JP7380082B2 - pouch - Google Patents

Description

The present invention relates to a pouch obtained by heat-sealing a laminated film.

For example, microwave pouches containing retort food or frozen food are widely used. When a pouch is heated in a microwave oven, the water contained in the contents evaporates as the pouch is heated, increasing the pressure inside the pouch. If the pressure inside the pouch increases, the pouch may burst and the contents may scatter.

Therefore, a pouch has been proposed that is equipped with a steam release mechanism that allows steam generated by heating to escape to the outside of the bag.
Patent Document 1 discloses a self-supporting packaging bag in which a notch is provided in an upper side seal portion and an easily peelable material is used in a heat-sealed portion around the notch. In the self-supporting packaging bag of Patent Document 1, when the pressure inside the pouch increases due to heating, the heat-sealed part made of an easily peelable material peels off, and the accommodation space inside the pouch communicates with the outside of the pouch. The steam inside can escape to the outside through the notch.

Patent Documents 2 to 4 describe a sealed area formed by heat-sealing a laminated film in a surrounding area surrounding a housing space, an unsealed area that is separated from the housing space by the sealed area and is not heat-sealed, and an unsealed area that is not heat-sealed. A pouch is disclosed in which the sealing area has an overhanging portion extending toward the accommodation space at a location where the sealing area is formed. In the pouches of Patent Documents 2 to 4, two laminated films are overlapped and the vicinity of the periphery of the laminated film is heat-sealed to produce the pouch. When the pressure inside the pouch increases due to heating, stress is concentrated at the corners of the overhanging portion. As a result, the sealed area of the protruding portion is peeled off, so that the storage space and the unsealed area are communicated with each other, allowing the steam inside the pouch to escape to the outside.

Japanese Patent Application Publication No. 2010-36968 Japanese Patent Application Publication No. 2015-120550 Japanese Patent Application Publication No. 2016-74457 Japanese Patent Application Publication No. 2016-74458

In the packaging bag of Patent Document 1, it was necessary to form only the heat-sealed portion around the notch with an easily peelable material. There were problems in that the manufacturing process was complicated and the cost increased, and the material cost was also high. In addition, when using easily peelable materials, it is not possible to ensure sufficient sealing strength, and when the pouch is subjected to impact such as when dropped, the heat-sealed area around the notch may peel and the contents may leak. There was a fear that it would come out.

In Patent Documents 2 to 4, the sealant needs to be a material that softens when heated in a microwave oven and reduces seal strength. For this reason, sealant materials are limited. Furthermore, although the formation of an overhang makes it easier for steam to escape, the steam escape may be slow, and at this time, seal regression may occur in the seal portion other than the overhang.

The present invention has been made in view of the above problems, and aims to provide a pouch that can suppress the occurrence of seal regression when internal pressure increases due to heating, and can release steam to the outside from a desired location. purpose.

In order to solve the above problems, the present invention provides the following [1] to [3].
[1] A pouch made by stacking and heat-sealing at least one laminated film having a sealant layer so that the sealant layer is on the inner layer side, and having a storage space for accommodating the contents, It has a side sealed part in which the laminated film is heat-sealed, and an unsealed part that is isolated from the accommodation space by the side sealed part and in which the stacked laminated films are not heat-sealed, and the unsealed part is The side seal portion opens to reach a side edge of the laminated film, and the side seal portion surrounds an upper seal portion and a lower seal portion located on both sides of the unsealed portion, and at least a portion of the unsealed portion. an overhanging seal portion that is connected to the upper seal portion and the lower seal portion in this manner and that extends further toward the housing space than the upper seal portion and the lower seal portion. , the laminated film has a heat-generating ink layer on a layer outside the sealant layer, and the heat-generating ink layer is connected to at least one of at least a portion of the lower seal portion and at least a portion of the upper seal portion. , a pouch provided continuously with at least a portion of the overhanging seal portion.
[2] A pouch made by stacking and heat-sealing at least one laminated film having a sealant layer so that the sealant layer is on the inner layer side, and having a storage space for accommodating the contents, It has a side seal part in which the laminated film is heat-sealed, and an unsealed part in which the stacked laminated films are not heat-sealed and are separated from the accommodation space and the side edge of the laminated film by the side seal part. , the laminated film constituting the unsealed portion is provided with at least one hole or notch passing through the laminated film, and the side seal portion is a side end seal portion located on a side edge side of the laminated film. , an overhanging seal portion that is connected to the side end seal portion on the side opposite to the side edge side of the laminated film and that overhangs the side end seal portion toward the accommodation space side; The protruding sealed portion surrounds at least a portion of the unsealed portion, and the side end sealed portion is located above a central sealed portion and a central sealed portion located at a position corresponding to the position where the unsealed portion is provided. the laminated film has an upper seal portion connected to the overhanging seal portion; and a lower seal portion located below the central seal portion and connected to the overhang seal portion; A heat-generating ink layer is provided on an outer side of the sealant layer, and the heat-generating ink layer covers at least one of at least a portion of the lower seal portion and at least a portion of the upper seal portion, and the overhanging seal portion. A pouch that is continuous with at least a portion of the pouch.
[3] The pouch according to [1] or [2], wherein the heat generating ink layer is provided on at least a portion of the upper seal portion and a region of the overhanging seal portion that is close to the upper seal portion.

