, and the seal width of the sealed portion 11Sf is the same as the seal width of the sealed portion 11Sc. An example of the length L4 (mm) between the sealed portion 11Se and the sealed portion 11Sf (see FIG. 30) is 130 mm or more and 180 mm or less. The length L4 corresponds to the inner dimension of the packaging bag 5.

[0215] In sealed portion 11Se and sealed portion 11Sf, a linear mark (hereinafter referred to as "linear mark 16") may be formed along the X direction at the position of first tip 11a when first body portion 11A is folded back toward second body portion 11B around boundary portion 13. Specifically, linear mark 16 may be formed at a position where length L5 (mm) from linear mark 16 to boundary portion 13 is substantially the same as length L1a (mm) from boundary portion 13 to first tip 11a. Linear mark 16 is a mark caused by pressing the portion corresponding to first body portion 11A against the portion corresponding to second body portion 11B during the manufacturing process of packaging bag 5.

[0216] In the packaging bag 5 shown in Figures 30 to 33, the second tip 11d is open. The open second tip 11d functions as a supply port 14 for filling the second body 11B with the first contents 2a, and the internal space of the second body 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 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 11B. Therefore, the packaging bag 5A has a seal portion 11Sd formed by sealing the second tip 11d, as shown in Figure 34.

[0217] <Flap> The flap 12 functions as an insertion portion through which the consumer inserts the second contents 2b into the second body portion 11B. As in the first embodiment, 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 a part of the film 10 and is continuously connected to the first surface film portion 112A. The second side film portion 121B is a part of the film 10 and is continuously connected to the second surface film portion 112B.

[0218] The boundary 13 between the flap 12 and the bag main body 11 may be the portion where the flap 12 is connected to the bag main body 11 when the inner surfaces of the first side film portion 121A and the second side film portion 121B are in contact. The boundary 13 may be the portion that serves as the swing axis (or rotation axis) when the flap 12 is swung relative to the bag main body 11 when the inner surfaces of the first side film portion 121A and the second side film portion 121B are in contact. For example, the center position in the X direction between the boundary line between the first side film portion 121A and the first surface film portion 112A and the boundary line between the second side film portion 121B and the second surface film portion 112B may be considered to be the boundary 13.

[0219] The flap 12 has a tip 12a, a side edge 12b, and a side edge 12c. The tip 12a is the end of the flap 12 opposite the bag body 11 and extends along the X direction. The side edge 12b and the side edge 12c extend along a direction intersecting the X direction when the flap 12 is viewed in a plan view. In the second embodiment, the side edge 12b and the side edge 12c are each perpendicular to the extension direction of the tip 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 from the thickness direction. The side edge 12b and the side edge 12c are a pair of side edges (a pair of third side edges) of the flap 12.

[0220] 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.

[0221] An example of the seal width (length in the direction perpendicular to the boundary 13) of the seal portion 12Sa is 5 mm or more and 10 mm or less. An example of the seal width (length in the X direction) of the seal portion 12Sb and the seal portion 12Sc is the same as the example of the seal width of the seal portion 11Sb and the seal portion 11Sc. Unless otherwise specified below, the seal width of the seal portion 12Sb and the seal portion 12Sc is the same, the seal width of the seal portion 12Sb and the seal portion 12Sc is the same along the direction perpendicular to the boundary 13, the seal width of the seal portion 12Sb is the same as the seal width of the seal portion 11Sb, and the seal width of the seal portion 12Sc is the same as the seal width of the seal portion 11Sc.

[0222] 30 , the length L6 (mm) between the boundary portion 13 and the tip portion 12a may be shorter than the length L1a (mm) between the boundary portion 13 and the first tip portion 11a. In other words, the flap 12 may be smaller in size when viewed in plan than the first body portion 11A. An example of the length L6 (mm) is 35 mm or more and 50 mm or less.

[0223] The flap 12 is opened at the intended opening portion (second intended opening portion) 22 to allow the second contents 2b to be poured from the flap 12 into the second body portion 11B. The intended opening portion 22 is located between the seal portion 12Sa and the boundary portion 13. An example of the length L7 (mm) between the intended opening portion 22 and the boundary portion 13 is 25 mm or more and 40 mm or less. The length L7 may be different from or the same as the length L3 (see FIG. 31 ).

[0224] The opening portion 22 may have an opening trigger 221 on at least one of the side edge 12b and the side edge 12c at the opening position. The opening trigger 221 is a portion that indicates the opening portion 22 and is also a portion that serves as the starting point for opening by tearing (or breaking) the flap 12 in order to pour the second content 2b from the flap 12 into the second body portion 11B, and is, for example, a notch.

[0225] If the length L7 is the same as the length L3, when the flap 12 is folded down toward the first body portion 11A, the opening trigger portion 221 overlaps the opening trigger portion 211. Therefore, for example, when manufacturing the packaging bag 5, the opening trigger portion 211 and the opening trigger portion 221 can be formed together.

[0226] When the size of the flap 12 is smaller than the size of the first body portion 11A (when the length L6 is shorter than the length L1a), the opening trigger portions 211, 221 may be formed so that the positions of the opening trigger portion 211 and the opening trigger portion 221 relative to the boundary portion 13 are different in a plan view when the flap 12 is folded toward the first body portion 11A. That is, the length L7 and the length L3 may be different. The flap 12 and the first body portion 11A have different functions and therefore different opening timings. When the positions of the opening trigger portion 211 and the opening trigger portion 221 are different relative to the boundary portion 13, the opening trigger portion 211 and the opening trigger portion 221 are easily visible, making it less likely that the opening timing of the first body portion 11A and the flap 12 will be incorrect. This makes it easier to open the flap 12 and the first body portion 11A in the order recommended by the manufacturer of the packaging bag 5. In particular, it is effective that the opening trigger portion 211 is formed so that, when viewed in a plane with the flap 12 folded toward the first body portion 11A, the length L3 between the opening trigger portion 211 and the boundary portion 13 is longer than the length L7.

[0227] Although the positional relationship between the opening trigger portion 211 and the opening trigger portion 221 has been described as an example, the same effect is obtained when the intended opening portion 21 and the intended opening portion 22 are positioned differently relative to the boundary portion 13. Normally, when the size of the flap 12 is different from the size of the first body portion 11A, the size of the flap 12 is smaller, but the size of the flap 12 may be larger than the size of the first body portion 11A. Even in this case, the above-described effect can be obtained by the intended opening portion 21 and the intended opening portion 22 being positioned differently relative to the boundary portion 13.

[0228] The intended opening portion 22 may have an opening guide line extending in the X direction. The opening guide line is a line that supports opening when the consumer tears (or breaks) the flap 12 to open the package in order to insert 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.

