Steam-through pouch

Abstract

To provide a steam-permeable pouch that allows steam to suitably pass through when heated.SOLUTION: A steam-permeable pouch 10 has: a pouch body 11 that is made up of a sheet 20 of a layered structure including a paper layer and a sealant layer and includes a storage space S; and a projection 12 projecting from the pouch body 11. The projection 12 has a steam-permeable part 50 to open when the storage space S shows a pressure increase. In a predetermined first region including at least a portion of the steam-permeable part 50, the layered structure of the sheet 20 includes a heat peeling layer to be laminated on the paper layer.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to steam-transferable pouches. [Background technology]

[0002] Pouches made of a sheet having multiple layers are known. At least one of the multiple layers may be a paper layer made of paper. Patent Document 1 discloses an example of the configuration of a pouch including a paper layer. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-108024 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the pouches described above, when the contents require heat treatment, a steam passage is provided to release the water vapor generated by heating. However, compared to layers made of resin, which is a material that generally constitutes pouches, paper has a low coefficient of thermal expansion. For this reason, there is a risk that steam will not be able to pass through the portion that constitutes the steam passage. [Means for solving the problem]

[0005] The steam-passing pouch of the present disclosure is a steam-passing pouch that is composed of a sheet having a layered structure including a paper layer and a sealant layer, and includes a pouch body having a storage space, and a protrusion configured to protrude from the pouch body, wherein the protrusion has a steam-passing portion that opens when the pressure in the storage space increases, and in a first specified region including at least a portion of the steam-passing portion, the layered structure of the sheet includes a thermal peeling layer laminated to the paper layer. Effect of the Invention

[0006] According to the steam-passing pouch, suitable steaming is carried out during heating. [Brief description of the drawings]

[0007] [Figure 1] FIG. 2 is a front view of a steam-passing pouch according to an embodiment. [Diagram 2] FIG. 2 is a schematic cross-sectional view showing the layer structure of the sheet constituting the steam-passing pouch of FIG. 1. [Diagram 3] FIG. 4 is a front view showing an example of a position in a steam-permeable pouch where a first predetermined region is provided. [Figure 4] FIG. 4 is a front view showing an example of a position in a steam-permeable pouch where a first predetermined region is provided. [Diagram 5] FIG. 4 is a front view showing an example of a position in a steam-permeable pouch where a first predetermined region is provided. [Figure 6] FIG. 2 is a schematic cross-sectional view showing the state of a portion including a steam passage portion of a steam-passing pouch during heating. [Figure 7] FIG. 2 is a schematic cross-sectional view showing the state of a portion including a steam passage portion of a steam-passing pouch during heating. [Figure 8] FIG. 11 is a schematic cross-sectional view showing the layer structure of a sheet constituting a modified steam-passing pouch. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] (An example of the form that a steam-passing pouch can take) (1) A steam-passing pouch according to the present invention is a steam-passing pouch formed of a sheet having a layered structure including a paper layer and a sealant layer, the pouch body having a storage space, and a protrusion configured to protrude from the pouch body, the protrusion having a steam-passing portion that opens when the pressure in the storage space increases, and in a first predetermined region including at least a portion of the steam-passing portion, the layered structure of the sheet includes a thermal peeling layer laminated to the paper layer. According to the steam-passing pouch, a thermal peeling layer is laminated on the paper layer in the first predetermined region including the steam passage portion. The thermal peeling layer forms a gap between the paper layer and the other layer. This gap allows the steam passage portion to open as the pressure in the storage space increases. Therefore, suitable steam passage is achieved when heated.

[0009] (2) According to one example of the steam-permeable pouch, the sheet includes a first sheet and a second sheet, and the thermal peeling layer is provided on at least one of the first sheet and the second sheet. According to the steam-passing pouch, suitable steaming is carried out during heating.

[0010] (3) According to one example of the steam-permeable pouch, the layer structure includes an intermediate layer provided between the paper layer and the sealant layer, and the thermal peeling layer is provided between the paper layer and the intermediate layer. According to the steam-permeable pouch, since the pouch has an intermediate layer, the usability of the steam-permeable pouch is improved.