According to the present invention, it is possible to obtain a pouch that can suppress the occurrence of seal regression when the internal pressure increases due to heating and can release steam to the outside from a desired location.

FIG. 1 is a plan view showing a pouch according to an embodiment of the present invention. It is a cross-sectional schematic diagram showing the layer structure of a laminated film. FIG. 2 is an enlarged view of a first side seal portion near an unsealed portion of the pouch according to the first embodiment. It is a modification of the pouch according to the first embodiment, and is an enlarged view of the first side seal portion near the unsealed portion. It is a modification of the pouch according to the first embodiment, and is an enlarged view of the first side seal portion near the unsealed portion. FIG. 7 is an enlarged view of the first side seal portion near the unsealed portion of the pouch according to the second embodiment. FIG. 7 is an enlarged view of the first side seal portion near the unsealed portion of the pouch according to the second embodiment. FIG. 7 is an enlarged view of the first side seal portion near the unsealed portion of the pouch according to the second embodiment. It is an enlarged view of the 1st side seal part of the unsealed part vicinity of the pouch concerning 3rd Embodiment. It is an enlarged view of the 1st side seal part of the unsealed part vicinity of the pouch concerning 3rd Embodiment. It is an enlarged view of the 1st side seal part of the unsealed part vicinity of the pouch concerning 3rd Embodiment. It is an enlarged view of the 1st side seal part of the unsealed part vicinity of the pouch concerning 4th Embodiment. It is an enlarged view of the 1st side seal part of the unsealed part vicinity of the pouch concerning 5th Embodiment. FIG. 6 shows a top view of a pouch of another embodiment of the invention. It is an enlarged view of the 1st side seal part near an unsealed part in a pouch concerning a 6th embodiment. It is an enlarged view of the 1st side seal part near an unsealed part in a pouch concerning a 6th embodiment. It is a sectional view showing an example of an unsealed part vicinity in a pouch concerning a 6th embodiment. It is an enlarged view of the 1st side seal part near an unsealed part in a pouch concerning a 7th embodiment. It is an enlarged view of the 1st side seal part near the unsealed part in the pouch concerning 8th Embodiment.

The present invention will be explained in detail below. Note that the numerical range notation "AA to BB" in this specification means "more than or equal to AA and less than or equal to BB."

The present invention is a pouch made by stacking and heat-sealing at least one laminated film having a sealant layer so that the sealant layer is on the inner layer side, and having a storage space for storing contents, It has a side seal portion where the laminated film is heat-sealed, and an unsealed portion which is isolated from the housing space by the side seal portion and where the stacked laminated films are not heat-sealed, and the unsealed portion is , the side seal portion opens to reach a side edge of the laminated film, and the side seal portion includes an upper seal portion and a lower seal portion located on both sides of the unsealed portion, and at least a portion of the unsealed portion. an overhanging seal portion that is connected to the upper seal portion and the lower seal portion in a surrounding manner and that extends further toward the housing space than the upper seal portion and the lower seal portion; The laminated film has a heat-generating ink layer on a layer outer than the sealant layer, and the heat-generating ink layer has at least one of at least a portion of the lower seal portion and at least a portion of the upper seal portion. and at least a portion of the overhanging seal portion.

The present invention also provides a pouch that is made by stacking and heat-sealing at least one laminated film having a sealant layer so that the sealant layer is on the inner layer side, and having a storage space for storing contents. , a side seal portion where the laminated film is heat-sealed; and an unsealed portion where the laminated film is not heat-sealed and is isolated from the accommodation space and the side edge of the laminated film by the side seal portion. the laminated film constituting the unsealed portion is provided with at least one hole or incision passing through the laminated film, and the side seal portion includes a side edge seal located on a side edge side of the laminated film. and an overhanging seal portion that is connected to the side end seal portion on the side opposite to the side edge side of the laminated film and that extends beyond the side end seal portion toward the accommodation space side, The overhanging seal portion surrounds at least a portion of the unsealed portion, and the side end seal portion includes a central seal portion located at a position corresponding to the position where the unsealed portion is provided, and an upper side of the central seal portion. The laminated film has an upper seal portion located below the center seal portion and connected to the overhang seal portion, and a lower seal portion located below the center seal portion and connected to the overhang seal portion. , a heat-generating ink layer is disposed on an outer side of the sealant layer, and the heat-generating ink layer is connected to at least one of at least a portion of the lower seal portion and at least a portion of the upper seal portion, and the overhanging seal. It is a pouch provided continuously between at least a part of the parts.

[Pouch]
FIG. 1 shows a plan view of a pouch according to an embodiment of the present invention. The pouch shown in FIG. 1 is a flat bag type pouch. In the pouch 1, two sheets 11 (a front sheet 11a and a back sheet 11b) are arranged one on top of the other, and the vicinity of the side edges 13 and lower edges 14 of the sheets 11 are heat-sealed to each other. As a result, a storage space 2 for storing contents is formed between the two sheets 11.

As shown in FIG. 1, in the pouch 1, an opening 4 is formed between the upper edges 12 of the sheet 11. The pouch 1 is designed to have a wide opening 4, so that the contents can be efficiently filled into the storage space 2 through the opening 4. After the contents are filled, the vicinity of the upper edge 12 where the opening 4 is provided is sealed by heat sealing to obtain the pouch 1.

Note that the present invention is similarly applicable to pouches of other shapes such as standing pouches, gusset pouches, box pouches, four-sided pouches, and three-sided pouches.

