JP2022152767A - Steam-permeable type pouch - Google Patents

Abstract

To provide a steam-permeable type pouch for preventing a paper sheet from being peeled.SOLUTION: A steam-permeable type pouch 10 forms a storage space S in which a stored article C is stored by a sheet 20 including a layer structure obtained by laminating a plurality of layers, and a seal part 40 for sealing the sheet 20. The layer structure comprises a paper layer. An easily peelable layer is formed on at least part of the paper sheet.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to pervaporized pouches.

Pouches are known which are composed of sheets having a plurality of layers. At least one of the layers may be provided with a paper layer made of paper. Patent Literature 1 discloses an example of a pouch configuration including a paper layer.

JP 2016-108024 A

In the pouch as described above, when the paper layer and other layers are not properly separated from each other when the pouch is opened, there is a risk of paper peeling occurring in the paper layer. The part where the paper is peeled off may deteriorate the design and may become dirty due to contact with the contents of the pouch.

The vapour-type pouch of the present disclosure is a vapour-type pouch in which a storage space for storing a content is formed by a sheet including a layered structure in which a plurality of layers are laminated, and a sealing portion that seals the sheet. , the layer structure includes a paper layer, and an easily peelable layer is formed on at least a portion of the paper layer.

In the steamable pouch, the paper layer forming the steamable pouch is less likely to peel off when the pouch is opened.

FIG. 2 is a front view of the pervaporization pouch of the embodiment; FIG. 2 is a schematic cross-sectional view showing the layer structure of the sheet that constitutes the pervaporization pouch. The schematic front view which shows the structure of an easy-to-open part.

(An example of a form that a steamable pouch can take)
(1) A vapour-type pouch according to the present disclosure is a vapour-type pouch in which a storage space for storing a content is formed by a sheet including a layered structure in which a plurality of layers are laminated, and a sealing portion that seals the sheet. The layer structure includes a paper layer, and an easily peelable layer is formed on at least a portion of the paper layer.
In a steamable pouch containing a paper layer, there is a risk that the paper will peel off when opened. Paper peeling is a phenomenon in which paper layers are separated. Paper peeling includes a state in which the paper layers are fluffed due to peeling between the paper layers and a state in which the peeled paper layers are gouged. Peeling between the paper layers occurs when the paper layer and other layers constituting the layer structure do not separate and a force associated with opening acts. According to this vapor-permeable pouch, since the easily peelable layer is provided, the paper layer and other layers constituting the layer structure can be easily peeled off, for example, when the pouch is opened. Therefore, paper peeling is less likely to occur.

(2) According to one example of the vapor-permeable pouch, the sheet includes a first sheet and a second sheet, and the easily peelable layer is formed on at least one of the first sheet and the second sheet.
According to this vapour-passing type pouch, since the easily peelable layer is formed on at least one of the first sheet and the second sheet, for example, peeling of the paper is less likely to occur when the pouch is opened.

(3) According to one example of the steamable pouch, the easily peelable layer contains varnish.
According to this steaming type pouch, for example, peeling of the paper is less likely to occur when the pouch is opened.

(4) According to one example of the steamable pouch, the sheet further includes an easy-opening portion, and at least a portion of the easy-opening portion coincides with the easy-peeling layer in the stacking direction of the plurality of layers.
According to this vapour-type pouch, the vapour-type pouch can be easily opened via the easy-to-open portion. In addition, when the package is opened through the easy-to-open portion, the paper is less likely to peel off.

(5) According to one example of the vapor-vapor-type pouch, it further includes a vapor-vapor part that releases the gas in the accommodation space.
According to this vapour-type pouch, water vapor generated in the housing space during heating of the vapour-type pouch can be released to the outside.

(6) According to one example of the pervaporization pouch, the contents are accommodated in the accommodation space.
According to this vapour-type pouch, the contents are favorably preserved.

<Embodiment>
A vapour-type pouch 10 according to an embodiment will be described with reference to FIGS. 1 to 3. FIG. FIG. 1 shows a steamable pouch 10 containing a content C. FIG. The content C is an object to be heated that generates steam when heated. An example of the content C is fluid food. Vapor-type pouch 10 is configured to be heatable while containing contents. Vapor-type pouch 10 is configured so that steam generated from content C can be discharged. Vapor-type pouch 10 is configured to prevent intrusion of air and microorganisms from the outside, and to allow long-term storage while maintaining the quality of content C. As shown in FIG. Vapor-type pouch 10 may take various forms. Examples of shapes that the steamable pouch 10 can take are a flat bag type, a standing type, a gusset type, and a pillar type. The shape of the pervaporization pouch 10 illustrated in FIG. 1 is a standing type. Hereinafter, the left-right direction of the vapour-producing pouch 10 when viewed from the front may be referred to as a standard width direction XA, and the direction orthogonal to the standard width direction XA may be referred to as a standard height direction XB.