[0011] (4) According to one example of the steam-permeable pouch, the steam-permeable portion includes a steam-permeable seal portion and a slit. According to the steam-passing pouch, suitable steaming can be carried out through the slits.

[0012] (5) According to one example of the steam-passing pouch, the pouch further includes a second predetermined region where the thermal peeling layer is not formed. According to the steam-passing pouch, since it includes the second predetermined region where the thermal peeling layer is not formed, the paper layer and the other layers of the layered structure are prevented from being completely peeled off.

[0013] <Embodiment> A steam-permeable pouch 10 according to an embodiment will be described with reference to Figs. 1 to 7. Fig. 1 shows the steam-permeable pouch 10 containing the contents C. The contents C are objects to be heated that generate steam when heated. An example of the contents C is a food product having fluidity. The steam-permeable pouch 10 is configured to be able to be heated with the contents placed therein. The steam-permeable pouch 10 is configured to be able to discharge the steam generated from the contents C. The steam-permeable pouch 10 is configured to suppress the intrusion of air and microorganisms from the outside and to preserve the contents C for a long period of time while maintaining their quality. The steam-permeable pouch 10 can take various forms. Examples of shapes that the steam-permeable pouch 10 can take are a flat bag type, a standing type, a gusset type, and a pillar type. The shape of the steam-permeable pouch 10 illustrated in Fig. 1 is a flat bag type. Hereinafter, the left-right direction of the steam-passing pouch 10 in a front view of the steam-passing pouch 10 may be referred to as the standard width direction XA, and the direction perpendicular to the standard width direction XA may be referred to as the standard height direction XB.

[0014] The steam-permeable pouch 10 includes a pouch body 11 and a protruding portion 12. The pouch body 11 constitutes a major portion of the storage space S. The protruding portion 12 is configured to protrude from the pouch body 11. The protruding portion 12 protrudes in a direction perpendicular to the standard width direction XA and the standard height direction XB.

[0015] The length of the standard width direction XA of the pouch body 11 is preferably determined based on the relationship between the amount of the contents C to be accommodated and the ease of carrying the steam-permeable pouch 10. In one example, the length of the standard width direction XA of the pouch body 11 is in the range of 140 to 170 mm. In one example, the length of the standard width direction XA of the pouch body 11 is 152 mm.

[0016] The length of the pouch body 11 in the standard height direction XB is preferably determined based on the amount of the contents C to be contained and the ease of carrying the steam-permeable pouch 10. According to one example, the length of the pouch body 11 in the standard height direction XB is in the range of 140 to 170 mm. In one example, the length of the pouch body 11 in the standard height direction XB is 158 mm.

[0017] The protruding portion 12 includes a first portion 12A and a second portion 12B. The first portion 12A is configured to be continuous with the storage space S. The second portion 12B is not continuous with the storage space S when the steam-permeable pouch 10 is in a state in which the content C is stored. The second portion 12B may be configured to be continuous with the external space.

[0018] The main elements constituting the steam-permeable pouch 10 are a sheet 20 constituting the pouch body 11 and the protruding portion 12, a sealing portion 40 which forms the storage space S by sealing the sheet 20, and a steam-permeable portion 50 for releasing water vapor generated in the storage space S to the outside.

[0019] In one example, the sheet 20 is composed of a plurality of sheets. The sheet 20 includes a first sheet 21 and a second sheet 22. The first sheet 21 and the second sheet 22 are arranged to face each other, and thus a storage space S is formed between the first sheet 21 and the second sheet 22. The protruding portion 12 is formed by folding at least one of the first sheet 21 and the second sheet 22. In another example, the sheet 20 is composed of a single sheet. The storage space S is formed by folding the single sheet 20. The protruding portion 12 is formed in at least one of the first sheet 21 and the second sheet 22. In this embodiment, the protruding portion 12 is formed in the first sheet 21.