[Laminated film]
In this embodiment, at least one of the two sheets 11 is made of a laminated film 30.
FIG. 2 is a schematic cross-sectional view showing the layer structure of the laminated film 30. The pouch is made by heat-sealing two sheets of laminated film 30. The laminated film 30 is provided with a sealant layer 34 having sealing properties on the inner side of the container. Further, in the laminated film 30, a base material layer 31 serving as a printing base material is provided in a portion that is closer to the outside of the container than the sealant layer 34. A heat generating ink layer 36 is provided in the laminated film 30 between the base material layer 31 and the sealant layer 34. Furthermore, the laminated film 30 includes an intermediate base layer 33 between the base layer 31 and the sealant layer 34 in order to provide various functions required for a microwave pouch.

The pouch 1 of this embodiment has been described using as an example a case where two sheets 11 are overlapped to form a bag, but one sheet (laminated film 30) is formed so that the sealant layer 34 is on the inner side of the container. It may be a pouch that is folded to form a bag.

Depending on the type of pouch, the number of laminated films used can be changed as appropriate. For example, in the case of a standing pouch, it is preferable to use three laminated films: a top sheet, a back sheet, and a bottom sheet. In this case, the bottom sheet is preferably made of a film having the same structure as the laminated film 30 illustrated in FIG. 2, except that the heat generating ink layer is not provided.

Each layer will be explained in detail below.
[Base material layer]
The base material layer 31 is a layer located at the outermost side of the laminated film 30 when the pouch 1 is formed by bag making.
The base material layer 31 has transparency so that a pattern layer 32 (described later) laminated on the inner surface of the base material layer 31 can be visually recognized through the base material layer 31 when the pouch 1 is made into a bag. It is preferable that you do so.
Furthermore, the pouch 1 for use in a microwave oven is required to have resistance to heat. Therefore, the base material layer 31 of this embodiment is made of a heat-resistant material. For example, as the base material layer 31, a stretched polyethylene terephthalate film, a stretched nylon film, a stretched polypropylene film, a polypropylene/ethylene-vinyl alcohol copolymer co-extruded co-stretched film, or a composite film in which two or more of these films are laminated. Can be used.
The above-mentioned film may be a film coated with an inorganic material such as silicon oxide or aluminum oxide, or a film coated with an ethylene-vinyl alcohol copolymer in order to improve gas barrier properties.

The thickness of the base material layer 31 is preferably 10 to 50 μm, for example. With this thickness range, the heat resistance required for the pouch 1 can be satisfied while reducing the product cost.

[Exothermic ink layer]
In this embodiment, a heat-generating ink layer 36 is laminated on the surface of the base material layer 31 facing the accommodation space. That is, the heat generating ink layer 36 is provided between the base material layer 31 and the sealant layer 34. The heat-generating ink layer 36 is formed at a predetermined location within the plane of the base material layer 31 so that it will be provided at a predetermined position when the pouch 1 is formed as described later.
The thickness of the exothermic ink layer is preferably 0.1 μm or more, more preferably 0.5 μm or more, considering the amount of heat generated during heating in a microwave oven, coatability, manufacturing cost, etc. In addition, from the viewpoint of preventing damage to the laminated film due to heat generated during heating in a microwave oven, the thickness of the heat-generating ink layer is preferably 5 μm or less, more preferably 4 μm or less, and 3 μm or less. It is particularly preferable that there be.

The heat-generating ink layer 36 includes a material that absorbs microwaves. Examples of the material that absorbs microwaves include one or more selected from conductive polymers and conductive particles. Among these, conductive polymers are preferable because they have good visible light transparency and are less likely to cause sparks due to microwaves.
The conductive polymer is preferably one or more compounds selected from polythiophenes, polypyrroles, polyanilines, polyacetylenes, polyphenylenes, polyphenylene vinylenes, polyacenes, and polythiophene vinylenes, and in addition to these compounds, a dopant may also be used. It is more preferable to include.
Dopants include halogens, Lewis acids, protonic acids, organic carboxylic acids, transition metal halides, electrolyte anions, organic cyano compounds, quinones, alkali metals, alkaline earth metals, amino acids, nucleic acids, surfactants, pigments, Alkylammonium ions and quaternary phosphonium salts are mentioned.
Conductive particles include carbon black and metal particles.

When using conductive particles, the heat-generating ink layer preferably contains a binder resin. Furthermore, even when using a conductive polymer, other resins may be contained in order to adjust the conductivity. The resin is not particularly limited as long as it does not inhibit heat generation. Examples of the resin include polyolefin resins such as polyethylene resins and chlorinated polypropylene resins, poly(meth)acrylic resins, polyvinyl chloride resins, polyvinyl acetate resins, vinyl chloride-vinyl acetate copolymers, Polystyrene resin, styrene-butadiene copolymer, vinylidene fluoride resin, polyvinyl alcohol resin, polyvinyl acetal resin, polyvinyl butyral resin, polybutadiene resin, polyester resin, polyamide resin, alkyd resin, epoxy resin Resin, unsaturated polyester resin, thermosetting poly(meth)acrylic resin, melamine resin, urea resin, polyurethane resin, phenol resin, xylene resin, maleic acid resin, nitrocellulose, ethyl cellulose, acetyl butyl Examples include cellulose resins such as cellulose and ethyloxyethyl cellulose, rubber resins such as chlorinated rubber and cyclized rubber, petroleum resins, and natural resins such as rosin and casein.

