JP7647136B2 - Steam-through pouch - Google Patents

Description

This disclosure relates to a steam-permeable pouch.

Pouches made of a sheet having multiple layers are known. At least one of the multiple layers may have a paper layer made of paper. Patent Document 1 discloses an example of the configuration of a pouch including a paper layer.

JP 2016-108024 A

In pouches like the one above, if the contents require heat treatment, a steam passage is provided to release the water vapor that is generated when heated. However, compared to layers made of resin, which is the material that makes up typical 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 part that makes up the steam passage.

The steam-permeable pouch of the present disclosure is a steam-permeable pouch that is composed of a sheet having a layer structure including a paper layer and a sealant layer, and includes a pouch body having a storage space and a bottom that supports the pouch body, and the pouch body has a steam-permeable portion that opens when the pressure in the storage space increases, and in a first predetermined region that includes the steam-permeable portion, the layer structure includes a paper layer and a heat-peeling layer laminated to the paper layer.

The steam-passing pouch described above allows for optimal steaming during heating.

FIG. 2 is a front view of a steam-passing pouch according to an embodiment. FIG. 2 is a schematic cross-sectional view showing the layer structure of the sheet constituting the steam-passing pouch of FIG. 1 . FIG. 4 is a front view showing an example of a position in a steam-passing pouch where a first predetermined region is provided. FIG. 4 is a front view showing an example of a position in a steam-passing pouch where a first predetermined region is provided. FIG. 4 is a front view showing an example of a position in a steam-passing pouch where a first predetermined region is provided. 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. 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. FIG. 11 is a schematic cross-sectional view showing the layer structure of a sheet constituting a modified steam-passing pouch.

(An example of a form that a steam-passing pouch can take)
(1) A steam-passing pouch according to the present invention is a steam-passing pouch formed from a sheet having a layered structure including a paper layer and a sealant layer, the pouch body having a storage space, and a bottom supporting the pouch body, the pouch body having a steam-passing portion that opens when the pressure in the storage space increases, and in a first specified region including the steam-passing portion, the layered structure 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.

(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.

(3) According to one example of the steam-permeable pouch, the layer structure includes the sealant layer and 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 intermediate layer is provided, the usability of the steam-permeable pouch is improved.

(4) According to one example of the steam-passing pouch, the steam-passing portion includes a steam-passing sealed portion and an unsealed portion.
According to the steam-passing pouch, suitable steam passage is carried out through the unsealed portion.

(5) According to one example of the steam-passing pouch, the pouch body includes a second predetermined region in which the thermal peeling layer is not formed.
According to the above steam-passing pouch, since it includes the second predetermined region where the thermal peeling layer is not formed, complete peeling of the paper layer and the other layers of the layered structure is suppressed.

<Embodiment>
A steam-permeable pouch 10 according to an embodiment will be described with reference to FIGS. 1 to 7. FIG. 1 shows a steam-permeable pouch 10 containing a content C. The content C is a heated object that generates steam when heated. An example of the content C is a food having fluidity. The steam-permeable pouch 10 is configured to be heated with the content placed therein. The steam-permeable pouch 10 is configured to be capable of discharging steam generated from the content C. The steam-permeable pouch 10 is configured to suppress the intrusion of air and microorganisms from the outside and to preserve the quality of the content C for a long period of time. The steam-permeable pouch 10 can take various forms. Examples of shapes that the steam-permeable pouch 10 can take include 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 standing type. Hereinafter, the left-right direction of the steam-passing pouch 10 when viewed from the front 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.

The steam-permeable pouch 10 includes a pouch body 11 and a bottom 12. The pouch body 11 constitutes the main portion of the storage space S. The bottom 12 is configured to protrude from the pouch body 11. The bottom 12 is disposed below the pouch body 11 in the standard height direction XB, and supports the pouch body 11.

The length of the standard width direction XA of the pouch body 11 and bottom portion 12 is preferably determined based on the amount of contents C to be contained 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 and bottom portion 12 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 and bottom portion 12 is 152 mm.