[0020] The sealed portion 40 seals the first sheet 21 and the second sheet 22 so that they do not separate. The sealed portion 40 forms a storage space S to separate the storage space from the outside of the steam-permeable pouch 10. The sealed portion 40 is formed, for example, by heat-sealing a portion of the sealant layer 33 of the first sheet 21 and a portion of the sealant layer 33 of the second sheet 22. The sheet 20 includes the sealed portion 40 and a portion surrounded by the sealed portion 40 (hereinafter referred to as the "inner portion 23").

[0021] The seal portion 40 includes an upper seal portion 41, a lower seal portion 42, a first side seal portion 43, and a second side seal portion 44. The upper seal portion 41 is provided above the inner portion 23 in the standard height direction XB. The lower seal portion 42 is provided below the inner portion 23 in the standard height direction XB. The first side seal portion 43 is provided on either the right or left side of the inner portion 23 in the standard width direction XA. The second side seal portion 44 is provided on the other of the left or right side of the inner portion 23 in the standard width direction XA.

[0022] An inner edge 41A which is the edge of the upper seal portion 41 on the inner portion 23 side, an inner edge 42A which is the edge of the lower seal portion 42 on the inner portion 23 side, an inner edge 43A which is the edge of the first side seal portion 43 on the inner portion 23 side, and an inner edge 44A which is the edge of the second side seal portion 44 on the inner portion 23 side define the inner contour of the inner portion 23. An outer edge 41B which is the edge opposite to the inner edge 41A in the upper seal portion 41, an outer edge 42B which is the edge opposite to the inner edge 42A in the lower seal portion 42, an outer edge 43B which is the edge opposite to the inner edge 43A in the first side seal portion 43, and an outer edge 44B which is the edge opposite to the inner edge 44A in the second side seal portion 44 define the outer contour of the steam-permeable pouch 10.

[0023] The width of each of the sealed portions 41-44 can be selected arbitrarily. The width of each of the sealed portions 41-44 is the length between the inner edge 41A-44A and the outer edge 41B-44B on the normal line of the center line of each of the sealed portions 41-44. The center line of each of the sealed portions 41-44 is an imaginary line segment passing between the inner edge 41A-44A and the outer edge 41B-44B. When the width of each of the sealed portions 41-44 differs from one portion to another, for example, the maximum width or the average width of a plurality of portions of each of the sealed portions 41-44 represents the width of the sealed portion.

[0024] The vapor-passing portion 50 is configured to open as the pressure of the storage space S increases, and to be able to discharge the water vapor in the storage space S to the outside of the steam-passing pouch 10. In a preferred example, the vapor-passing portion 50 is configured to open when the pressure of the storage space S increases to a pressure within a predetermined pressure range. The location in the steam-passing pouch 10 where the vapor-passing portion 50 is provided can be selected arbitrarily. The location in the steam-passing pouch 10 where the vapor-passing portion 50 is provided can be selected arbitrarily. In a first example, the vapor-passing portion 50 is provided in the protruding portion 12. In a second example, the vapor-passing portion 50 is provided in the first side seal portion 43 or the second side seal portion 44. In a third example, the vapor-passing portion 50 is provided in the first side seal portion 43 and the second side seal portion 44. The steam-passing pouch 10 of this embodiment is the first example.

[0025] The steam-passing portion 50 includes a steam-passing seal portion 51 and one or more notches 52. In this embodiment, the steam-passing seal portion 51 includes a first steam-passing seal portion 51A, a second steam-passing seal portion 51B, a third steam-passing seal portion 51C, a fourth steam-passing seal portion 51D, a fifth steam-passing seal portion 51E, a sixth steam-passing seal portion 51F, and a seventh steam-passing seal portion 51G. At least one of the steam-passing seal portions 51A to 51G constituting the steam-passing seal portion 51 is configured to have a lower seal strength than the seal portion 40. Alternatively, at least one of the steam-passing seal portions 51A to 51G constituting the steam-passing seal portion 51 is configured to have a narrower seal width than the seal portion 40. The steam-passing seal portions 51A to 51G partition the first portion 12A and the second portion 12B of the protruding portion 12.