The heat-generating ink for forming the heat-generating ink layer may further contain light stabilizers such as pigments, fillers, stabilizers, plasticizers, antioxidants, and ultraviolet absorbers, as long as the heat-generating properties are not impaired. , a dispersant, a thickener, a desiccant, a lubricant, a crosslinking agent, and other optional additives can be added.

As the solvent contained in the heat-generating ink, solvents used in ordinary pigment inks can be used, such as methanol, ethanol, normal propanol, isopropanol, alcohol solvents such as propylene glycol monomethyl ether, acetone, methyl ethyl ketone, and methyl. Ketone solvents such as isobutyl ketone, ester solvents such as methyl acetate, ethyl acetate, and normal propyl acetate, aliphatic hydrocarbon solvents such as normal hexane, normal heptane, and normal octane, and fats such as cyclohexane, methylcyclohexane, and cycloheptane. Examples include cyclic hydrocarbon solvents, aromatic solvents such as toluene and xylene, and mineral spirits. These may be used alone or in combination of two or more.

The heat-generating ink layer 36 can be formed by a known printing method such as a gravure printing method, an offset printing method, a letterpress printing method, or a silk screen printing method using the above-described heat-generating ink.

Note that if the adhesion between the heat generating ink layer 36 and the base material layer 31 is not good, an anchor coat layer may be provided between the heat generating ink layer 36 and the base material 31.

[Sealant layer]
As described above, the sealant layer 34 is provided for bonding and sealing the two laminated films 30 by overlapping the two laminated films 30 and heat-sealing the areas near the opposing edges. Further, the sealant layer 34 is a layer of the laminated film 30 that is located closest to the accommodation space side (inside) when the pouch 1 is made into a bag.
In addition to heat-sealability, the sealant layer 34 is required to have heat resistance when heated in a microwave oven, impact resistance during transportation or dropping, and the like.

As the sealant layer 34, a film containing a polyolefin resin such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-propylene random copolymer, ethylene-propylene block copolymer, etc. can be employed. Specifically, as the sealant layer 34, it is preferable to use low density polyethylene (LDPE) such as unoriented polypropylene (CPP) or linear low density polyethylene (LLDPE). By using low density polyethylene (LDPE), impact resistance during transportation can be improved. Moreover, the sealant layer 34 may further contain an olefin elastomer from the viewpoint of impact resistance and puncture resistance.
The sealant layer 34 may be composed of a single layer or a multilayer structure consisting of a plurality of layers. The material and layer configuration of each layer can be changed as appropriate depending on required specifications such as impact resistance, heat sealability, and easy peelability.

The thickness of the sealant layer 34 is preferably in the range of 40 μm or more and 200 μm or less.
In this case, the pouch 1 has excellent impact resistance against drops that may occur during the distribution process, and also has excellent handling properties such as ease of filling and taking out the contents.

[Picture layer]
In this embodiment, a pattern layer 32 including a pattern is laminated on the surface of the base material layer 31 facing inside the container. That is, the pattern layer 32 is provided between the base material layer 31 and the sealant layer 34.
As shown in FIG. 2, the pattern layer 32 is preferably provided closer to the sealant layer 34 than the heat generating ink layer 36 from the viewpoint of making the heat generating ink layer visible and ensuring safety during handling. Alternatively, in consideration of the visibility of the pattern layer and the efficiency of transferring heat generated in the heat-generating ink layer to the sealant layer, a pattern layer is formed on the base material layer, and a heat-generating ink layer is formed on the pattern layer. It is also possible to adopt a configuration in which the following is provided.
Further, as a modification of FIG. 2, a structure may be adopted in which the heat-generating ink layer and the pattern layer are not laminated. In this case, when the laminated film is viewed from above, the heat generating ink layer and the pattern layer may be formed adjacent to each other, or the heat generating ink layer and the pattern layer may be provided apart from each other.

The term "picture" refers to a recording target in various forms that can be recorded or printed on the base material layer 31, and includes a wide range of figures, characters, patterns, patterns, symbols, designs, marks, etc., without being particularly limited. In the laminated film 30 used in the pouch 1 intended to contain food, a picture of the contents and characters indicating information such as the product name, expiration date, manufacturing date, manufacturing number, etc. of the contents are used as the pattern. It will be done.
The pattern layer 32 may be formed on the entire surface of the base layer 31 or may be formed partially. The pattern layer 32 is laminated on the base material layer 31 according to the specifications of the product, and the pattern layer 32 does not need to be provided on the base material layer 31.

In this embodiment, the pattern layer 32 is formed on the inner surface of the base layer 31. With this configuration, the pattern layer 32 has excellent abrasion resistance, so it can effectively prevent disappearance due to rubbing, etc., and can also effectively prevent the pattern from being tampered with.

The pattern layer mainly contains a colorant and a binder resin.
Coloring agents include white pigments such as titanium dioxide, barium sulfate, magnesium oxide, calcium carbonate, zinc oxide, and lead white; black pigments such as carbon black, titanium black, and iron black; yellow lead, titanium yellow, Bengara, and cadmium. Chromatic inorganic pigments such as red, ultramarine and cobalt blue; chromatic organic pigments such as quinacridone red, isoindolinone yellow and phthalocyanine blue; glittering materials such as pearl pigments, metal particles and metal scales; dyes, etc. One or more of these can be used.