[0229] 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. For example, the easy-open mechanism may be realized by half-cutting at least one of the first side film portion 121A and the second side film portion 121B, or may be realized by utilizing the molecular orientation of the film 10.

[0230] If the intended opening portion 22 is configured, for example, to break the flap 12 by utilizing the molecular orientation of the film 10, the intended opening portion 22 may be made visible, for example, by showing a line along the intended opening portion 22 by printing, etc.

[0231] The flap 12 has a zipper tape 30 between the opening portion 22 and the boundary portion 13, and a watertight seal portion 40 between the zipper tape 30 and the boundary portion 13.

[0232] 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.

[0233] In the packaging bag 5 described in the second embodiment, a steam vent portion 15 is provided in a part of the fastener tape 30 for discharging steam generated in the packaging bag 5 (packaging bag 5A) containing the contents 2 from the packaging bag 5A during cooking in a microwave oven. The steam vent portion 15 is an automatic steam vent mechanism configured to automatically release steam when the pressure of steam generated in the packaging bag 5A reaches a predetermined pressure during cooking.

[0234] The vapor release portion 15 of the second 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 vapor release portion 15 is more easily unzipped than other portions. The weak bite portion serving as the vapor release portion 15 only needs to be configured so that, when only the weak bite portion is cut out from the zipper tape 30, the two components constituting the weak bite portion (the male member 32 and the female member 33 shown in FIG. 6 ) can be separated without getting caught. The weak bite portion can be formed by crushing a portion of the interlocking portion 31. The interlocking portion 31 may be crushed, for example, by heating, pressing, or the like. The vapor release portion 15 may be located in the center of the zipper tape 30 in the width direction (X direction).

[0235] The length of the steam release portion 15 in the X direction is, for example, 25% or less of the length L4 (mm), which is the inner dimension of the packaging bag 5. For example, when the length L4 is 130 mm, the length of the steam release portion 15 in the X direction is 40 mm or less. The length of the steam release portion 15 in the X direction may be 10% or more of the length L4 (mm). By making the length of the steam release portion 15 in the X direction 25% or less of the length L4, it is possible to prevent the contents 2 from spilling out even if the steam release portion 15 is opened during microwave heating, and since the steam release portion 15 is not opened more than necessary, it is also possible to obtain a sufficient steaming effect. When the length of the steam release portion 15 in the X direction is 10% or more of the length L4, it is possible to more effectively prevent the steam release portion 15 from closing even if the bag body 11 expands during microwave heating.

[0236] An example of the length L8 (mm) between the center line (center position) 15a of the steam release portion 15 and the boundary portion 13 in a direction perpendicular to the width direction of the flap 12 (or a direction perpendicular to the boundary portion 13) is 13 mm or more and 24 mm or less. The position of the center line 15a in the Y direction corresponds to the position of the center line α shown in FIG. 5. When the flap 12 is folded toward the first body portion 11A, and the first tip end 11a is used as the reference, an example of the length between the first tip end 11a and the center line 15a is 20 mm or more and 40 mm or less. In the example shown in FIG. 30 , the center line 15a of the steam release portion 15 coincides with the center line of the zipper tape 30 (or the center line of the bite portion 31) in a direction perpendicular to the width direction of the flap 12. The length L8 may be shorter than the length L3. That is, when viewed from above with the flap 12 folded down toward the first body portion 11A, the steam release portion 15 may be located closer to the boundary portion 13 than the intended opening portion 21. Furthermore, the steam release portion 15 (specifically, the center line 15a) and the intended opening portions 21 and 22 may be positioned so as to satisfy the following relationship. That is, when viewed from above with the flap 12 folded down toward the first body portion 11A, the position of the steam release portion 15 may be closer to the boundary portion 13 than the intended opening portions 21 and 22, and the intended opening portions 21 and 22 may be located in the same position, or the intended opening portion 22 may be located closer to the boundary portion 13 than the intended opening portion 21. In other words, the lengths L3, L7, and L8 may satisfy the following relationship: L8<L7≦L3

[0237] The watertight seal portion 40 is a portion that separates the zipper tape 30 from the internal space of the bag body 11. In the second 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 line in Fig. 30. The wavy seal portion shown by the dashed line in Fig. 30 is referred to as a wavy seal 42.

[0238] An example of the length of the watertight seal portion 40 in a direction perpendicular to the width direction of the flap 12 is 3 mm or more and 5 mm or less. The end of the watertight seal portion 40 closest to the boundary portion 13 is referred to as the "lower end 40a." An example of the length L8a (mm) between the lower end 40a and the boundary portion 13 is 2 mm or more and 10 mm or less. In this case, an example of the length L8b (= L8 - L8a) between the lower end 40a and the center line 15a is 11 mm or more and 14 mm or less.

[0239] 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.

[0240] An example of the configuration of the zipper tape 30 and the watertight seal portion 40 is the same as that shown in FIG. 5 in the first embodiment, and therefore a description thereof will be omitted.

[0241] The packaging bag 5 is configured to satisfy the following condition 1. [Condition 1] P1≧2 (1) where P1=L2 / (L1a+L8)

[0242] That is, the packaging bag 5 is configured so that the ratio P1 (= L2 / (L1a + L8)) of the widthwise length L2 of the bag body 11 to the sum (L1a + L8) of the length L1a between the first tip 11a and the boundary 13 and the length L8 between the boundary 13 and the center line 15a is 2 or more.

[0243] The ratio P1 may be greater than 2.3, for example, 2.4 or greater, or, for example, 3.3 or less.

[0244] The packaging bag 5 may be configured to further satisfy the following condition 2: [Condition 2] 0<P2<0.55 (2) where P2=L8a / L8

[0245] That is, the packaging bag 5 may be configured so that the ratio P2 (=L8a / L8) of the length L8a between the lower end 40a of the watertight seal portion 40 and the boundary portion 13 to the length L8 between the boundary portion 13 and the center line 15a is greater than 0 and less than 0.55. The ratio P2 may be, for example, 0.54 or less.

[0246] The packaging bag 5 may be configured to satisfy the following condition 3A or 3B. [Condition 3A] P1>2.3 (3a-1) 0<P2≦0.43 (3a-2) [Condition 3B] P1≧2 (3b-1) 0.35≦P2≦0.43 (3b-2)

[0247] That is, the packaging bag 5 may be configured so that the ratio P1 is greater than 2.3 and the ratio P2 is greater than 0 and not greater than 0.43, or so that the ratio P1 is greater than 2.3 and the ratio P2 is greater than 0 and not greater than 0.43, or so that the ratio P1 is greater than 2 and the ratio P2 is greater than 0.35 and not greater than 0.43. Condition 3A corresponds to the case where, when Conditions 1 and 2 are satisfied, Formula (1) is replaced with Formula (3a-1) and Formula (2) in Condition 2 is replaced with Formula (3a-1). Condition 3B corresponds to the case where, when Conditions 1 and 2 are satisfied, Formula (2) in Condition 2 is replaced with Formula (3a-2).

