Steam-through pouch

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

[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 structure 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 above-mentioned pouch, when the paper layer is not properly separated from the other layers upon opening, there is a risk of the paper layer peeling off. The peeled off portion may cause a loss of design and may become dirty due to contact with the contents of the pouch. [Means for solving the problem]

[0005] The steam-permeable pouch of the present disclosure is a steam-permeable pouch that forms a storage space for storing contents by a sheet including a layered structure in which multiple layers are stacked, and a sealing part that seals the sheet, and the layered structure includes a paper layer, and an easily peelable layer is formed on at least a portion of the paper layer. Effect of the Invention

[0006] The above steam-passing pouch is unlikely to cause peeling of the paper layer constituting the steam-passing pouch when opened. [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. [Diagram 3] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] (An example of the form that a steam-passing pouch can take) (1) A steam-permeable pouch according to the present disclosure is a steam-permeable pouch that forms a storage space for storing contents by a sheet including a layered structure in which multiple layers are stacked, and a seal part that seals the sheet, wherein the layered structure includes a paper layer, and an easily peelable layer is formed in at least a portion of the paper layer. In a steam-passing pouch including a paper layer, there is a risk of paper peeling occurring when the pouch is opened. Paper peeling is a phenomenon in which paper layers peel off from each other. Paper peeling includes a state in which the paper layer becomes frayed due to peeling between the paper layers and a state in which the peeled paper layer is gouged out. Peeling between paper layers occurs when the paper layer does not peel off from the other layers that make up the layer structure, but is subjected to a force associated with opening. With this steam-passing pouch, an easily peelable layer is provided, so that the paper layer is easily peeled off from the other layers that make up the layer structure, for example, when the pouch is opened. As a result, paper peeling is less likely to occur.

[0009] (2) According to one example of the steam-permeable pouch, the sheets include 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 steam-permeable pouch, since an easily peelable layer is formed on at least one of the first sheet and the second sheet, for example, the paper is less likely to peel off when the pouch is opened.

[0010] (3) According to one example of the steam-permeable pouch, the easily peelable layer contains varnish. According to this steam-passing pouch, for example, the paper is less likely to peel off when it is opened.

[0011] (4) According to one example of the steam-permeable pouch, the sheet further includes an easy-open portion, at least a portion of which coincides with the easy-peel layer in the stacking direction of the plurality of layers. According to this steam-permeable pouch, the steam-permeable pouch can be easily opened through the easy-open portion. Furthermore, when the pouch is opened through the easy-open portion, the paper is less likely to peel off.

[0012] (5) According to one embodiment of the steam-passing pouch, the pouch further includes a steam-passing portion that releases gas from the storage space. According to this steam-permeable pouch, water vapor generated in the storage space when the steam-permeable pouch is heated can be suitably released to the outside.

[0013] (6) According to one example of the steam-permeable pouch, the contents are accommodated in the accommodation space. This steam-permeable pouch allows the contents to be preserved in an appropriate manner.

[0014] <Embodiment> A steam-permeable pouch 10 according to an embodiment will be described with reference to Figs. 1 to 3. 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 capable of being heated with the contents placed therein. The steam-permeable pouch 10 is configured to be capable of discharging 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 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. In the following description, 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.

[0015] The steam-permeable pouch 10 includes a pouch body 11 and a bottom 12. The pouch body 11 constitutes a major 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.

[0016] The standard length in the width direction XA 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 accommodated and the ease of carrying the steam-permeable pouch 10. In one example, the standard length in the width direction XA of the pouch body 11 and the bottom portion 12 is in the range of 140 to 170 mm. In one example, the standard length in the width direction XA of the pouch body 11 and the bottom portion 12 is 152 mm.

[0017] The length of the pouch body 11 and the bottom 12 in the standard height direction XB 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. According to one example, the height of the pouch body 11 and the bottom 12 is in the range of 140 to 170 mm. In one example, the length of the pouch body 11 and the 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 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 bottom 12 in the standard height direction XB is 45 mm.

[0018] The steam-permeable pouch 10 includes a sheet 20 that constitutes the pouch body 11 and the bottom 12, a sealing portion 40 that forms a 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 made up 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, thereby forming a storage space S 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.

[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 passage part 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 vapor-passing pouch 10. In a preferred example, the vapor passage part 50 is configured to open when the pressure in the storage space S increases to a pressure within a predetermined pressure range.