Vapor-type pouch 10 includes pouch body 11 and bottom portion 12 . The pouch body 11 constitutes a main part of the accommodation space S. The bottom portion 12 is configured to protrude from the pouch body 11 . The bottom portion 12 is arranged below the pouch body 11 in the standard height direction XB and supports the pouch body 11 .

The lengths of the pouch body 11 and the bottom portion 12 in the standard width direction XA are preferably determined based on the relationship between the amount of the content C to be accommodated and the portability of the vapor-steaming pouch 10 . In one example, the length of the standard width direction XA of the pouch body 11 and bottom 12 is included in the range of 140-170 mm. In one example, the standard width direction XA length of the pouch body 11 and bottom portion 12 is 152 mm.

The length of the pouch body 11 and the bottom portion 12 in the standard height direction XB is preferably determined from the relationship between the amount of the content C to be accommodated and the portability of the vapour-type pouch 10 . According to one example, the height of the pouch body 11 and the bottom 12 is comprised in the range of 140-170mm. In one example, the length of the pouch body 11 and bottom 12 in the standard height direction XB is 158 mm. The length of the pouch body 11 in the standard height direction XB is preferably longer than the length of the bottom part 12 in the standard height direction XB. In one example, the length of the pouch body 11 in the standard height direction XB is 113 mm. In one example, the length of the standard height direction XB of the bottom part 12 is 45 mm.

The vapor-permeable pouch 10 includes a sheet 20 that forms the pouch body 11 and the bottom portion 12, a sealing portion 40 that seals the sheet 20 to form an accommodation space S, and releases water vapor generated in the accommodation space S to the outside. It includes a vapor passage section 50 for

In one example, the seat 20 is composed of a plurality of sheets. Sheet 20 includes a first sheet 21 and a second sheet 22 . A housing space S is formed between the first sheet 21 and the second sheet 22 by providing the first sheet 21 and the second sheet 22 so as to face each other. In another example, the sheet 20 consists of one sheet. A storage space S is formed by folding one sheet 20 .

The seal portion 40 seals the first sheet 21 and the second sheet 22 so that they are not separated. The sealing portion 40 forms an accommodation space S to distinguish the vapour-type pouch 10 from the outside. The seal 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 seat 20 includes a seal portion 40 and a portion surrounded by the seal portion 40 (hereinafter “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 side or the 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 side and the right side of the inner portion 23 in the standard width direction XA.

An inner edge 41A that is the edge of the upper seal portion 41 on the inner portion 23 side, an inner edge 42A that is the edge of the lower seal portion 42 on the inner portion 23 side, and an edge of the first side seal portion 43 on the inner portion 23 side. An inner edge 43A 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. As shown in FIG. An outer edge 41B opposite to the inner edge 41A in the upper seal portion 41, an outer edge 42B opposite to the inner edge 42A in the lower seal portion 42, and an opposite edge to the inner edge 43A in the first side seal portion 43. and an outer edge 44B opposite to the inner edge 44A of the second side seal portion 44 define the outline of the vapor-sealing pouch 10. As shown in FIG.

The width of each seal portion 41 to 44 can be arbitrarily selected. The width of each seal portion 41-44 is the length between the inner edge 41A-44A and the outer edge 41B-44B normal to the center line of each seal portion 41-44. The center line of each seal portion 41-44 is an imaginary line segment passing between the inner edges 41A-44A and the outer edges 41B-44B. When the width of each seal portion 41 to 44 differs for each portion, for example, the maximum width or the average width of a plurality of portions in each seal portion 41 to 44 represents the width of the seal portion.

The vapor passage part 50 is configured to be opened as the pressure in the storage space S rises, so that the steam in the storage space S can be discharged to the outside of the permeable pouch 10 . In a preferred example, the ventilation part 50 is configured to open when the pressure in the accommodation space S rises to a pressure within a predetermined pressure range.

The position of the vaporizing portion 50 in the vaporizable pouch 10 can be arbitrarily selected. In the first example, the vapor passage portion 50 is provided in the first side seal portion 43 . In a second example, the vapor passage portion 50 is provided in the second side seal portion 44 . In the third example, vapor passage portions 50 are provided on both the first side seal portion 43 and the second side seal portion 44 . The vapor-vaporizing pouch 10 of the present embodiment shows the vapor-vaporizing part 50 of the second example.