[0248] The packaging bag 5 may be configured to satisfy Condition 1 and Condition 2, or Condition 3A or Condition 3B, and also to satisfy the following Condition 4:

[0249] [Condition 4] 2.8<P3<4 (4) where P3=L1 / L1a

[0250] That is, the packaging bag 5 may be configured so as to satisfy conditions 1 and 2 or conditions 3A and 3B, and so that the ratio P3 (= L1 / L1a) of the length L1 in the vertical direction of the bag body 11 to the length L1a between the first tip end 11a and the boundary portion 13 is greater than 2.8 and less than 4. The ratio P3 may be 2.9 or greater, or 3.5 or less.

[0251] [Method for Manufacturing Packaging Bag] Next, a description will be given of one embodiment of a method for manufacturing the packaging bag 5. Hereinafter, a method for manufacturing the packaging bag 5 having the zipper tape 30 and the watertight seal portion 40 described with reference to Fig. 5 will be described.

[0252] The method for manufacturing the packaging bag 5 includes an intermediate manufacturing step, a steam release section forming step, a side edge sealing step, and a folding step. The intermediate manufacturing step, the steam release section forming step, the side edge sealing step, and the folding step are the same as those described in the first embodiment using Figures 7 to 11, and therefore descriptions thereof will be omitted.

[0253] If the packaging bag 5 has opening guide lines as the intended opening portions 21, 22, the opening guide lines may be formed in advance in the film 10 at the locations that will become the intended opening portions 21, 22 before the intermediate 50 (see Figure 12) is formed.

[0254] In the manufacturing process of the packaging bag 5, the second tip 502a of the second portion 502 is not sealed, as in the first embodiment. Therefore, the second tip 11d corresponding to the second tip 502a functions as the supply port 14. After manufacturing the packaging bag 5, the first contents 2a are supplied through the supply port 14 (supply process). Thereafter, the supply port 14 formed in the second body 11B (second portion 502) is sealed to obtain the packaging bag 5A (supply port sealing process). The packaging bag 5A manufactured as described above is sold as a product in stores, etc.

[0255] An example of the intermediate manufacturing step included in the manufacturing method of the packaging bag 5 is the same as the first example of the intermediate manufacturing method described in the first embodiment with reference to FIGS.

[0256] In the example of the intermediate manufacturing method of the second embodiment, the intermediate 50 may also be manufactured using a strip-shaped film 10 extending along the second predetermined direction t (see FIGS. 8 to 10 ). 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 sequentially 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 5 corresponding to the multiple intermediates 50. In this case, the multiple packaging bags 5 are connected along the second predetermined direction t, and each packaging bag 5 can be obtained by separating the multiple packaging bags 5.

[0257] [How to use the packaging bag] When a consumer who has purchased the packaging bag 5 (packaging bag 5A) containing the first contents 2a uses the packaging bag 5A, the way of using the packaging bag 5A is the same as the way of using the packaging bag 1 (packaging bag 1A) described in the first embodiment using Figures 21 to 26.

[0258] In the following description, the sealed portions 11Sa, 11Sb, 11Sc, 11Sd, 11Se, 11Sf, 12Sb, and 12Sc of the packaging bag 5A in which the contents 2 are sealed will be referred to as the heat-sealed portion S (see Figure 34).

[0259] The manufacturing method of the packaging bag 5 described in the second embodiment can manufacture the packaging bag 5 shown in Figures 30 to 33. By filling the packaging bag 5 with the first content 2a, the packaging bag 5A shown in Figure 34 can also be obtained.

[0260] The packaging bag 5 is a flat-laying type packaging bag, as in the first embodiment. Standing-type packaging bags are also known as packaging bag configurations. Standing-type packaging bags are generally manufactured with the assumption that the packaging bag will be placed upright during microwave heating. Because microwave ovens are generally shorter in height than in width, the height of a standing-type packaging bag is more limited. In contrast, in a flat-laying type, the packaging bag 5 containing the first contents 2a is placed horizontally in the microwave oven, as in the case where the packaging bag 1 in FIG. 25 is replaced with the packaging bag 5, so the height restriction is more relaxed than for a standing-type packaging bag. Therefore, the flat-laying type packaging bag 5 can more easily ensure a capacity than a standing-type packaging bag, and can even achieve a larger capacity. In particular, it is easy to ensure a capacity even in a case where the packaging bag 5 does not have a gusset, as in the case of the packaging bag 5 shown in FIG. 30 .

[0261] In the packaging bag 5, the zipper tape 30 is provided on the flap 12 connected to the bag body 11, but the zipper tape 30 is not provided on the bag body 11 in which the first contents 2a are stored. Therefore, even if the first contents 2a are liquid, for example, the first contents 2a are unlikely to leak out of the packaging bag 5.

[0262] The flat-laying type packaging bag 5 has relaxed height restrictions, making it easy to change the size (volume) according to consumer needs. Since the packaging bag 5 is placed flat in the microwave oven, the packaging bag 5 does not tip over during cooking. Therefore, the packaging bag 5 does not need a structure to prevent tipping over. Since the contents 2 are cooked while the packaging bag 5 is placed flat in the microwave oven, uneven cooking of the contents 2 is less likely to occur.

[0263] The packaging bag 5 is sold with a first content 2a (e.g., a cooking seasoning liquid) stored therein. A consumer who purchases the packaging bag 5 containing the first content 2a can easily prepare the consumer's desired dish by adding fresh second content 2b (foodstuffs, toppings, etc.) just before cooking. As described above, since fresh second content 2b can be added to the packaging bag 5 before cooking in a microwave oven, the flavor and nutritional value of the foodstuffs, etc., as the second content 2b, are less likely to be lost.

[0264] The packaging bag 5 has the steam vent portion 15, which allows the packaging bag 5 containing the contents 2 to automatically vent steam generated when the packaging bag 5 is heated in a microwave oven. This prevents the packaging bag 5A from bursting during heating in a microwave oven. As described above, the packaging bag 5 (packaging bag 5A) has the function of automatically venting steam generated during heating, and therefore the packaging bag 5 also ensures safety, for example, by preventing burns to fingers when handling the packaging bag 5A after cooking.