[0026] The multiple cuts 52 are provided in the second portion 12B. The cuts 52 may take various forms. According to a first example, the cuts 52 are holes penetrating the sheet 20. According to a second example, the cuts 52 are holes not penetrating the sheet 20. In the second example, the depth of the cuts 52 is preferably deep enough that the portion in which the cuts 52 are formed breaks when the pressure in the storage space S increases and the steam-permeable seal portion 51 peels off. The cuts 52 may include multiple cuts 52. In this embodiment, the cuts 52 include a first cut 52A, a second cut 52B, and a third cut 52C along the standard width direction XA. At least one of the cuts 52A to 52C may have a different form, or all of them may be the same.

[0027] As shown in Fig. 2, the sheet 20 has a layer structure 30 in which multiple layers are laminated. The layer structure 30 of the sheet 20 may be the same or different between the first sheet 21 and the second sheet 22. In this embodiment, the first sheet 21 and the second sheet 22 have different layer structures 30. The sheet 20 constituting the pouch body 11 and the sheet 20 constituting the protruding portion 12 may have the same layer structure 30 or different layers. The multiple layers constituting the sheet 20 are laminated by, for example, dry lamination.

[0028] The layer structure 30 may have any configuration taking into consideration the strength, heat resistance, water resistance, gas barrier properties, and the like depending on the application of the steam-passing pouch 10. The layer structure 30 includes at least a base material layer 31 and a sealant layer 33. In this embodiment, the layer structure 30 includes the base material layer 31, an intermediate layer 32, and a sealant layer 33.

[0029] The base material layer 31 has a main surface provided along the stacking direction of the layer structure 30. The main surfaces include a first main surface 31A and a second main surface 31B. The material constituting the base material layer 31 is made of any material. In one example, the base material layer 31 is a paper layer made of paper. The paper layer is made of recycled paper or non-recycled paper. Preferably, the paper layer is made of non-recycled paper. The basis weight of the paper constituting the paper layer is, in one example, 30 g / m 2 Preferably, the basis weight of the paper constituting the paper layer is 50 g / m2 That is all. The basis weight of the paper that constitutes the paper layer is, for example, 200 g / m 2 Preferably, the basis weight of the paper constituting the paper layer is less than 120 g / m 2 is less than.

[0030] The intermediate layer 32 has a main surface provided along the stacking direction of the layer structure 30. The main surface includes a first main surface 32A and a second main surface 32B. The material constituting the intermediate layer 32 is composed of any material. In one example, the material constituting the intermediate layer 32 is at least one of polyethylene terephthalate, polypropylene, polyester, and polyamide on which an inorganic thin film such as aluminum oxide or silicon oxide is vapor-deposited. In another example, it is nylon. The intermediate layer 32 may be composed of two or more materials. The thickness of the intermediate layer 32 in the stacking direction is preferably within a range of 5 to 30 μm. The thickness of the intermediate layer 32 in the stacking direction may be changed depending on the material constituting the intermediate layer 32.

[0031] The sealant layer 33 has a main surface provided along the lamination direction of the layer structure 30. The main surfaces of the sealant layer 33 include a first main surface 33A and a second main surface 33B. The material constituting the sealant layer 33 is composed of a thermoplastic resin. The thermoplastic resin is, for example, polyethylene and polypropylene. Preferably, the thermoplastic resin is a block polypropylene in which polyethylene is contained in polypropylene. The thickness of the sealant layer 33 in the lamination direction is preferably within a range of 30 to 80 μm. More preferably, it is within a range of 40 to 60 μm.