In one example, the vaporizing portion 50 is provided between the upper seal portion 41 and the upper end of the contents C with respect to the standard height direction XB. Vapor-permeable portion 50 includes a vapor-permeable sealed portion 51 and an unsealed portion 52 . In one example, the permeable 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 permeable 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 permeable seal portion 51 is configured to protrude toward the accommodation space S. As shown in FIG. When the seal of the vapor-permeable seal portion 51 is peeled off as the pressure in the accommodation space S rises, the accommodation space S and the unsealed portion 52 are connected.

As shown in FIG. 2, the sheet 20 comprises 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 a similar layer structure 30 . The sheet 20 forming the pouch body 11 and the sheet 20 forming the bottom portion 12 may have the same layer structure 30 or may have different layers. A plurality of layers forming the sheet 20 are laminated by dry lamination, for example.

The layer structure 30 may have any configuration in consideration of strength, heat resistance, water resistance, gas barrier properties, etc., depending on the use of the vapor-permeable pouch 10 . In this embodiment, the layered 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 major surfaces include a first major surface 31A and a second major surface 31B. A material constituting the base material layer 31 is composed of an arbitrary material. In one example, the base material layer 31 is a paper layer made of paper. The paper layer is composed of recycled or non-recycled paper. Preferably, the paper layer is composed of non-recycled paper. The basis weight of the paper constituting the paper layer is, for example, 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 forming the paper layer is less than 200 g/m ² . Preferably, the basis weight of the paper making up 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 major surfaces include a first major surface 32A and a second major surface 32B. The material forming the intermediate layer 32 is an arbitrary material. In one example, the material composing the intermediate layer 32 is at least one of polyethylene terephthalate, polypropylene, polyester, and polyamide deposited with an inorganic thin film such as aluminum oxide or silicon oxide. Another example is nylon.

The sealant layer 33 has a main surface provided along the stacking direction of the layer structure 30 . The major surfaces of the sealant layer 33 include a first major surface 33A and a second major surface 33B. The material forming the sealant layer 33 is a thermoplastic resin. Thermoplastic resins are, for example, polyethylene and polypropylene. Preferably, the thermoplastic resin is block polypropylene, which includes polyethylene within polypropylene.

An adhesive layer 34 is formed between each layer. The adhesive layer 34 is constructed by any adhesive means. In one example, the adhesive layer 34 is composed of an adhesive such as a two-component curable urethane resin. In another example, the adhesive layer 34 is made of a heat-sealable resin. 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 together. Adhesive layer 34 includes a second adhesive layer 34B provided between intermediate layer 32 and sealant layer 33 . The second adhesive layer 34B bonds the second major surface 32B of the intermediate layer 32 and the first major surface 33A of the sealant layer 33 together.

Layer structure 30 further comprises an ink layer 35 . The ink layer 35 displays information about the contents C of the vapor-sealing pouch 10 by displaying characters or graphics. The information about the content C includes information about an appropriate cooking method and nutrition of the food when the content C is food. The ink layer 35 is provided on the first main surface 31A of the base material layer 31 . The ink layer 35 is selected from among known printing methods, and is appropriately selected in consideration of printability of the base material layer 31, design properties such as color tone, adhesion with other layers, safety as the vapor-steaming pouch 10, and the like. selected. The printing method is, for example, a gravure printing method, an offset printing method, a gravure offset printing method, a flexographic printing method, or an inkjet printing method. An overprint varnish may be further printed on the ink layer 35 .

The vapor-vapor pouch 10 further includes an easy-peeling layer 60 for facilitating peeling of the structure included in the layer structure 30 when the vapor-vapor pouch 10 is opened. The easy peeling layer 60 is provided between the layer containing the paper layer and the adhesive layer 34 . The easy peeling layer 60 weakens the adhesion between the layer including the paper layer and the adhesive layer 34 by being heated.

In one example, the easy peeling layer 60 contains varnish 61 . The varnish 61 includes a first varnish 61A printed on the surface of the paper layer and a second varnish 61B printed on the first varnish 61A. The first varnish 61A is used for sealing the paper layers. The second varnish 61B is used for easy peeling between the layer containing the paper layer and the adhesive layer 34 .