The pattern layer can be formed, for example, on the base material layer by a known printing method such as a gravure printing method, an offset printing method, a letterpress printing method, or a silk screen printing method using a known ink. The pattern layer forming ink usually contains a vehicle consisting of a binder resin and a solvent as a main component.

Examples of binder resins include polyolefin resins such as polyethylene resins and chlorinated polypropylene resins, poly(meth)acrylic resins, polyvinyl chloride resins, polyvinyl acetate resins, and vinyl chloride-vinyl acetate copolymers. , polystyrene resin, styrene-butadiene copolymer, vinylidene fluoride resin, polyvinyl alcohol resin, polyvinyl acetal resin, polyvinyl butyral resin, polybutadiene resin, polyester resin, polyamide resin, alkyd resin, epoxy resins, unsaturated polyester resins, thermosetting poly(meth)acrylic resins, melamine resins, urea resins, polyurethane resins, phenolic resins, xylene resins, maleic acid resins, nitrocellulose, ethylcellulose, acetyl Examples include cellulose resins such as butyl cellulose and ethyloxyethyl cellulose, rubber resins such as chlorinated rubber and cyclized rubber, petroleum resins, and natural resins such as rosin and casein.

The pattern layer forming ink further contains, as necessary, fillers, stabilizers, plasticizers, antioxidants, light stabilizers such as ultraviolet absorbers, dispersants, thickeners, drying agents, lubricants, Any additives such as antistatic agents and crosslinking agents can be added.

As the solvent contained in the ink of the pattern layer, solvents used in ordinary pigment inks can be used, such as methanol, ethanol, normal propanol, isopropanol, alcohol solvents such as propylene glycol monomethyl ether, acetone and methyl ethyl ketone. , ketone solvents such as methyl isobutyl ketone, ester solvents such as methyl acetate, ethyl acetate, n-propyl acetate, aliphatic hydrocarbon solvents such as n-hexane, n-heptane, and n-octane, cyclohexane, methylcyclohexane, cycloheptane, etc. Examples include alicyclic hydrocarbon solvents, aromatic solvents such as toluene and xylene, and mineral spirits. These may be used alone or in combination of two or more.

The content of the coloring agent in the pattern layer is not particularly limited, but it is preferably 5 to 70% by mass, more preferably 15 to 65% by mass, and 20% by mass of the total solid content of the pattern layer. More preferably, the amount is 60% by mass.

The thickness of the pattern layer is not particularly limited, and is preferably about 1.0 to 5.0 μm, more preferably 1.0 to 3.0 μm.

[Other layers]
The laminated film 30 of the present invention may have an intermediate base layer 33 between the base layer 31 and the sealant layer 34. The intermediate base material layer 33 is provided to supplement various functions required of a microwave pouch.
Specifically, in order to make the pouch suitable for containing food as the content, the intermediate base material layer 33 is made of water vapor so that the content can be preserved while preventing deterioration such as oxidation of the content. The material may have gas barrier properties that prevent the permeation of gases such as gas and oxygen gas. Furthermore, the pouch 1 in the form of a standing pouch is displayed in a freestanding state on a product shelf in a sales floor. For this reason, the intermediate base material layer 33 may have bending resistance and impact resistance so that it can sufficiently withstand the impact when the pouch 1 falls from a product shelf. In addition, the intermediate base material layer 33 may have a function of sufficiently increasing concealment so that the contents of the pouch 1 are not visible, in order to increase the consumer's desire to purchase.

As the intermediate base material layer 33 having such a function, for example, polyolefin such as polyethylene terephthalate, polyamide, polyethylene, polypropylene, nylon, polyvinyl chloride, polycarbonate, polyvinyl alcohol, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, etc. A film of saponified polymer or the like can be used. As the above film, a film coated with an inorganic material such as silicon oxide or aluminum oxide, or a film coated with an ethylene-vinyl alcohol copolymer may be used.
The intermediate base material layer 33 may be composed of one type of films listed above, or may be used in combination of two or more types.

As shown in FIG. 2, in this embodiment, a bonding layer 35 is interposed between the base material layer 31 and the intermediate base material layer 33 and between the intermediate base material layer 33 and the sealant layer 34. As this bonding layer 35, an adhesive commonly used in the dry lamination method, which is known per se, can be used. For example, polyvinyl acetate adhesive, polyacrylate adhesive, cyanoacrylate adhesive, ethylene copolymer adhesive, cellulose adhesive, polyester adhesive, polyamide adhesive, amino resin adhesive , epoxy adhesive, polyurethane adhesive, etc. can be used.

Examples of the laminated film applicable to this embodiment include films having the following configurations.
(1) Transparent vapor-deposited PET/heat-generating ink layer/picture layer/sealant layer/ONy/sealant layer/CPP
(2) ONy/heat-generating ink layer/picture layer/sealant layer/transparent vapor-deposited PET/sealant layer/CPP
(3) Transparent vapor-deposited PET/heat-generating ink layer/picture layer/PET/sealant layer/CPP
(4) Transparent vapor-deposited PET/heat-generating ink layer/picture layer/sealant layer/PET/sealant layer/PET/sealant layer/CPP
(5) Transparent vapor-deposited PET/Picture layer/Heat-generating ink layer/Sealant layer/ONy/Sealant layer/CPP
(6) ONy/Picture layer/Heat-generating ink layer/Sealant layer/Transparent vapor deposited PET/Sealant layer/CPP
(7) Transparent vapor-deposited PET/pattern layer/heat-generating ink layer/PET/sealant layer/CPP
(8) Transparent vapor-deposited PET/design layer/heat-generating ink layer/sealant layer/PET/sealant layer/PET/sealant layer/CPP

[Seal part]
The sealed portion 50 is formed by heat-sealing the vicinity of the periphery of the sheet 11 made of the laminated film 30. When viewed from the direction shown in FIG. 1, the seal portion 50 surrounds the housing space 2 and seals the housing space 2.