[0025] The position of the steam-passing portion 50 in the steam-passing pouch 10 can be selected arbitrarily. In a first example, the steam-passing portion 50 is provided in the first side seal portion 43. In a second example, the steam-passing portion 50 is provided in the second side seal portion 44. In a third example, the steam-passing portion 50 is provided in both the first side seal portion 43 and the second side seal portion 44. The steam-passing pouch 10 of this embodiment shows the steam-passing portion 50 of the second example.

[0026] In one example, the steam-passing section 50 is provided between the upper seal section 41 and the upper end of the contents C in the standard height direction XB. The steam-passing section 50 includes a steam-passing seal section 51 and an unsealed section 52. In one example, the steam-passing seal section 51 is configured to have a lower seal strength than the first side seal section 43 and the second side seal section 44. In another example, the steam-passing seal section 51 is configured to have a narrower seal width than the first side seal section 43 and the second side seal section 44. Preferably, the steam-passing seal section 51 is configured to protrude toward the storage space S. The seal of the steam-passing seal section 51 peels off as the pressure in the storage space S increases, thereby connecting the storage space S and the unsealed section 52.

[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 the same layer structure 30. The sheet 20 constituting the pouch body 11 and the sheet 20 constituting the bottom 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 includes any configuration taking into consideration strength, heat resistance, water resistance, gas barrier properties, and the like depending on the application of the steam-passing pouch 10. In this embodiment, the layer structure 30 includes a base 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 / m 2 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 surfaces include a first main surface 32A and a second main surface 32B. The material constituting the intermediate layer 32 is made 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, the material is nylon.

[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.

[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 further includes an ink layer 35. The ink layer 35 displays characters or figures and displays information about the contents C of the steam-passing pouch 10. When 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 35 is provided on the first main surface 31A of the base layer 31. The ink layer 35 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-passing 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 35.

[0034] The steam-permeable pouch 10 further includes an easily peelable layer 60 for making it easy to peel off the components included in the layer structure 30 when the steam-permeable pouch 10 is opened. The easily peelable layer 60 is provided between the layer including the paper layer and the adhesive layer 34. The easily peelable layer 60 weakens the adhesion between the layer including the paper layer and the adhesive layer 34 when heated.

[0035] In one example, the easily peelable layer 60 includes a 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 to seal the paper layer. The second varnish 61B is used to easily peel the layer including the paper layer from the adhesive layer 34.

[0036] 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 71A. Preferably, a plurality of perforations 71A are provided in the standard height direction XB.

[0037] The position of the easy-open portion 70 in the standard height direction XB can be selected arbitrarily. In the illustrated example, the easy-open portion 70 is provided below the steam passage portion 50. The easy-open portion 70 is provided above the upper end of the contents C. The cut line 71 is provided in the abdominal portion of the pouch body 11.

[0038] 2, the perforation 71A penetrates at least the ink layer 35 and the base material layer 31 in the stacking direction of the layer structure 30. The perforation 71A is provided at least in a portion in the stacking direction of the easily peelable layer 60. In this embodiment, the perforation 71A penetrates the easily peelable layer 60.

[0039] 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.

[0040] A preferred location for providing the easily peelable layer 60 will be described. The easily peelable layer 60 is provided so that at least a portion of it coincides with the cut line 71 in the lamination direction of the layer structure 30. The easily peelable layer 60 is preferably provided within a predetermined range R including the entire cut line 71 when viewed from the front of the steam-passing pouch 10. When the cut line 71 is not provided, the easily peelable layer 60 is preferably provided, for example, from the tip 72A of the notch 72 along a virtual cut line. The virtual cut line is a straight portion extending from the tip 72A as a starting point.

[0041] 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 corresponding portion is heat-sealed to form the upper sealed portion 41. As a result, the contents C are preserved in the steam-permeable pouch 10.

[0042] The operation of the steam-permeable 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. As the steam-passing pouch 10 is heated, water vapor is generated from the contents C. Because the storage space S is closed by the sealed portion 40, the pressure in the storage space S increases with the generation of water vapor. As the pressure increases, the steam-passing sealed portion 51 of the steam-passing portion 50 is peeled off. This connects the storage space S to the outside via the unsealed portion 52. The increase in pressure in the storage space S is suppressed by the escape of water vapor generated in the storage space S from the steam-passing portion 50.

[0043] After the heating of the steam-passing pouch 10 is completed, the user opens the steam-passing pouch 10 along the tear line 71 of the easy-open portion 70. Paper peeling of the steam-passing pouch 10 occurs, for example, when the paper layer included in the base material layer 31 does not peel off appropriately from the first adhesive layer 34A when the steam-passing pouch 10 is opened. In the steam-passing pouch 10 of the embodiment, an easy-peel layer 60 is provided on the paper layer included in the base material layer 31. This prevents paper peeling.