The length of the standard height direction XB of the pouch body 11 and the bottom portion 12 is preferably determined based on the relationship between the amount of contents C to be contained and the ease of carrying the steam-passing pouch 10. According to one example, the length of the standard height direction XB of the pouch body 11 and the bottom portion 12 is in the range of 140 to 170 mm. In one example, the length of the standard height direction XB of the pouch body 11 and the bottom portion 12 is 158 mm. The length of the standard height direction XB of the pouch body 11 is preferably longer than the length of the standard height direction XB of the bottom portion 12. In one example, the length of the standard height direction XB of the pouch body 11 is 113 mm. In one example, the length of the standard height direction XB of the bottom portion 12 is 45 mm.

The main elements that make up the steam-permeable pouch 10 are the sheet 20 that constitutes the pouch body 11 and bottom 12, the sealing section 40 that forms the storage space S by sealing the sheet 20, and the steam-permeable section 50 that releases water vapor generated in the storage space S to the outside.

In one example, the sheet 20 is made up of multiple 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 facing each other, so that a storage space S is formed between the first sheet 21 and the second sheet 22. In another example, the sheet 20 is made up of a single sheet. The storage space S is formed by folding the single sheet 20.

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").

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.

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

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 to 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 varies from one portion to another, for example, the maximum width or the average width of multiple portions of each of the sealed portions 41-44 represents the width of that sealed portion.

The vapor passage section 50 is configured to open as the pressure in 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 passage section 50 is configured to open when the pressure in the storage space S increases to a pressure within a predetermined pressure range. The location in the steam-passing pouch 10 where the vapor passage section 50 is provided can be selected arbitrarily. In a first example, the vapor passage section 50 is provided in the first side seal section 43. In a second example, the vapor passage section 50 is provided in the second side seal section 44. In a third example, the vapor passage section 50 is provided in both the first side seal section 43 and the second side seal section 44. The steam-passing pouch 10 of this embodiment shows the vapor passage section 50 of the second example.

The steam-passing portion 50 includes a steam-passing seal portion 51 and an unsealed portion 52. In one example, the steam-passing seal portion 51 is configured to have a lower seal strength than the first side seal portion 43 and the second side seal portion 44. In another example, the steam-passing seal portion 51 is configured to have a narrower seal width than the first side seal portion 43 and the second side seal portion 44. Preferably, the steam-passing seal portion 51 is configured to protrude toward the storage space S. The seal of the steam-passing seal portion 51 peels off as the pressure in the storage space S increases, connecting the storage space S and the unsealed portion 52.

As shown in FIG. 2, the sheet 20 has a layer structure 30 in which multiple layers are stacked. 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 the same layer structure 30. The sheet 20 constituting the pouch body 11 and the sheet 20 constituting the bottom 12 may each have the same layer structure 30 or different layers. The multiple layers constituting the sheet 20 are stacked, for example, by dry lamination.

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-permeable pouch 10. The layer structure 30 includes at least a base layer 31 and a sealant layer 33. In this embodiment, the layer structure 30 includes a base layer 31, an intermediate layer 32, and a sealant layer 33.

The base material layer 31 has a main surface provided along the stacking direction of the layer structure 30. The main surface includes a first main surface 31A and a second main surface 31B. The material constituting the base material layer 31 is composed of any material. In one example, the base material layer 31 is a paper layer composed of paper. The paper layer is composed of recycled paper or non-recycled paper. Preferably, the paper layer is composed of non-recycled paper. In one example, the basis weight of the paper constituting the paper layer is 30 g/m ² or more. Preferably, the basis weight of the paper constituting the paper layer is 50 g/m ² or more. In one example, the basis weight of the paper constituting the paper layer is less than 200 g/m ^2. Preferably, the basis weight of the paper constituting the paper layer is less than 120 g/m ² .

The intermediate layer 32 has a main surface provided along the stacking direction of the layer structure 30. The main surfaces include 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. Preferably, the thickness of the intermediate layer 32 in the stacking direction is 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.