Below, the form of the seal portion in the pouch of the present invention will be explained by giving an example.
<First embodiment>
In the pouch according to the first embodiment, as shown in FIG. . On the other hand, the inner edge 50b of the seal portion 50 extends in a circumferential manner while being spaced apart from the outer edge 50a.

The seal portion 50 includes a first side seal portion 51 and a second side seal portion 52 located opposite to each other in the horizontal direction d1, and an upper seal located opposite to each other in the vertical direction d2 perpendicular to the horizontal direction d1. portion 53 and a lower seal portion 54. In other words, the lateral direction d1 is the direction in which the first side seal portion 51 and the second side seal portion 52 are arranged, and the up-down direction d2 is a direction perpendicular to the arrangement direction.

Each side seal portion 51, 52 is formed by heat-sealing the vicinity of the side edge 13 of two sheets 11. The upper seal portion 53 is formed by heat sealing the vicinity of the upper edge 12 of the sheet 11. The lower seal portion 54 is formed by heat sealing the vicinity of the lower edge 14 of the sheet 11.

The unsealed portion 60 is an area near the side edge 13 of the sheet where the two sheets 11 are not heat-sealed. The unsealed portion 60 is isolated from the accommodation space 2 by a corresponding side seal portion (first side seal portion 51 in FIG. 1).
The unsealed portion 60 is provided in order to communicate with the accommodation space 2 and release the steam inside the pouch 1 to the outside when the pressure inside the pouch 1 increases due to steam generated by heating with a microwave oven. . The unsealed portion 60 reaches the side edge 13 of the sheet 11 (laminated film 30) and is open. That is, the unsealed portion 60 forms an opening 61 in the side edge 13 of the sheet 11 . As shown in FIG. 1, the unsealed portion 60 separates the first side sealed portion 51 into an upper sealed portion 56 and a lower sealed portion 57. The unsealed portion 60 projects further toward the accommodation space 2 than the upper sealed portion 56 and the lower sealed portion 57. As a result, an overhanging seal portion 55 is formed in the side seal portion.

The unsealed portion 70 is provided to compensate for the unsealed portion 60 forming an opening 61 in the side edge 13 of the sheet 11 when the pouch 1 is manufactured. That is, the unsealed portion 70 is provided to improve the manufacturing efficiency of the pouch 1. The unsealed portion 70 reaches the side edge 13 of the sheet 11 and is open. That is, the unsealed portion 70 forms an opening 71 in the side edge 13 of the sheet 11 . Note that the unsealed portion 70 does not necessarily have to be provided.

FIG. 3 is an enlarged view of the first side seal portion near the unsealed portion of the pouch according to the first embodiment. As shown in FIG. 3, the first side seal portion 51 surrounds an upper seal portion 56 and a lower seal portion 57 located on both sides of the unsealed portion 60, and at least a portion of the unsealed portion 60. and an overhanging seal part 55 that is connected to the upper seal part 56 and the lower seal part 57 and that extends further toward the accommodation space 2 than the upper seal part 56 and the lower seal part 57. . The upper seal portion 56 extends from around the unsealed portion 60 along the vertical direction d2 and is connected to the upper seal portion 53. On the other hand, the lower seal portion 57 extends from around the unsealed portion 60 along the vertical direction d2 and is connected to the lower seal portion 54.

In FIGS. 1 and 3, the width of the upper seal portion 56 (width in the direction from the accommodation space 2 to the outside of the pouch) is made larger than the width of the lower seal portion 57. This is a configuration that takes into account ease of handling when opening the package through the notch described later after heating. However, the present invention is not limited thereto; for example, the width of the upper seal portion 56 may be the same as the width of the lower seal portion 57.

As shown in FIG. 3, the overhanging seal portion 55 includes an upper overhang region 55a that extends from the upper seal portion 56 along the lateral direction d1, and an upper overhang region 55a that extends from the lower seal portion 57 along the lateral direction d1. It includes a lower overhang area 55b and a middle overhang area 55c interposed between the upper overhang area 55a and the lower overhang area 55b. In the example shown in FIG. 3, the middle projecting region 55c extends along the vertical direction d2 at a position between the unsealed portion 60 and the accommodation space 2. In the example shown in FIG. The middle overhanging region 55c is connected to the upper overhanging region 55a through the upper corner region 55d, and is connected to the lower overhanging region 55b through the lower corner region 55e.

The upper corner region 55d protrudes toward the accommodation space 2 at a position closer to the upper seal portion 56 than the lower seal portion 57, and the lower corner region 55e is closer to the lower seal portion 57 than the upper seal portion 56. It protrudes toward the accommodation space 2 at a position close to . In the example shown in FIG. 3, the upper corner region 55d and the lower corner region 55e have fan-shaped shapes with a central angle of 90° when viewed from above. That is, the shape of the overhanging seal portion 55 is a rectangle with a corner on the side of the accommodation space 2 curved into a fan shape when viewed from above.
Note that a plan view refers to viewing the pouch 1 from a direction perpendicular to both the horizontal direction d1 and the vertical direction d2 in the figure.