[0044] In the steam-permeable pouch 10, the easy-open portion 70 is provided below the steam-permeable portion 50. This configuration provides the following effects, for example: When the steam-permeable pouch 10 is heated, the easy-peel layer 60 is easily affected by the heat. The strength of the varnish 61 of the easy-peel layer 60 is easily reduced by heat. The portion of the base material layer 31 where the cut line 71 is provided is easily lifted up relative to the first adhesive layer 34A. This makes it more difficult for the paper to peel off.

[0045] The steam-permeable pouch 10 of the embodiment further provides the following effects. The paper constituting the paper layer in the base material layer 31 has a basis weight of 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] <Comparative Test> The inventor of the present disclosure conducted a comparative test using the steam-passing pouch 10 of the embodiment and the comparative example. In the comparative test, the steam-passing pouch 10 was opened from the notch 72 after the heat treatment, and the presence or absence of peeling of the paper was confirmed. The heat treatment was performed by heating in a 600W microwave oven. The heat treatment was performed until steam escaped from the steam passage portion 50. The presence or absence of peeling of the paper was confirmed visually. When peeling of the paper was present outside the predetermined range R from the cut line 71 or the virtual cut line of the easy-open portion 70 shown in FIG. 3, it was determined that peeling of the paper was present. The predetermined range R is a range of 2 mm from the end of the cut line 71 or the virtual cut line. When peeling of the paper was present within the predetermined range R from the notch 72 of the easy-open portion 70 to the cut line 71 or the virtual cut line, or when peeling of the paper was not present within the predetermined range, it was determined that peeling of the paper was not present.

[0047] Example 1 The configuration of the steam-passing pouch 10 of Example 1 will be described. The first sheet 21 and the second sheet 22 constituting the pouch body 11 are each of the same configuration. The sheet 20 of the pouch body 11 is configured such that the base layer 31 is made of paper, the intermediate layer 32 is made of polyethylene terephthalate, and the sealant layer 33 is made of unstretched polypropylene. The easily peelable layer 60 is formed between the base layer 31 and the intermediate layer 32. The easily peelable layer 60 includes a first varnish 61A and a second varnish 61B. The easily peelable layer 60 is configured to include the entire predetermined range R. An overprint varnish is printed on the ink layer 35. The perforations 71A are provided from the overprint varnish to the easily peelable layer 60 in the stacking direction. The first sheet 21 and the second sheet 22 constituting the bottom 12 are each of the same configuration. The sheet 20 of the bottom portion 12 had a base layer 31 made of polyethylene terephthalate, an intermediate layer 32 made of nylon, and a sealant layer 33 made of unstretched polypropylene.

[0048] Example 2 The configuration of the steam-passing pouch 10 of Example 2 will be described. The first sheet 21 and the second sheet 22 constituting the pouch body 11 are of 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 easily peelable layer 60 is formed between the base layer 31 and the intermediate layer 32. The easily peelable layer 60 includes a first varnish 61A and a second varnish 61B. The ink layer 35 is printed with an overprint varnish. The perforations 71A are not provided. The first sheet 21 and the second sheet 22 constituting the bottom 12 are of the same configuration. The sheet 20 of the bottom 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.

[0049] Example 3 The configuration of the steam-passing pouch 10 of Example 3 will be described. The first sheet 21 and the second sheet 22 constituting the pouch body 11 are of 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 easily peelable layer 60 is formed between the base layer 31 and the intermediate layer 32. The easily peelable layer 60 includes a first varnish 61A and a second varnish 61B. Polyethylene terephthalate is further laminated on the ink layer 35. The perforation 71A is provided from the ink layer 35 to the easily peelable layer 60 in the lamination direction. The first sheet 21 and the second sheet 22 constituting the bottom 12 are of the same configuration. The sheet 20 of the bottom portion 12 had a base layer 31 made of polyethylene terephthalate, an intermediate layer 32 made of nylon, and a sealant layer 33 made of unstretched polypropylene.

[0050] Example 4 The configuration of the steam-passing pouch 10 of Example 4 will be described. The first sheet 21 and the second sheet 22 constituting the pouch body 11 are of 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 easily peelable layer 60 is formed between the base layer 31 and the intermediate layer 32. The easily peelable layer 60 includes a first varnish 61A and a second varnish 61B. The ink layer 35 is printed with an overprint varnish. The perforations 71A are provided from the overprint varnish to the easily peelable layer 60 in the lamination direction. The first sheet 21 and the second sheet 22 constituting the bottom 12 are of the same configuration. The sheet 20 of the bottom portion 12 had a base layer 31 made of paper, an intermediate layer 32 made of polyethylene terephthalate, and a sealant layer 33 made of unstretched polypropylene.