[0265] One of the advantages of cooking using a microwave oven is that it does not require fire. By using the packaging bag 5, cooking can be performed using a microwave oven, and cooking can be performed without using fire, as described above. After placing second contents 2b such as ingredients into the packaging bag 5, the contents 2 including the second contents 2b can be cooked by heating in a microwave oven. Therefore, using the packaging bag 5 makes cooking easy and reduces the effort and time required to clean up pots, cooking utensils, and tableware after cooking.

[0266] Before the first contents 2a are supplied to the packaging bag 5, 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 5. For example, when the first contents 2a are poured into the packaging bag 5 to obtain the packaging bag 5A, 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.

[0267] The first body 11A of the packaging bag 5 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 removed 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 remove the contents 2 from the first body 11A than from the flap 12, for example.

[0268] In the packaging bag 5, the zipper tape 30 is attached to the flap 12, not to the bag body 11 in which the first content 2a is contained. In the packaging bag 5, if the watertight seal portion 40 is provided on the flap 12, even if the packaging bag 5A is dropped during distribution or the like, the effect on the watertight seal portion 40 can be reduced. The effect in this respect is the same as that described in the first embodiment using Figure 29.

[0269] The packaging bag 5 is configured to satisfy condition 1. In this case, when the packaging bag 5 (packaging bag 5A) containing the contents 2 is heated in a microwave oven, microwave heating can be performed while suppressing steam leakage and popping noises from the heat-sealed portions S (sealed portions 11Sa, 11Sb, 11Sc, 11Sd, 11Se, 11Sf, 12Sb, and 12Sc) of the packaging bag 5A placed in the microwave oven. When the ratio P1 is greater than 2.3 (for example, 2.4 or greater), it is possible to properly release steam from the steam release portion 15 while suppressing steam leakage from portions of the zipper tape 30 other than the steam release portion 15, and popping noises can be prevented.

[0270] When the packaging bag 5 is configured to further satisfy condition 2, the packaging bag 5 is resistant to being dropped. Therefore, even if the packaging bag 5 (or packaging bag 5A) is dropped, for example, during transportation, when a user purchases the packaging bag 5, or when a user uses the packaging bag 5 to cook, the desired state can be maintained. For example, even if the packaging bag 5 (or packaging bag 5A) containing the first contents 2a or contents 2 is dropped, the first contents 2a or contents 2 can be prevented from leaking from the bag body 11 and from entering the flap 12 toward the tip portion 12a of the watertight seal portion 40.

[0271] When the packaging bag 5 is configured to satisfy condition 3A or condition 3B, it is possible to properly release steam from the steam release section 15 while suppressing steam from escaping from any part of the zipper tape 30 other than the steam release section 15, thereby preventing popping sounds and also providing the drop resistance described above.

[0272] When the packaging bag 5 is configured to further satisfy condition 4, the packaging bag 5 can be suitably manufactured by the manufacturing method described with reference to FIGS.

[0273] The method for manufacturing the packaging bag 5 is the same as the manufacturing method described in the first embodiment with reference to Figures 7 to 16. Therefore, the effects of the manufacturing method for the packaging bag 5 are the same as the effects of the manufacturing method of the first embodiment.

[0274] The packaging bag 5 manufactured by the manufacturing method described in the second embodiment has undergone the folding process, and therefore the first body portion 11A and the flap 12 overlap as described in the first embodiment. The packaging bag 5 manufactured by the manufacturing method described in the second embodiment also has the effects described in the first embodiment using Figures 27 and 28.

[0275] When a packaging bag 5 (packaging bag 5A) containing contents 2 is heated in a microwave oven, second body portion 11B expands. When a certain pressure is reached inside packaging bag 5A, steam is released through steam release portion 15, reducing the pressure inside packaging bag 5A. At this time, in a configuration in which line marks 16 are formed on packaging bag 5 (packaging bag 5A), the presence of line marks 16 generates a certain tension in second body portion 11B of packaging bag 5A. This tension prevents the maximum expansion portion of second body portion 11B from sinking lower than the position of steam release portion 15 when steam is released through steam release portion 15 of packaging bag 5A during microwave heating. As a result, the risk of contents 2 spraying out from steam release portion 15 during microwave heating can be reduced.

[0276] Next, experimental examples will be described. In the description of the experimental examples, for the sake of convenience, the same elements as those in the description of the above embodiments will be designated by the same reference numerals, and duplicated explanations will be omitted. For the sake of convenience, the same applies to comparative experimental examples that do not satisfy the condition of formula (2).

[0277] In Experimental Example 1, a packaging bag 5 shown in Figures 30 to 33 was produced using one film 10 by the production method described above with reference to Figures 8 to 17. As shown in Figure 7, the film 10 had a sealant layer F1 and a resin substrate layer F2. The resin substrate layer F2 was a laminate formed by bonding together a 12 μm thick ethylene terephthalate (PET) film and a 15 μm thick biaxially oriented nylon (ONY) film with an adhesive.

[0278] The lengths L1, L1a, L2, L4, L5, L6, L8 and L8a of the packaging bag 5 in Experimental Example 1 were as follows: L1 = 200 mm, L1a = L5 = 70 mm, L2 = 200 mm, L4 = 180 mm, L6 = 50 mm, L8 = 18 mm, L8a = 5 mm.

[0279] The seal width of the seal portion 11Sa was 10 mm, the seal width of the seal portion 12Sa was 5 mm, and the seal widths of the seal portions 11Sb, 11Sc, 11Se, 11Sf, 12Sb, and 12Sc were 10 mm.

[0280] The zipper tape 30 used was MFP-339Z3 manufactured by Idemitsu Unitech Co., Ltd. In Experimental Example 1, a steam release portion 15 was formed in the center in the X direction of the engaging portion 31 of the zipper tape 30. The length of the steam release portion 15 in the X direction was 11.1% of the length L2. The watertight seal portion 40 was formed by peelably joining a watertight film 41 to the inner surface of the first side film portion 121A. The watertight seal portion 40 was joined to the inner surface of the first side film portion 121A by a wavy seal 42.

[0281] <Bag-making Suitability Evaluation> When 50 packaging bags 5 were manufactured based on the manufacturing method described with reference to Figures 8 to 17, the packaging bags 5 were evaluated for suitability based on the following criteria. - Evaluation A: All 50 bags satisfy (a1), (a2), and (a3). (a1) The third portion 503 (first body portion 11A) can be folded back in the folding process. (a2) The wavy seal 42 (watertight seal portion 40) does not peel off due to the load when the third portion 503 is folded back in the folding process. (a3) ​​When the third portion 503 is folded back in the folding process, the interlocking portion 31 other than the steam release portion 15 does not deform. - Evaluation B: Since there were cases where any of the above (a1), (a2), and (a3) ​​was not satisfied, it was necessary to determine whether the packaging bags 5 were pass or fail in the manufacturing process of the packaging bags 5. - Evaluation C: None of the above (a1) to (a3) ​​was satisfied in any of the 50 bags.