In the first embodiment, the size of the overhanging seal portion (the lengths of the upper overhang region 55a, the lower overhang region 55b, and the middle overhang region 55c) is not particularly limited. However, the size of the protruding seal portion should be determined based on the volume of the storage space 2, ensuring that it does not become an obstacle when filling the contents, and the size of the communication area with the unsealed portion when steaming. Set as appropriate.

As shown in FIG. 3, the edge 62 of the unsealed portion 60 includes a first edge 63 and a second edge 64 extending from around the opening 61 toward the accommodation space 2, and a tip of the first edge 63. and a third edge 65 extending between the tip of the second edge 64 and the tip of the second edge 64 . In the illustrated example, the first edge 63 is arranged on the upper edge 12 side of the sheet 11, and the second edge 64 is arranged on the lower edge 14 side of the sheet 11.

As shown in FIG. 3, the first edge 63 and second edge 64 of the unsealed portion 60 extend linearly in the lateral direction d1. In the example of FIG. 3, the length of the first edge 63 is equal to the length of the second edge 64. Therefore, when the third edge 65 extends linearly between the tip of the first edge 63 and the tip of the second edge 64, the third edge 65 extends parallel to the up-down direction d2, and The first edge 63 and the second edge 64 are perpendicular to each other. In this case, the unsealed portion 60 has a rectangular shape.

As shown in FIGS. 1 and 3, a notch 7 is formed in the upper seal portion 56, which can serve as a starting point for opening. The position where the notch 7 is provided is the planned opening position when the pouch 1 is opened to take out the contents stored in the storage space 2. Notch 7 passes through sheet 11. The notch 7 may be a cut formed in the upper seal portion 56, or may be a cutout having a predetermined width. The formation of the notch 7 in the upper seal portion 56 allows the pouch 1 to be easily opened from the notch 7.
The notch 7 is preferably provided in at least one of the first side seal part 51 and the second side seal part 52. For example, as shown in FIG. 1, the notch 7 may be provided not only in the first side seal part 51 but also in the second side seal part 52. In this case, the positions where the two notches 7 are formed are preferably at substantially the same height in the vertical direction d2 of the pouch 1.
Note that the notch 7 may be formed in the lower seal portion 57.

The planned opening position is not limited to the notch 7, and various known easy-opening means can be provided. Another example of easy-opening means is to provide a plurality of small holes.

In this embodiment, the heat-generating ink layer is provided over the entire overhanging seal portion 55, and in a region 57a of the lower seal portion 57 and a region 56a of the upper seal portion 56 to which the overhang seal portion 55 is connected. In FIG. 3, the lateral lengths d1 of regions 56a and 57a correspond to the widths of upper sealing portion 56 and lower sealing portion 57, respectively.

As a modification of the first embodiment, the heat generating ink layer may be provided on either the lower seal portion 57 or the upper seal portion 56.
Furthermore, the lengths in the lateral direction d1 of the region 56a and the region 57a may be smaller than the width of the upper seal portion 56 and the width of the lower seal portion 57, respectively.

Note that it is preferable that the heat-generating ink layer is not substantially provided in the unsealed portion. "Substantially not provided" means that the heat-generating ink layer is allowed to be included even in areas that are unsealed due to manufacturing reasons such as misprinting or sealing of the heat-generating ink layer. Specifically, the area of the heat-generating ink layer included in the region that becomes the unsealed portion is 5% or less of the area of the entire unsealed portion.

In this embodiment, the heat-generating ink layer is formed over the entire protruding seal portion 55 as described above. Therefore, when heating in a microwave oven, the overhanging seal portion 55 in the area where the heat generating ink layer is provided is heated by the conductive polymer or conductive particles in the heat generating ink. As a result, the bonding force of the sheet 11 at the protruding seal portion 55 decreases relatively early after heating in the microwave oven.
The accommodation space 2 that expands with heating can be considered to expand from near the center of the pouch 1. Therefore, the pressure applied to the seal portion 50 depends on the distance from the center of the pouch 1, and the closer the seal portion is from the center of the pouch 1, the stronger the load from the steam is applied to the seal portion. That is, the overhanging seal portion 55 is subjected to a higher load than other seal portions. When the pressure in the housing space 2 increases due to microwave heating, the sheet 11 peels off across the overhanging seal portion 55 where the bonding force has weakened. Then, the steam in the accommodation space 2 is released to the outside of the pouch 1 from the peeled portion through the unsealed portion 60.
In this way, the pouch of this embodiment allows the steam in the accommodation space 2 to reliably escape from the protruding seal portion 55 to the outside. The pouch of this embodiment can cause steam to escape even when containing contents that generate a small amount of steam.