The steamable pouch 10 further includes an easy-to-open portion 70 that facilitates opening when the steamable pouch 10 is opened. The easy-open portion 70 includes a perforation line 71 and a notch 72 . The tear line 71 is provided at least partially 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 straight. The perforation line 71 is composed of a plurality of perforations 71A. Preferably, a plurality of perforations 71A are provided in the standard height direction XB.

The position of the easy-to-open portion 70 in the standard height direction XB can be arbitrarily selected. In the illustrated example, the easy-to-open portion 70 is provided below the vapor passage portion 50 . The easy-to-open portion 70 is provided above the upper end of the content C. As shown in FIG. A perforation line 71 is provided on the abdomen of the pouch body 11 .

As shown in FIG. 2 , the perforation 71A penetrates at least the ink layer 35 and the base layer 31 in the lamination direction of the layer structure 30 . At least a portion of the perforation 71A is provided in the stacking direction of the easy peeling layer 60 . In this embodiment, the perforation 71A penetrates the easy peeling layer 60 .

The notch 72 is formed such that the tip portion 72A of the notch 72 is positioned on the tear line 71 or an imaginary line extending from the tear line 71 . A 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 a notch 72 is formed in the first side seal portion 43 .

A preferred location where the easy peeling layer 60 is provided will be described. The easily peeling layer 60 is provided so that at least a portion of the layer structure 30 is aligned with the tear line 71 in the stacking direction. Further, the easily peelable layer 60 is preferably provided within a predetermined range R including the entire perforation line 71 when the vapourizable pouch 10 is viewed from the front. If the perforation line 71 is not provided, the easy peel layer 60 is preferably provided, for example, from the tip 72A of the notch 72 along the imaginary perforation line. The imaginary cut line is a linear portion extending from the tip portion 72A.

An example of a method of filling the content C into the pervaporized pouch 10 will be described. One of the seal portions 41 to 44 of the vapor-sealing pouch 10 before filling is not sealed. In one example, the upper seal portion 41 is not formed. An opening (not shown) is formed in a portion where the upper seal portion 41 is formed. The upper seal portion 41 is formed by filling the content C from the opening and heat-sealing the corresponding portion. As a result, the contents C are preserved in the pervapor-type pouch 10 .

The action of the vapor-steaming pouch 10 of the embodiment will be described.
Vapor-type pouch 10 is heated by heating means for heating contents C. As shown in FIG. An example of a heating means is a microwave oven. As the steamable pouch 10 is heated, the content C generates steam. Since the accommodation space S is closed by the seal portion 40, the pressure in the accommodation space S rises as water vapor is generated. As the pressure rises, the vapor passage seal portion 51 of the vapor passage portion 50 is peeled off. Therefore, the housing space S is connected to the outside through the unsealed portion 52 . As the water vapor generated in the accommodation space S escapes from the vapor passage part 50, the increase in the pressure in the accommodation space S is suppressed.

After the heating of the steamable pouch 10 is completed, the user opens the steamable pouch 10 along the tear line 71 of the easy-to-open portion 70 . The paper peeling of the steamable pouch 10 occurs, for example, when the steamable pouch 10 is opened, because the paper layer included in the base material layer 31 is not properly separated from the first adhesive layer 34A. The vapor-permeable pouch 10 of the embodiment is provided with an easily peelable layer 60 on the paper layer included in the base material layer 31 . Therefore, paper peeling is suppressed.

In the vapor-permeable pouch 10 , the easy-to-open portion 70 is provided below the vapor-permeable portion 50 . According to this configuration, for example, the following effects can be obtained. When the steamable pouch 10 is heated, the easily peelable layer 60 becomes susceptible to heat. The heat tends to reduce the strength of the varnish 61 of the easy peeling layer 60 . The portion of the base material layer 31 where the perforation line 71 is provided tends to be lifted from the first adhesive layer 34A. Therefore, paper peeling is less likely to occur.

According to the vapor-permeable pouch 10 of the embodiment, the following effects are further obtained.
Since the basis weight of the paper constituting the paper layer in the base material layer 31 is 30 g/m ² or more, even when the resin material constituting the base material layer 31 and the intermediate layer 32 is small, the pervaporization pouch 10 can be suitably manufactured. strength can be maintained. Since the basis weight of the paper constituting the paper layer is less than 200 g/m ² , various costs in manufacturing the steamable pouch 10 are reduced.