[0282] <Microwave oven heating evaluation> 100 cc (100 cm) of water was poured into the packaging bag 5 of Experimental Example 1. ３ ) was filled, and then the sealed portion 11Sd was formed. The flap 12 was broken at the position of the intended opening portion 22, and the sealed portion 12Sa was removed. The packaging bag 5 filled with water was then heated in a microwave oven at 600 W for 2 minutes, and the state of the steam release portion 15 was evaluated according to the following evaluation criteria. Evaluation A: Only the steam release portion 15 of the zipper tape 30 was opened, steam escaped only from the steam release portion 15, and no popping sound was generated during microwave heating. Evaluation B: Portions of the zipper tape 30 other than the steam release portion 15 were also opened, steam escaped from portions other than the steam release portion 15, but no popping sound was generated during microwave heating. Evaluation C: Portions of the zipper tape 30 other than the steam release portion 15 were also opened, steam escaped from portions other than the steam release portion 15, and a popping sound was generated during microwave heating, or a portion of the sealed portion S was broken during heating, steam escaped from a portion of the sealed portion S during heating, and a popping sound was generated during microwave heating.

[0283] <Drop test> 100cc (100cm) of water was poured into the packaging bag 5. ３) was filled, and then the seal portion 11Sd was formed. The packaging bag 5 filled with water was stored at 5°C for at least 3 hours and then dropped from a height of 80 cm. This drop test was conducted 10 times. The results of the drop test were evaluated according to the following criteria. - Evaluation A: The results shown in the following (b1) and (b2) were obtained in all 10 drop tests. (b1) The contents (water) did not leak from the bag body. (b2) The contents (water) did not rise above the watertight seal portion (towards the tip). - Evaluation B: During the 10 drop tests, there were cases where either (b1) or (b2) above was not met.

[0284] The evaluation results of Experimental Example 1 are shown in Figure 35. The table in Figure 35 also shows the calculation results of the ratios P1, P2, and P3. The results shown in the items "Bag-making suitability," "Microwave heating," and "Drop test" in the table in Figure 35 are the results of the <Bag-making suitability evaluation>, <Microwave oven heating evaluation>, and <Drop test>.

[0285] [Experimental Example 2] In Experimental Example 2, packaging bags 5 were produced in the same manner as in Experimental Example 1, except that the length L1a (and length L5) and the length L2 were changed as follows: L1a = L5 = 50 mm L2 = 180 mm

[0286] The packaging bag 5 of Experimental Example 2 was subjected to the bag-making suitability evaluation, microwave heating evaluation, and drop test described in Experimental Example 1. The results of these evaluations are shown in the table of FIG.

[0287] [Experimental Example 3] In Experimental Example 3, packaging bags 5 were produced in the same manner as in Experimental Example 1, except that the lengths L1, L2, L1a (and L5), L8, and L8a were changed as follows: L1 = 210 mm, L1a = L5 = 60 mm, L2 = 160 mm, L8 = 20 mm, L8a = 7 mm.

[0288] The packaging bag 5 of Experimental Example 3 was subjected to the bag-making suitability evaluation, microwave heating evaluation, and drop test described in Experimental Example 1. The results of these evaluations are shown in FIG.

[0289] [Experimental Example 4] In Experimental Example 4, packaging bags 5 were produced in the same manner as in Experimental Example 1, except that the lengths L1a (and length L5), L2, L8, and L8a were changed as follows: L1a = L5 = 50 mm, L2 = 180 mm, L8 = 13 mm, and L8a = 0 mm.

[0290] The packaging bag 5 of Experimental Example 4 was subjected to the bag-making suitability evaluation, microwave heating evaluation, and drop test described in Experimental Example 1. The results of these evaluations are shown in FIG.

[0291] [Experimental Example 5] In Experimental Example 5, packaging bags 5 were produced in the same manner as in Experimental Example 1, except that the lengths L1a (and length L5), L2, L8, and L8a were changed as follows: L1a = L5 = 50 mm, L2 = 180 mm, L8 = 23 mm, L8a = 10 mm.

[0292] The packaging bag 5 of Experimental Example 5 was subjected to the bag-making suitability evaluation, microwave heating evaluation, and drop test described in Experimental Example 1. The results of these evaluations are shown in FIG.

[0293] [Experimental Example 6] In Experimental Example 6, packaging bags 5 were produced in the same manner as in Experimental Example 1, except that the lengths L1a (and length L5), L2, L8, and L8a were changed as follows: L1a = L5 = 50 mm, L2 = 180 mm, L8 = 28 mm, L8a = 15 mm.

[0294] The packaging bag 5 of Experimental Example 6 was subjected to the bag-making suitability evaluation, microwave oven heating evaluation, and drop test described in Experimental Example 1. The results of these evaluations are shown in FIG.

[0295] [Experimental Example 7] In Experimental Example 7, packaging bags 5 were produced in the same manner as in Experimental Example 1, except that the length L1a (and length L5) was changed as follows: L1a = L5 = 65 mm

[0296] The packaging bag 5 of Experimental Example 7 was subjected to the bag-making suitability evaluation, microwave heating evaluation, and drop test described in Experimental Example 1. The results of these evaluations are shown in FIG.

[0297] [Experimental Example 8] In Experimental Example 8, packaging bags 5 were produced in the same manner as in Experimental Example 1, except that the lengths L1, L1a (and L5), and L2 were changed as follows: L1 = 210 mm, L1a = L5 = 50 mm, and L2 = 150 mm.

[0298] The packaging bag 5 of Experimental Example 8 was subjected to the bag-making suitability evaluation, microwave heating evaluation, and drop test described in Experimental Example 1. The results of these evaluations are shown in FIG.

[0299] [Experimental Example 9] In Experimental Example 9, packaging bags 5 were produced in the same manner as in Experimental Example 1, except that the lengths L1a (and length L5), L2, L8, and L8a were changed as follows: L1a = L5 = 55 mm, L2 = 150 mm, L8 = 23 mm, L8a = 10 mm.

[0300] The packaging bag 5 of Experimental Example 9 was subjected to the bag-making suitability evaluation, microwave heating evaluation, and drop test described in Experimental Example 1. The results of these evaluations are shown in FIG.

[0301] [Experimental Example 10] In Experimental Example 10, packaging bags 5 were produced in the same manner as in Experimental Example 1, except that the lengths L1a (and length L5), L2, L8, and L8a were changed as follows: L1a = L5 = 45 mm, L2 = 150 mm, L8 = 13 mm, and L8a = 0 mm.