[0051] Comparative Example 1 The configuration of the steam-passing pouch 10 of Comparative Example 1 will be described. The steam-passing pouch 10 of Comparative Example 1 has a configuration in which the easily peelable layer 60 is removed from the steam-passing pouch 10 of Example 1. The perforation 71A was provided from the overprint varnish to the base material layer 31 in the lamination direction.

[0052] Comparative Example 2 The configuration of the steam-passing pouch 10 of Comparative Example 2 will be described. The steam-passing pouch 10 of Comparative Example 2 is the same as the steam-passing pouch 10 of Comparative Example 1 except that the perforation 71A is omitted.

[0053] Comparative Example 3 The configuration of the steam-permeable pouch 10 of Comparative Example 3 will be described. In the steam-permeable pouch 10 of Comparative Example 3, the first sheet 21 and the second sheet 22 constituting the pouch body 11 are each of the same configuration. The first sheet 21 and the second sheet 22 constituting the bottom 12 are each of 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 steam-permeable pouch 10 of Comparative Example 3 does not include the configurations of a paper layer, an easily peelable layer 60, and a perforation 71A.

[0054] Table 1 below shows the results of the comparative tests.

[0055] [Table 1]

[0056] By providing the easily peelable layer 60, no paper peeling occurred in the steam-passable pouches 10 of Examples 1 to 4. On the other hand, in the steam-passable pouch 10 of the comparative example, paper peeling occurred even when the perforation 71A of the easily openable portion 70 was provided. Since the comparative example 3 does not include a paper layer, the presence or absence of paper peeling was not judged.

[0057] (Modification) The description of the embodiments is merely an example of possible forms of the steam-permeable pouch according to the present invention, and is not intended to limit the forms. In addition to the embodiments, the steam-permeable pouch according to the present invention may take the following modified forms, or a combination of at least two mutually compatible modified forms.

[0058] In the modified steam-passing pouch 10, the intermediate layer 32 includes a paper layer. In this case, it is preferable that the easily peelable layer 60 is formed on at least the second adhesive layer 34B. The base 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 vapor-deposited. In another example, it is nylon. Both the base layer 31 and the intermediate layer 32 may include a paper layer. In this case, it is preferable that at least one of the base layer 31 and the intermediate layer 32 includes a resin layer.

[0059] The easily peelable layer 60 may be composed of a material other than the varnish 61. In one example, the easily peelable layer 60 is composed of an adhesive weaker than the adhesive constituting the adhesive layer 34. Preferably, the easily peelable layer 60 has a thermal peeling effect that weakens the adhesiveness when the steam-passing pouch 10 is heated.

[0060] In the steam-passing pouch 10 of the modified example, the easy-open portion 70 is provided at a position different from that of the embodiment. In one example, the easy-open portion 70 is provided above the steam-passing portion 50. The easy-open portion 70 is provided below the upper seal portion 41.

[0061] The sheet 20 constituting the pouch body 11 and the sheet 20 constituting the bottom 12 may have different configurations. The sheet 20 constituting the bottom may be a gusset sheet.

[0062] The base 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. The easily peelable layer 60 is provided between the paper layer and the first adhesive layer 34A. [Explanation of symbols]

[0063] 10...Steam-through pouch 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...Easy peeling layer 70…Easy opening part

Claims

1. A steam-permeable pouch that forms a storage space for storing an object by a sheet having a layered structure in which a plurality of layers are laminated and a seal part that seals the sheet, The layer structure includes a paper layer, an adhesive layer, and an easily peelable layer, The steam-passing pouch includes an easy-to-open portion including a tear line provided on the paper layer, The easily peelable layer is provided between the adhesive layer and the area of ​​the paper layer where the tear line is provided. Steam-permeable pouch.

2. The sheet includes a first sheet and a second sheet, The easily peelable layer is formed on at least one of the first sheet and the second sheet. The steam-transferable pouch according to claim 1.

3. The easily peelable layer includes a varnish. The steam-transferable pouch according to claim 1 or 2.

4. The easily openable portion coincides with the easily peelable layer at least in part in the stacking direction of the plurality of layers. The steam-passing pouch according to any one of claims 1 to 3.

5. The storage space further includes a vapor passage portion for discharging gas therefrom. The steam-passing pouch according to any one of claims 1 to 4.

6. The object is accommodated in the accommodation space. The steam-passing pouch according to any one of claims 1 to 5.

Images