<Comparative test>
The inventors of the present disclosure conducted comparative tests using the vapor-ventilating pouches 10 of Examples and Comparative Examples. In the comparative test, after the heat treatment, the ventilating pouch 10 was opened from the notch 72 and the presence or absence of paper peeling was confirmed. The heat treatment is heating with a 600 W microwave oven. The heat treatment was carried out until the vapor was removed from the vapor passage section 50 . The presence or absence of paper peeling was visually confirmed. It was determined that there was paper peeling when there was paper peeling outside a predetermined range R from the cut line 71 of the easy-to-open portion 70 shown in FIG. 3 or the virtual cut line. The predetermined range R is a range of 2 mm from the edge of the perforation line 71 or the virtual perforation line. It was determined that there was no paper peeling when there was paper peeling within a predetermined range R from the notch 72 of the easy-to-open portion 70 to the tearing line 71 or from the virtual tearing line or when there was no paper peeling within the predetermined range.

(Example 1)
The configuration of the pervaporization pouch 10 of Example 1 will be described. The first sheet 21 and the second sheet 22 forming the pouch body 11 have the same configuration. The sheet 20 of the pouch body 11 has a base layer 31 made of paper, an intermediate layer 32 made of polyethylene terephthalate, and a sealant layer 33 made of unstretched polypropylene. The easy peeling layer 60 was formed between the base layer 31 and the intermediate layer 32 . The easy peeling layer 60 includes a first varnish 61A and a second varnish 61B. The easy peeling layer 60 was configured to include the entire predetermined range R. Overprint varnish was printed on the ink layer 35 . The perforation 71A was provided from the overprint varnish to the easy peeling layer 60 in the stacking direction. The first sheet 21 and the second sheet 22 forming the bottom portion 12 have the same configuration. The sheet 20 of the bottom portion 12 has a base layer 31 made of polyethylene terephthalate, an intermediate layer 32 made of nylon, and a sealant layer 33 made of unstretched polypropylene.

(Example 2)
The configuration of the pervaporization pouch 10 of Example 2 will be described. The first sheet 21 and the second sheet 22 forming the pouch body 11 have the same configuration. The sheet 20 of the pouch body 11 has a base layer 31 made of paper, an intermediate layer 32 made of polyethylene terephthalate, and a sealant layer 33 made of unstretched polypropylene. The easy peeling layer 60 was formed between the base layer 31 and the intermediate layer 32 . The easy peeling layer 60 includes a first varnish 61A and a second varnish 61B. Overprint varnish was printed on the ink layer 35 . 71 A of perforations are not provided. The first sheet 21 and the second sheet 22 forming the bottom portion 12 have the same configuration. The sheet 20 of the bottom portion 12 has a base layer 31 made of polyethylene terephthalate, an intermediate layer 32 made of nylon, and a sealant layer 33 made of unstretched polypropylene.

(Example 3)
The configuration of the pervaporization pouch 10 of Example 3 will be described. The first sheet 21 and the second sheet 22 forming the pouch body 11 have the same configuration. The sheet 20 of the pouch body 11 has a base layer 31 made of paper, an intermediate layer 32 made of polyethylene terephthalate, and a sealant layer 33 made of unstretched polypropylene. The easy peeling layer 60 was formed between the base layer 31 and the intermediate layer 32 . The easy peeling layer 60 includes a first varnish 61A and a second varnish 61B. The ink layer 35 was further laminated with polyethylene terephthalate. 71 A of perforations were provided from the ink layer 35 to the easy peeling layer 60 in the lamination direction. The first sheet 21 and the second sheet 22 forming the bottom portion 12 have the same configuration. The sheet 20 of the bottom portion 12 has a base layer 31 made of polyethylene terephthalate, an intermediate layer 32 made of nylon, and a sealant layer 33 made of unstretched polypropylene.

(Example 4)
The configuration of the pervaporization pouch 10 of Example 4 will be described. The first sheet 21 and the second sheet 22 forming the pouch body 11 have the same configuration. The sheet 20 of the pouch body 11 has a base layer 31 made of paper, an intermediate layer 32 made of polyethylene terephthalate, and a sealant layer 33 made of unstretched polypropylene. The easy peeling layer 60 was formed between the base layer 31 and the intermediate layer 32 . The easy peeling layer 60 includes a first varnish 61A and a second varnish 61B. Overprint varnish was printed on the ink layer 35 . The perforation 71A was provided from the overprint varnish to the easy peeling layer 60 in the stacking direction. The first sheet 21 and the second sheet 22 forming the bottom portion 12 have the same configuration. The sheet 20 of the bottom portion 12 has a base layer 31 made of paper, an intermediate layer 32 made of polyethylene terephthalate, and a sealant layer 33 made of unstretched polypropylene.