[0302] The packaging bag 5 of Experimental Example 10 was subjected to the bag-making suitability evaluation, microwave heating evaluation, and drop test described in Experimental Example 1. The results of these evaluations are shown in FIG.

[0303] [Consideration of the evaluation results of Experimental Examples 1 to 10] As mentioned above, Fig. 35 is a chart showing the evaluation results of Experimental Examples 1 to 10. As shown in Fig. 35, if the ratio P1 is 2 or greater, the result of the range evaluation is Rating A or Rating B. Therefore, when the packaging bag 5 is configured to satisfy Condition 1, it can be understood that the packaging bag 5 is a flat-type packaging bag having the flap 12 and is a packaging bag that can be suitably used for microwave heating.

[0304] Furthermore, when ratio P1 is greater than 2.3, and even greater than 2.4, the microwave heating evaluation is rated A, making it possible to selectively release steam through steam release portion 15 and also to prevent popping noises during microwave heating. Therefore, when ratio P1 is greater than 2.3, and even greater than 2.4, a packaging bag 5 that is more suitable for microwave heating can be provided.

[0305] 35, when the ratio P2 is greater than 0 and less than 0.55, the drop test result is rated A. Therefore, it has been verified that by configuring the packaging bag 5 to satisfy condition 2, the packaging bag 5 can be maintained in a desired state even if it is dropped when the packaging bag 5 is transported, when a user purchases the packaging bag 5, or when cooking with the packaging bag 5.

[0306] 35 shows that when the condition (condition 3A) that ratio P1 is 2.3 and ratio P2 is greater than 0 and less than 0.43 is satisfied, or the condition (condition 3B) that ratio P1 is 2 or greater and ratio P3 is 0.35 or greater and 0.43 or less is satisfied, an evaluation of A is obtained in both the microwave heating evaluation and the drop test. Therefore, it can be seen that when packaging bag 5 satisfies condition 3A or 3B, steam can be selectively released from steam release portion 15, popping sounds during microwave heating can be prevented, and the bag is drop resistant.

[0307] 35, it can be seen that packaging bag 5 can be appropriately manufactured by the manufacturing method described with reference to Figures 8 to 17 when condition 1 or condition 2 is satisfied and ratio P3 is greater than 2.8 and less than 4. In other words, it can be seen that when packaging bag 5 is configured to satisfy condition 4, it can be suitably manufactured by applying a manufacturing method including a folding step.

[0308] (Modifications) Next, modifications of the packaging bag 1 will be described. Fig. 36 is a plan view of a packaging bag according to a modification when viewed from the front. Fig. 37 is a plan view of the packaging bag 4 shown in Fig. 36 when viewed from the bottom. The packaging bag 4 shown in Figs. 36 and 37 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.

[0309] 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 FIG. 6. In this case, the heat-sealed surface of the gusset film 17 is formed by the sealant layer F1 (see FIG. 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.

[0310] 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.

[0311] 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 is formed with a supply port 14 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.

[0312] 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 sealed first tip 11a may be referred to as a packaging bag 4A. As shown in Figure 38, the packaging bag 4A has a seal portion 11Sa formed by sealing the first tip 11a. Figure 38 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.

[0313] Next, a description will be given of a method for manufacturing the packaging bag 4. 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. 39. Fig. 39 is a drawing for explaining the intermediate manufactured in the intermediate manufacturing step included in the first embodiment of the method for manufacturing the packaging bag 4.

[0314] The intermediate body 50A shown in FIG. 39 has a first portion 501, a second portion 502, and a third portion 503.

[0315] 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. The first portion 501 has a zipper tape 30 attached and a watertight seal portion 40 formed therein.

[0316] 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 on the first surface portion 51 and a 1b bag main body region 531 on 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.

[0317] 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 the 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.

[0318] 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.

[0319] An example of a method for producing the intermediate 50A (third example of the method for producing the intermediate) will now be described in detail.

[0320] [Third Example of Intermediate Manufacturing Process] In the third example, a method for manufacturing an intermediate 50A using one film 10 will be described, similar to the first example of the intermediate manufacturing process.

[0321] In the third example, as in the first example, the areas of the film 10 that are to become the first surface portion 51, the second surface portion 52, and the third surface portion 53 are simply referred to as the "first surface portion 51," the "second surface portion 52," and the "third surface portion 53."

[0322] The folding step is carried out in the same manner as in Example 1. That is, the film 10 is folded in the same manner as in Example 1 to form the first portion 501, the second portion 502, and the third portion 503.

[0323] 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.

[0324] 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 .

[0325] 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.

[0326] 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, and then the gusset region 80a and the second tip 502a are sealed to form the sealed portions 17Sa1 and 17Sa2.

[0327] 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 may 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 may 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 may be performed at any timing until the packaging bag 4 is completed, as long as it is after the gusset region 80a has been joined to the second tip portion 502a.

[0328] The watertight seal forming step and the first tip sealing step are the same as those in the first example.

[0329] The intermediate body 50A is manufactured by carrying out all the steps up to the gusset forming step, the watertight seal forming step, and the first tip sealing step.

[0330] 39 is produced in the intermediate production process, the steam release portion forming process, the side edge sealing process, and the folding process described in the production method of the packaging bag 1 are carried out on the intermediate 50A. As a result, the packaging bag 4 is obtained.

[0331] 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. The supply port 14 is then sealed (supply port sealing process). In a configuration in which the intermediate 50A is manufactured in an intermediate manufacturing process, the third tip 503a corresponds to the supply port 14, and therefore the supply port sealing process corresponds to the third tip sealing process. 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.

[0332] 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 40. Intermediate 50B is an intermediate manufactured using first film 10A and second film 10B, as in the second example of the intermediate manufacturing step. Figure 40 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.

[0333] 40 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 manufactured in each intermediate formation region 70. As shown in FIG. 40, 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.

[0334] The configuration of intermediate 50B in each intermediate formation area 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.

[0335] An example of a method for producing the intermediate body 50B will be specifically described.

[0336] [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.

[0337] 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."

[0338] 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 imaginary plane P. Therefore, the same processing is performed on the first intermediate formation region 71 and the second intermediate formation region 72, and therefore, the processing on the first intermediate formation region 71 will be mainly described below.

[0339] The film placement step is performed in the same manner as in Example 2. 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. This also forms the first portion 501 and the second portion 502, as in Example 2. In the film placement step, the plate 61 may be placed with the zipper tape 30 to which the watertight film 41 is attached, placed in the hole 61a, as in Example 2.

[0340] After the film placement step, the zipper tape attachment step is carried out in the same manner as in the second example.