The sealant layer 33 has a main surface that is provided along the stacking 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 that constitutes 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 stacking direction is preferably within the range of 30 to 80 μm. More preferably, it is within the range of 40 to 60 μm.

An adhesive layer 34 is formed between each layer. The adhesive layer 34 is made of any adhesive means. In one example, the adhesive layer 34 is made of an adhesive such as a two-component curing urethane resin. In another example, the adhesive layer 34 is made of 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.

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, taking into consideration 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.

The steam-permeable pouch 10 further includes a thermal peeling layer 60 for making it easier to peel off 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.

In one example, the thermal peeling layer 60 includes a varnish. The varnish includes a first varnish that is printed on the surface of the paper layer and a second varnish that is 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.

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 1 N/15 mm or more at room temperature when the tensile speed is 300 mm/min. The preferred peel strength of the thermal peeling layer 60 is less than 1 N/15 mm at the heating temperature when the tensile speed is 300 mm/min. The room temperature is, for example, 25°C. The heating temperature is, for example, 80°C.

The steam-permeable pouch 10 further includes an easy-to-open portion 70 that makes it easy to open the steam-permeable pouch 10. The easy-to-open portion 70 includes a perforation line 71 and a notch 72. The perforation 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 perforation line 71 is formed in a straight line. The perforation line 71 is composed of multiple perforations. Preferably, multiple perforations are provided in the standard height direction XB.

The notch 72 is formed so that the tip 72A of the notch 72 is located on the cut line 71 or on an imaginary line extending from the cut 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.

The first predetermined region R1 in which the thermal peeling layer 60 is provided will be described. In the first predetermined region R1, the thermal peeling layer 60 is provided on at least one of the first sheet 21 and the second sheet 22. Preferably, the thermal peeling layer 60 is provided on both the first sheet 21 and the second sheet 22. The range of the thermal peeling layer 60 provided on the first sheet 21 may be different from the range of the thermal peeling layer 60 provided on the second sheet 22. The first predetermined region R1 includes at least a portion of the steam-passing seal portion 51 of the steam-passing portion 50 in a front view of the steam-passing pouch 10. Preferably, the first predetermined region R1 includes the entire steam-passing portion 50.

In the example shown in FIG. 3, the first predetermined region R1 indicates the portion where dark dots are formed. The first predetermined region R1 is provided in a portion of the standard height direction XB of the second side seal portion 44 including the vapor passage portion 50.

In the example shown in FIG. 4, the first predetermined region R1 is provided over the entire standard height direction XB of the second side seal portion 44, including the steam passage portion 50. Furthermore, the first predetermined region R1 is provided over a portion of the standard width direction XA of the upper seal portion 41 and the lower seal portion 42.

In the example shown in FIG. 5, the first predetermined region R1 is provided over the entire standard height direction XB of the first side seal portion 43. The first predetermined region R1 is provided over the entire standard height direction XB of the second side seal portion 44 including the steam passage portion 50. Furthermore, the first predetermined region R1 is provided in a portion of the standard width direction XA of the upper seal portion 41 and the lower seal portion 42.

As shown in Figures 3 to 5, the steam-permeable pouch 10 includes a second predetermined region R2 in which the thermal peeling layer 60 is not formed. The second predetermined region R2 indicates a portion in which no dark dots are formed. In the second predetermined region R2, the thermal peeling layer 60 is not formed, so the layer structure 30 is less likely to peel off when heated.

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 has one of the sealed sections 41 to 44 unsealed. In one example, the upper sealed section 41 is not formed. An opening (not shown) is formed in the area where the upper sealed section 41 will be formed. The contents C are filled through the opening, and the area is heat-sealed to form the upper sealed section 41. This allows the contents C to be preserved in the steam-permeable pouch 10.