(Comparative example 1)
The configuration of the pervaporization pouch 10 of Comparative Example 1 will be described. The vapor-vapor-type pouch 10 of Comparative Example 1 has a structure in which the easily peelable layer 60 is removed from the vapor-vapor-type pouch 10 of Example 1. FIG. The perforation 71A was provided from the overprint varnish to the base material layer 31 in the stacking direction.

(Comparative example 2)
The configuration of the pervaporization pouch 10 of Comparative Example 2 will be described. Vapor-vapor pouch 10 of Comparative Example 2 does not have perforation 71A in Vapor-vapor pouch 10 of Comparative Example 1. FIG. Otherwise, it is the same as the pervaporization pouch 10 of Comparative Example 1.

(Comparative Example 3)
The configuration of the pervaporization pouch 10 of Comparative Example 3 will be described. In the vapor-permeable pouch 10 of Comparative Example 3, the first sheet 21 and the second sheet 22 constituting the pouch body 11 have the same configuration. The first sheet 21 and the second sheet 22 forming the bottom portion 12 have the same configuration. The base layer 31 is made of polyethylene terephthalate, the intermediate layer 32 is made of nylon, and the sealant layer 33 is made of unstretched polypropylene. The vapor-permeable pouch 10 of Comparative Example 3 does not include the structure of the paper layer, the easy peeling layer 60, and the perforations 71A.

Table 1 below shows the results of the comparative tests.

Since the easily peelable layer 60 was provided, the paper peeling did not occur in the steamable pouches 10 of Examples 1 to 4. On the other hand, in the steamable pouch 10 of the comparative example, paper peeling occurred even when the perforations 71A of the easy-to-open portion 70 were provided. Since Comparative Example 3 does not include a paper layer, the presence or absence of paper peeling was not determined.

(Modification)
The description of the embodiment is an illustration of the form that the pervaporized pouch according to the present invention can take, and is not intended to limit the form. The vapour-type pouch according to the present invention can take a form other than the embodiments, for example, modifications of the embodiments shown below, and combinations of at least two mutually consistent modifications.

- As for the steamable pouch 10 of a modification, the intermediate|middle layer 32 contains a paper layer. In this case, it is preferable that the easy peeling layer 60 is formed at least on the second adhesive layer 34B. The substrate layer 31 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 deposited. Another example is nylon. Both the base layer 31 and the intermediate layer 32 may contain a paper layer. In this case, at least one of the base layer 31 and the intermediate layer 32 preferably contains a resin layer.

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

- In the steamable pouch 10 of the modification, the easy-to-open portion 70 is provided at a position different from that of the embodiment. In one example, the easy-to-open portion 70 is provided above the vapor passage portion 50 . The easy-to-open portion 70 is provided below the upper seal portion 41 .

- The sheet 20 forming the pouch body 11 and the sheet 20 forming the bottom portion 12 may have different structures. The sheet 20 forming the bottom may be constructed as a gusset sheet.

The base material layer 31 may be composed of a paper layer and a layer composed of a material other than paper. In this case, the paper layer is formed on the second main surface 31B side. A peelable layer 60 is provided between the paper layer and the first adhesive layer 34A.

DESCRIPTION OF SYMBOLS 10... Steaming type pouch 20... Sheet 21... 1st sheet 22... 2nd sheet 30... Layer structure 31... Base material layer 32... Intermediate layer 33... Sealant layer 40... Sealing part 50... Steaming part 60... Easy peeling layer 70 ... Easy opening part

Claims (6)

A permeable pouch that forms a storage space for storing a content by a sheet including a layered structure in which a plurality of layers are laminated and a sealing portion that seals the sheet,
The layer structure includes a paper layer,
A vapor-permeable pouch in which an easily peelable layer is formed on at least a portion of the paper layer. The sheet includes a first sheet and a second sheet,
The vapor-vapor pouch according to claim 1, wherein the easily peelable layer is formed on at least one of the first sheet and the second sheet. The steamable pouch according to claim 1 or 2, wherein the easily peelable layer contains varnish. The steaming according to any one of claims 1 to 3, wherein the sheet further comprises an easy-open part, and at least a part of the easy-open part coincides with the easily peelable layer in the lamination direction of the plurality of layers. mold pouch. The vapor-vapor-type pouch according to any one of claims 1 to 4, further comprising a vapor-vaporizing part that releases the gas in the storage space. The pervaporization pouch according to any one of claims 1 to 5, wherein the contents are accommodated in the accommodation space.

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