[0341] After the fastener tape attaching step, the gusset forming step is performed. 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. 40 , 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.

[0342] As described above, in the fourth example, similar 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. 40 , 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.

[0343] After the gusset-forming film 80 is placed 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 seal portion 17Sa1 and the seal portion 17Sa2, and the gusset region 80a is fixed to the second portion 502.

[0344] In the gusset forming step, a gusset forming film 80 may be disposed 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.

[0345] 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.

[0346] By carrying out the watertight seal portion forming step and the first tip sealing step, the intermediate body 50B is manufactured in the first intermediate body forming region 71.

[0347] The intermediate manufacturing process has been described with a focus on manufacturing the intermediate 50B in the first intermediate formation region 71, but in each step of the intermediate manufacturing process, the same processing is also performed on the second intermediate formation region 72. Therefore, the intermediate 50B is also manufactured in the second intermediate formation region 72.

[0348] That is, in the fourth example of the intermediate manufacturing process, as in the second example, two intermediates 50B that are symmetrically arranged with respect to the imaginary plane P and that are connected to each other are manufactured.

[0349] When the fourth example of the intermediate manufacturing process is adopted, the two manufactured intermediates 50B are each subjected to the side edge sealing process, the steam vent forming process, the folding process, and the supply port forming process.

[0350] The supply port forming process is a process of opening the third tip portion 503a to form the supply port 14 in the third tip portion 503a. The supply port forming process is performed, for example, after the folding process. In the supply port forming process, the third tip portion 503a is cut to open it. 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. If a trimming process is performed to adjust the shape of the packaging bag 4 after the folding process, the supply port forming process may be performed during the trimming process. By opening the third tip portion 503a, the supply port 14 is formed in the first tip portion 11a (third tip portion 503a) of the first body portion 11A.

[0351] 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.

[0352] 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 from the supply port 14 of the first body 11A into the second body 11B. 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.

[0353] 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 process differs in relation to the above-mentioned differences in configuration. 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.

[0354] 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 is increased, and as a result, the capacity of the packaging bag 4 can be increased.

[0355] As a modified example of the packaging bag 1, a configuration in which the packaging bag has a gusset film 17 for forming a gusset attached to the second body portion 11B and a supply port 14 formed in the first body portion 11A has been described, but a similar modification can also be applied to the packaging bag 5. The packaging bag 5 in which the gusset film 17 for forming a gusset is attached to the second body portion 11B and a supply port 14 is formed in the first body portion 11A will be referred to as a "modified example of the packaging bag 5."

[0356] The packaging bag 5 according to the modified example can be manufactured in the same manner as the manufacturing method of the packaging bag 5, except that, for example, the intermediate 50A shown in Figure 39 is manufactured in the intermediate manufacturing step. The intermediate 50A in the manufacturing method of the packaging bag 5 according to the modified example can be manufactured by performing a gusset forming step, a watertight seal forming step, and a first leading edge sealing step after the zipper tape attaching step included in the intermediate manufacturing step described in the manufacturing method of the packaging bag 1. The order in which the gusset forming step, the watertight seal forming step, and the first leading edge sealing step are performed is not limited. The gusset forming step is a step of attaching a gusset-forming film 80 to the second leading edge 502a.

[0357] The packaging bag 5 according to the modified example has the same configuration as the packaging bag 5 according to the second embodiment, 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. Therefore, the packaging bag 5 according to the modified example has the same effects as the packaging bag 5 according to the modified example.

[0358] The packaging bag 5 according to the modified example has a gusset film 17, and a gusset is formed on the second tip end 11d side, which increases the capacity of the second body portion 11B, thereby enabling the packaging bag 5 according to the modified example to have a larger capacity.

[0359] 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.

[0360] For example, in the first embodiment, the vapor release portion may be formed in a location other than the zipper tape.

[0361] The method of forming the watertight seal is not limited to the illustrated embodiment. For example, the watertight seal can be formed by joining the ends of the bases of the male member 32 and the female member 33 together, or by joining watertight films fixed to the ends of the bases of the male member 32 and the female member 33 together. Alternatively, the watertight seal can be formed by joining parts of the first side film part and the second side film part.

[0362] The packaging bag may not have the line marks 16 shown in Figures 1, 2, 36, and 37. 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.

[0363] 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. Even in this case, the contents can be placed into the packaging bag through the flap 12 and cooked.

[0364] 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.

[0365] 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.

[0366] In the second embodiment, in the packaging bag 5 shown in Figures 30 to 33, the second tip 11d may be sealed instead of the first tip 11a even before the first contents 2a are poured into the packaging bag 5. In this case, the first tip 11a functions as a supply port for the first contents 2a, as in the case of the above-mentioned modified example.

[0367] The packaging bag according to the second embodiment may be manufactured by a method other than the manufacturing method exemplified above. For example, the packaging bag according to the second embodiment may be manufactured using two sheets of film 10.

[0368] The illustrated embodiments and modifications may be combined as appropriate without departing from the spirit of the present invention.

[0369] 1, 4, 5, 1A, 4A, 5A...packaging bag, 2...contents, 3...microwave oven, 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...sealed portion, 12...flap, 13...boundary portion, 14...supply port, 15...steam vent portion, 15a...center line, 16...line mark, 21...opening portion (first opening portion), 22...opening portion (second opening portion), 30...zipper tape, 32...male member (second zipper member), 33...female member (first zipper member), 40...watertight seal portion, 41...watertight film, 42...wavy seal, 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...third 2. 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, 521...second flap region, 522...seconda bag main body region, 531...firstb bag main body region, 532...secondb bag main body region, P...virtual surface.

Claims

1. A method for manufacturing a flat-type packaging bag for storing contents to be cooked in a microwave oven, comprising the steps of: manufacturing an intermediate having a first surface portion; and second and third surface portions disposed on the same side of the first surface portion and aligned along a first predetermined direction; wherein the first surface portion has a first flap region and a bag body region 1a which are aligned along the first predetermined direction; the second surface portion has a second flap region facing the first flap region and constituting a first portion of the intermediate body together with the first flap region; and a bag body region 2a which is bent relative to the second flap region in the opposite direction to the first surface portion; and the third surface portion has a bag body region 1b facing the bag body region 1a and constituting a second portion of the intermediate body together with the bag body region 1a; and a bag body region 2b which is bent relative to the bag body region 1b in the opposite direction to the first surface portion so as to face the bag body region 2a, and constituting a third portion of the intermediate body together with the bag body region 2a. a side edge sealing step of forming a steam release portion in the intermediate body; a side edge sealing step of forming a sealed portion in each of the first, second, and third portions by sealing both side edges of the first, second, and third portions in a second predetermined direction intersecting with the first predetermined direction, with the third portion folded down toward the second portion so that the secondb bag main body region is in contact with the firstb bag main body region; and a folding step of folding back the second portion toward the first portion, after the side edge sealing step and the steam release portion forming step have been performed, so that the seconda bag main body region is in contact with the first flap region.