[0032] An adhesive layer 34 is formed between each layer. The adhesive layer 34 is formed by any adhesive means. In one example, the adhesive layer 34 is formed by an adhesive such as a two-component curing urethane resin. In another example, the adhesive layer 34 is formed by a resin having heat sealability. The adhesive layer 34 includes a first adhesive layer 34A provided between the base material layer 31 and the intermediate layer 32. The first adhesive layer 34A bonds the second main surface 31B of the base material layer 31 and the first main surface 32A of the intermediate layer 32. The adhesive layer 34 includes a second adhesive layer 34B provided between the intermediate layer 32 and the sealant layer 33. The second adhesive layer 34B bonds the second main surface 32B of the intermediate layer 32 and the first main surface 33A of the sealant layer 33.

[0033] The layer structure 30 may include an ink layer. The ink layer displays characters or figures to display information about the contents C of the steam-permeable pouch 10. If the contents C are food, the information about the contents C includes information about the appropriate cooking method and nutritional value of the food. The ink layer is provided on the first main surface 31A of the base layer 31. The ink layer is appropriately selected from known printing methods in consideration of the printability of the base layer 31, design such as color tone, adhesion to other layers, and safety as the steam-permeable pouch 10. Examples of printing methods include gravure printing, offset printing, gravure offset printing, flexographic printing, and inkjet printing. An overprint varnish may be further printed on the ink layer.

[0034] The steam-permeable pouch 10 further includes a thermal peeling layer 60 for facilitating peeling of the components included in the layer structure 30 when the steam-permeable pouch 10 is opened. The thermal peeling layer 60 is provided between the layer including the paper layer and the adhesive layer 34. The thermal peeling layer 60 has the effect of weakening the adhesion between the layer including the paper layer and the adhesive layer 34 when heated.

[0035] In one example, the thermal peeling layer 60 includes a varnish. The varnish includes a first varnish printed on the surface of the paper layer and a second varnish printed on the first varnish. The first varnish is used to seal the paper layer. The second varnish is used to facilitate peeling between the layer including the paper layer and the adhesive layer 34.

[0036] The peel strength of the thermal peeling layer 60 was measured with reference to JIS Z1707:2019. The preferred peel strength of the thermal peeling layer 60 is 1N / 15mm or more at room temperature when the tensile speed is 300mm / min. The preferred peel strength of the thermal peeling layer 60 is less than 1N / 15mm at the heating temperature when the tensile speed is 300mm / min. The room temperature is, for example, 25°C. The heating temperature is, for example, 80°C.

[0037] The steam-permeable pouch 10 further includes an easy-open portion 70 that makes it easy to open the steam-permeable pouch 10 when opening it. The easy-open portion 70 includes a tear line 71 and a notch 72. The tear line 71 is provided in at least a portion between the first side seal portion 43 and the second side seal portion 44 along the standard width direction XA. In this embodiment, the tear line 71 is formed linearly. The tear line 71 is composed of a plurality of perforations. Preferably, a plurality of perforations are provided in the standard height direction XB.

[0038] The notch 72 is formed such that a tip 72A of the notch 72 is located on the tear line 71 or on an imaginary line extending from the tear line 71. The notch 72 is formed in at least one of the first side seal portion 43 and the second side seal portion 44. FIG. 1 shows an example in which the notch 72 is formed in the first side seal portion 43.

[0039] The first predetermined region R1 where the thermal peeling layer 60 is provided will be described. The first predetermined region R1 includes at least the protruding portion 12. The first predetermined region R1 includes at least a part of the steam-passing seal portion 51 of the steam-passing portion 50 provided in the protruding portion 12.

[0040] The first predetermined region R1 indicates a portion where dark dots are formed. The first predetermined region R1 includes at least a portion of the steam-passing seal portion 51 and at least one of the notches 52. In the example shown in Fig. 3, the first predetermined region R1 includes the entire fourth steam-passing seal portion 51D and portions of the third steam-passing seal portion 51C and the fifth steam-passing seal portion 51E. The first predetermined region R1 includes the second notch 52B.

[0041] In the example shown in Fig. 4, the first predetermined region R1 includes all of the first through steam seal portion 51A to the seventh through steam seal portion 51G. The first predetermined region R1 includes all of the first cut 52A, the second cut 52B, and the third cut 52C. The first predetermined region R1 is provided in the entire sheet 20 constituting the protruding portion 12. In the example shown in Fig. 5, in addition to the locations shown in Fig. 3, the first predetermined region R1 is further provided in at least a portion of the pouch body 11.