1, 6 and 7, the operation of the steam-passing pouch 10 of the embodiment will be described. 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 near 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 both the first sheet 21 and the second sheet 22, a gap G1 is formed between the base layer 31 and the intermediate layer 32 of the first sheet 21, and a gap G2 is formed between the base layer 31 and the intermediate layer 32 of the second sheet 22. By forming the gap G1 and the gap G2, the sealant layer 33 of the first sheet 21 and the sealant layer 33 of the second sheet 22 constituting the steam-passing seal portion 51 are expanded by the pressure of the storage space S and a gap G is formed for peeling off. By peeling off the steam-passing seal portion 51 of the steam-passing portion 50, the storage space S and the outside are connected through the unsealed portion 52. 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-passing portion 50. After heating of the steam-passing pouch 10 is completed, the user opens the steam-passing pouch 10 along the cut line 71 of the easy-to-open portion 70.

According to the steam-permeable pouch 10 of the embodiment, the following effects can be further obtained.
(1) Since the basis weight of the paper constituting the paper layer is 30 g/ ^m2 or more, the strength of the steam-passing pouch 10 can be suitably maintained even when the amount of resin material constituting the base material layer 31 and the intermediate layer 32 is small. Since the basis weight of the paper constituting the paper layer is less than 200 g/ ^m2 , various costs involved in manufacturing the steam-passing pouch 10 are reduced.

(2) The steam-passing pouch 10 is formed so that the first predetermined region R1 includes the portion other than the steam-passing portion 50. After steaming, the steam-passing pouch 10 has an air layer formed between the base layer 31, which includes a paper layer, and the intermediate layer 32 in the portion corresponding to the first predetermined region R1. This improves the thermal insulation of the steam-passing pouch 10 after steaming.

(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 non-contradictory modified embodiments.

The layer structure 30 may be changed as desired. In one example, the intermediate layer 32 is made of a material capable of thermally bonding to the sealant layer 33. The intermediate layer 32 shown in FIG. 8 is made of a polyethylene resin capable of thermally welding to the material constituting the sealant layer 33. For this reason, the configuration of the second adhesive layer 34B can be omitted. The polyethylene resin has a density in the range of 0.90 to 0.96 g/ ^m3 , for example. Preferably, the polyethylene resin has a density in the range of 0.91 to 0.93 g/ ^m3 . When made of such a polyethylene resin, the thickness in the stacking direction is in the range of 5 to 30 μm, for example.

- In the modified steam-permeable pouch 10, the intermediate layer 32 is composed 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 composed of the material that constitutes 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.

The thermal peeling layer 60 may be composed of something other than the varnish 61. In one example, the thermal peeling layer 60 is composed of an adhesive that is weaker than the adhesive that constitutes the adhesive layer 34. Preferably, the thermal peeling layer 60 has a thermal peeling effect that weakens the adhesiveness when the steam-permeable pouch 10 is heated.

- The sheet 20 constituting the pouch body 11 and the sheet 20 constituting the bottom 12 may be configured to have different configurations. The sheet 20 constituting the bottom may be configured as a gusset sheet.

At least one of the base layer 31 or 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.

REFERENCE SIGNS LIST 10: steam-permeable pouch 11: pouch body 12: bottom 20: sheet 21: first sheet 22: second sheet 30: layer structure 31: base material layer 32: intermediate layer 33: sealant layer 40: seal portion 50: steam-permeable portion 60: heat peeling layer S: storage space R1: first predetermined region R2: second predetermined region

Claims (5)

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 comprising:
The pouch body includes a steam passage portion that opens when the pressure in the storage space increases,
In a first predetermined region including the steam passage portion, the layer structure 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. 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 comprising:
The pouch body includes a steam passage portion that opens when the pressure in the storage space increases,
In a first predetermined region including the steam passage portion, the layer structure includes a thermal peeling layer laminated on the paper layer,
the layer structure includes the sealant layer and 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. 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 . The steam passage portion includes a steam passage sealed portion and an unsealed portion.
The steam-transferable pouch according to claim 2 or 3 . The steam-passing pouch according to any one of claims 1 to 4, wherein the pouch body includes a second predetermined area in which the thermal peeling layer is not formed.