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

3. The method for manufacturing a packaging bag according to claim 1, wherein the intermediate manufacturing step further includes a watertight seal forming step of forming a watertight seal in the first portion so as to separate the zipper tape from the second portion and the third portion until the zipper tape is first opened.

4. A method for manufacturing a packaging bag as described in claim 3, wherein 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 being formed to interlock with each other, one end of a watertight film for forming the watertight seal portion being 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 is releasably joined to the other of the first flap region and the second flap region.

5. The intermediate manufacturing process includes a folding process for 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 of the first portion and the second tip of the second portion are folded portions of the film, and the first heat-sealed surfaces of the film in regions corresponding to the seconda bag body region and the secondb bag body region, respectively, face each other; a third tip sealing process for sealing the third tip of the third portion; a first tip opening process for cutting the first tip to open the first tip; a supply port forming process for opening the second tip to form a supply port in the second tip for supplying a portion of the contents to the second portion; and a zipper tape attaching process for attaching a zipper tape to the first portion from which the first tip has been opened. a first leading end sealing step, which is carried out after the fastener tape attaching step, of sealing the opened first leading end.

6. The method for manufacturing a packaging bag according to claim 5, further comprising: 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.

7. The intermediate manufacturing process includes a folding process in which a sheet of film having a first heat-sealed surface is folded 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 of the first portion and the second tip of the second portion are folded portions of the film, and the first heat-sealed surfaces of the film in regions corresponding to the seconda bag body region and the secondb bag body region, respectively, face each other; a first tip opening process in which the first tip is opened; a zipper tape attaching process in which a zipper tape is attached to the first portion from which the first tip is opened; and a second tip opening process in which the second portion is opened.

5. The method for manufacturing a packaging bag according to claim 1, further comprising: a gusset forming step of attaching a gusset-forming film having a second heat-sealable surface and a gusset region for forming a gusset, the gusset-forming film being in a state of being folded so that the second heat-sealable 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.

8. The method for manufacturing a packaging bag according to claim 7, further comprising: a supplying step of supplying a portion of the contents from a third tip of the third portion to the second portion after the folding step; and a third tip sealing step of sealing the third tip after the supplying step.

9. A method for manufacturing a packaging bag according to any one of claims 1 to 4, wherein the intermediate manufacturing process comprises: a film arranging process of arranging a first film and a second film having a first heat-sealed surface so that the first heat-sealed surfaces face each other, and the second film is arranged opposite the first film in a state in which a part of the intermediate 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 forming region of the first film and the second film; a zipper tape attaching process of attaching zipper tape to the first portion; and a first tip sealing process of sealing the first tip.

10. The method for manufacturing a packaging bag according to claim 9, wherein the intermediate manufacturing process includes a third leading end sealing process for sealing a third leading end of the third portion between the film placement process and the zipper tape attachment process.

11. The method for manufacturing a packaging bag according to claim 9, further comprising: a supplying step of supplying a portion of the contents from a second tip of the second portion to the second portion after the folding step is carried out; and a second tip sealing step of sealing the second tip after the supplying step.

12. A method for manufacturing a packaging bag as described in claim 9, wherein two intermediate formation regions are set along the first predetermined direction on the first film and the second film, and in the intermediate manufacturing process, the steam release section forming process, the side edge sealing process, and the folding process are carried out on two intermediates located in the two intermediate formation regions in the first predetermined direction and symmetrical in an imaginary plane perpendicular to the first predetermined direction, and the two intermediates for which the steam release section forming process, the side edge sealing process, and the folding process have been carried out are separated.

13. A method for manufacturing a packaging bag as described in claim 9, further comprising a supply port forming step of forming a supply port at the third tip of the third part by opening the third tip, for supplying a portion of the contents to the second part, and wherein the intermediate manufacturing step comprises 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.

14. The method for manufacturing a packaging bag according to claim 13, further comprising: 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.

15. A method for manufacturing a packaging bag as described in claim 13, wherein two intermediate formation regions are set along 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, 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 are separated.

16. A flat-type packaging bag for cooking in a microwave oven, comprising: a bag body for containing contents to be cooked in a microwave oven; and a flap having first and second side film portions facing each other and connected to the bag body, wherein the bag body comprises: 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, 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 a first end 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 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 tip of the flap, which is located opposite the bag body and 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; and a zipper tape is provided on the flap.

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

18. The packaging bag according to claim 16, wherein a steam release section is formed in the zipper tape, a watertight seal section is formed in the flap for separating the zipper tape from the bag body, one of a second tip section of the second body section located opposite the first body section in the first direction and along a second direction intersecting the first direction is closed, and a ratio P1 of the length of the bag body in the second direction to the sum of the length between the boundary section and the first tip section and the length between the center position of the steam release section and the boundary section is 2 or more.

19. The packaging bag according to claim 18, wherein a ratio P2 of the length between the center position of the steam release portion and the boundary portion to the length between the lower end of the watertight seal portion and the boundary portion is greater than 0 and less than 0.

55.

20. The packaging bag according to claim 19, wherein the ratio P1 is greater than 2.3, and the ratio P2 is greater than 0 and equal to or less than 0.

43.

21. The packaging bag according to claim 19, wherein the ratio P2 is 0.35 or more and 0.43 or less.

22. The packaging bag according to claim 19, wherein a ratio P3 of the length of the bag body in the first direction to the length between the first tip and the boundary is greater than 2.8 and less than 4.

23. The packaging bag according to any one of claims 18 to 22, wherein the first end is sealed.

24. The packaging bag according to claim 23, wherein the steam release section is located closer to the boundary section than the intended opening section for opening the first body section when viewed in a plane with the flap folded down toward the first body section.

25. The packaging bag described in claim 24, wherein, when viewed in a plane with the flap folded down toward the first body, the steam release section is located closer to the boundary section than a first intended opening section for opening the first body section and a second intended opening section for opening the flap, and the first intended opening section and the second intended opening section are in the same position or the second intended opening section is closer to the boundary section than the first intended opening section.

26. The packaging bag according to any one of claims 18 to 22, wherein the watertight seal portion has a wavy seal that is sealed in a wavy pattern.

27. A packaging bag as claimed in any one of claims 16 to 22, wherein linear marks are formed along the second direction in at least the pair of second side edges of the second body portion at positions corresponding to the first tip when the first body portion is folded back towards the second body portion relative to the boundary portion.

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