[0042] 3 to 5, the steam-permeable pouch 10 includes a second predetermined region R2 where the thermal peeling layer 60 is not formed. The second predetermined region R2 indicates a portion where no dark dots are formed. Since the thermal peeling layer 60 is not formed in the second predetermined region R2, the layer structure 30 is unlikely to peel off when heated.

[0043] An example of a method for filling the steam-permeable pouch 10 with the contents C will be described. Before filling, the steam-permeable pouch 10 is in a state where one of the sealed portions 41 to 44 is not sealed. In one example, the upper sealed portion 41 is not formed. An opening (not shown) is formed in the portion where the upper sealed portion 41 is to be formed. The contents C are filled through the opening, and the portion is heat-sealed to form the upper sealed portion 41. In this way, the contents C are preserved in the steam-permeable pouch 10.

[0044] The operation of the steam-passing pouch 10 of the embodiment will be described with reference to FIG. 1, FIG. 6, and FIG. 7. The steam-passing pouch 10 is heated by a heating means for heating the contents C. An example of the heating means is a microwave oven. When the steam-passing pouch 10 is heated, water vapor is generated from the contents C. In the steam-passing pouch 10, since the storage space S is closed by the seal portion 40, the pressure in the storage space S increases with the generation of water vapor. With the increase in pressure, the pressure in the vicinity of the steam-passing portion 50 increases. As shown in FIG. 6, a thermal peeling layer 60 is formed in the first predetermined region R1 including the steam-passing seal portion 51 of the steam-passing portion 50. When the steam-passing pouch 10 is heated, the thermal peeling layer 60 is peeled off, forming a gap G between the base layer 31 and the intermediate layer 32. In this embodiment, since the thermal peeling layer 60 is formed on the first sheet 21 constituting the protruding portion 12, a gap G1 is formed between the base layer 31 and the intermediate layer 32 of the first sheet 21. The gap G1 is formed because the sealant layers 33 of the first sheet 21 constituting the steam-permeable seal portion 51 expand due to the pressure of the storage space S and peel off. The storage space S is connected to the outside through the cut 52 by peeling off the steam-permeable seal portion 51 of the steam-permeable portion 50. The increase in pressure of the storage space S is suppressed by escaping the water vapor generated in the storage space S from the steam-permeable portion 50. After heating of the steam-permeable pouch 10 is completed, the user opens the steam-permeable pouch 10 along the cut line 71 of the easy-open portion 70.

[0045] The steam-permeable pouch 10 of the embodiment further provides the following effects. (1) The basis weight of the paper that constitutes the paper layer is 30 g / m 2 For this reason, the strength of the steam-passing pouch 10 can be suitably maintained even when the amount of resin material constituting the base layer 31 and the intermediate layer 32 is small. 2 Since the thickness is less than 1 mm, various costs involved in producing the steam-passing pouch 10 are reduced.

[0046] (2) The steam-passing pouch 10 is formed so that the first predetermined region R1 includes a portion other than the steam-passing portion 50. In the steam-passing pouch 10 after steaming, an air layer is formed between the base layer 31 including a paper layer and the intermediate layer 32 in a portion corresponding to the first predetermined region R1. This makes it possible to improve the heat insulation of the steam-passing pouch 10 after steaming.

[0047] (Modification) The description of the embodiments is merely an example of possible forms of the steam-passable pouch according to the present invention, and is not intended to limit the forms. In addition to the embodiments, the steam-passable pouch according to the present invention may take the form of, for example, a modified embodiment of the embodiment shown below, or a combination of at least two mutually compatible modified embodiments.

[0048] The layer structure 30 may be modified as desired. In one example, the intermediate layer 32 is made of a material that can be thermally bonded to the sealant layer 33. The intermediate layer 32 shown in FIG. 8 is made of a polyethylene resin that can be thermally welded to the material that constitutes the sealant layer 33. This makes it possible to omit the configuration of the second adhesive layer 34B. The polyethylene resin has a density of, for example, 0.90 to 0.96 g / m 3 Preferably, the polyethylene resin has a density of 0.91 to 0.93 g / m 3 When made of such a polyethylene resin, the thickness in the lamination direction falls within the range of 5 to 30 μm, for example.

[0049] In the modified steam-passing pouch 10, the intermediate layer 32 is made of a paper layer. In this case, a thermal peeling layer 60 is formed on at least the second adhesive layer 34B. The base material layer 31 is made of the material that makes up the intermediate layer 32 in the embodiment. It is at least one of polyethylene terephthalate, polypropylene, polyester, and polyamide on which an inorganic thin film such as aluminum oxide or silicon oxide is vapor-deposited. Another example is nylon.

[0050] The thermal peeling layer 60 may be composed of a material other than the varnish 61. In one example, the thermal peeling layer 60 is composed of an adhesive weaker than the adhesive constituting the adhesive layer 34. Preferably, the thermal peeling layer 60 has a thermal peeling effect in which the adhesiveness is weakened by heating the steam-passing pouch 10.

[0051] At least one of the base layer 31 and the intermediate layer 32 may be composed of a paper layer and a layer composed of a material other than paper. The material other than paper is at least one of polyethylene terephthalate, polypropylene, polyester, and polyamide on which an inorganic thin film such as aluminum oxide or silicon oxide is vapor-deposited. Another example is nylon. In this case, the paper layer of the base layer 31 is formed on the second main surface 31B side. A thermal peeling layer 60 is provided between the paper layer on the second main surface 31B side and the first adhesive layer 34A. [Explanation of symbols]

[0052] 10...Steam-through pouch 11…Pouch body 12...Protruding part 20…sheets 21…1st sheet 22…Second seat 30…layer structure 31...Base material layer 32. Middle class 33…Sealant layer 40…Seal part 50...Steaming section 60…Thermal peeling layer S... Storage space R1...first predetermined area R2…Second predetermined area

Claims

1. A pouch body having a storage space and configured with a sheet having a layer structure including a paper layer and a sealant layer; A steam-passing pouch including a protruding portion configured to protrude from the pouch body, The protruding portion has a vapor passage portion that opens when the pressure in the storage space increases, In a first predetermined region including at least a portion of the steam passage portion, the layer structure of the sheet includes a thermal peeling layer laminated on the paper layer, The sheet includes a first sheet and a second sheet that form the storage space, the steam-passing portion includes a steam-passing seal portion in which the sealant layer of the first sheet and the sealant layer of the second sheet are bonded to each other, The steam-permeable pouch is configured such that a gap is formed between the paper layer and the sealant layer of the first sheet or the sealant layer of the second sheet by peeling off the thermal peeling layer, and the storage space is connected to the outside by peeling off the steam-permeable seal portion. Steam-permeable pouch.

2. A pouch body having a storage space and configured with a sheet having a layer structure including a paper layer and a sealant layer; A steam-passing pouch including a protruding portion configured to protrude from the pouch body, The protruding portion has a vapor passage portion that opens when the pressure in the storage space increases, In a first predetermined region including at least a portion of the steam passage portion, the layer structure of the sheet includes a thermal peeling layer laminated on the paper layer, The layer structure includes an intermediate layer provided between the paper layer and the sealant layer, The thermal release layer is provided between the paper layer and the intermediate layer. Steam-permeable pouch.

3. The sheet includes a first sheet and a second sheet, The thermal peeling layer is provided on at least one of the first sheet and the second sheet. The steam-transferable pouch according to claim 2.

4. The steam passage portion includes a steam passage seal portion and a notch. The steam-transferable pouch according to claim 2 or 3.

5. The thermal release layer may further include a second predetermined area where the thermal release layer is not formed. The steam-passing pouch according to any one of claims 1 to 4.

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