In this embodiment, a heat generating ink layer is provided in at least one of the region 56a and the region 57a so as to be continuous with the heat generating ink layer of the overhanging seal portion 55. By doing this, the heat generated in the heat generating ink layer of the lower seal portion 57 and the upper seal portion 56 is transmitted to the overhanging seal portion 55, and the peeling of the sheet 11 at the overhang seal portion 55 is promoted more efficiently. be able to. In particular, when heating using a flat table microwave oven, if the pouch 1 is heated in an upright position, the microwaves reach the exothermic ink layer formed on the overhanging seal portion 55 due to the moisture contained in the contents. On the other hand, microwaves are not inhibited by the contents in the lower seal portion 57 and the upper seal portion 56. The pouch of this embodiment has the advantage that the overhanging seal portion 55 can be heated through the heat generating ink layer of the lower seal portion 57 and the upper seal portion 56, and the peeling of the sheet 11 at the overhang seal portion 55 can proceed. It's advantageous.
In this way, the pouch 1 of this embodiment can reliably cause steam to escape regardless of the heating method of the microwave oven used.

Further, even when heating with a turntable microwave oven, by providing a heat generating ink layer on at least a portion of the lower seal portion 57 and the upper seal portion 56, a sufficient area of the heat generating ink layer can be secured. The sheet 11 can be efficiently peeled off at the protruding seal portion 55.

When heat sealing is performed under the same conditions, the bonding force at any one point within the seal portion 50 is designed to be equal to the bonding force at another point. However, the bonding force may be distributed within the seal portion 50 during heat sealing. If the heat-generating ink layer is not provided, when the pressure in the accommodation space increases due to heating in a microwave oven, there is a risk that seal regression may occur in the seal portions other than the overhanging seal portions where the bonding force is weak. As in this embodiment, by forming a heat-generating ink layer on the overhanging seal portion 55, it is possible to reduce the bonding force of the sheet 11 at the overhang seal portion 55, thereby preventing seal regression at other seal portions. It also has the effect of being preventive.
Since the seal retreat can be prevented in this way, in the pouch of this embodiment, the width of the seal portion 50 can be made smaller than that of the conventional pouch. Specifically, the width of the seal portion 50 can be approximately 4 mm. As a result, the bag can be made smaller. Alternatively, the volume of the storage space can be increased by keeping the size of the outer circumference the same.

The amount of heat generated by the heat generating ink layer depends on the content of the material that absorbs microwaves in the applied heat generating ink. That is, the amount of heat generated depends particularly on the coating area when the pouch 1 is viewed from above. The coating area is appropriately set in consideration of the releasability of the overhanging seal portion, manufacturing cost, etc.
For example, if the area of the region 56a and the region 57a is too small, the amount of heat generated in the region 56a and the region 57a is small, and therefore the overhanging seal portion 55 cannot be sufficiently heated. Peeling may not occur. Even if the areas of the regions 56a and 57a are made too large, the amount of coating increases and the manufacturing cost increases. Further, if the area of the region 56a and the region 57a is too large, the region may be excessively heated by the heat generated by the microwave oven, and the sheet may be damaged by heat.
When the pouch is viewed from above, the coating area (in the case of FIG. 3, the total coating area of region 56a and region 57a) is preferably 0.3 cm ² to 2.5 cm ² , and 0.5 cm ² to 1.5 cm 2 . More preferably, it is 5 cm ² . In particular, when heating is performed using a flat table microwave oven, the microwaves propagate upward from below the pouch. For this reason, the coating area in the region 57a closer to the flat table is preferably 0.2 cm ² to 1.5 cm ² , more preferably 0.3 cm ² to 1.0 cm ² .

The shape (pattern) of the heat-generating ink layer formed on the first side seal portion 51 can be changed as long as it is continuous with the overhanging seal portion 55 and can ensure an area where peeling occurs in the overhang seal portion 55. Not particularly limited.
For example, the region 56a and the region 57a may be formed over the entire width direction of the upper seal portion 56 and the lower seal portion 57, respectively, as shown in FIG. The portion may not reach the side edge 13. Further, the ends of the region 56a and the region 57a do not need to reach the edges (numerals 63 and 64 in FIG. 3) of the unsealed portion 60.

Note that if the width of the upper seal portion 56 and the lower seal portion 57 in the length direction (direction that coincides with the vertical direction d2) is too large, the region 56a and the region 57a will overwhelm the amount of heat generated in the region 56a and the region 57a. The efficiency of heat transfer to the exit seal portion 55 decreases. From this point of view as well, it is preferable that the coating area of the heat generating ink layer in the regions 56a and 57a falls within the above range.

Furthermore, when the width of the protruding seal portion 55 (width in the direction from the storage space 2 side to the unsealed portion 60) is wide, the heat generated in the heat generating ink layer of the upper seal portion 56 and the lower seal portion 57 is They will be dispersed within the overhanging seal portion 55. In order to more efficiently cause peeling in the overhanging seal portion 55, the widths of the upper overhang region 55a, the lower overhang region 55b, and the middle overhang region 55c are preferably 2 mm to 8 mm, respectively. , more preferably 3 mm to 5 mm.

Note that the heat-generating ink layer may be applied solidly within the area where it is formed, or may be applied in a pattern such as a grid.

4 and 5 are modified examples of the pouch according to the first embodiment, and are enlarged views of the first side seal portion near the unsealed portion. In FIGS. 4 and 5, components common to those in FIG. 3 are designated by the same reference numerals.

In FIG. 4, the heat generating ink layer is provided in the middle overhanging region 55c, the upper corner region 55d, the upper overhanging region 55a, and the upper seal portion 56. In FIG. 5, the heat generating ink layer is provided on the upper overhang region 55a and the upper seal portion 56. In FIG. That is, FIGS. 4 and 5 are examples in which a heat-generating ink layer is provided on a part of the protruding seal portion 55.

As long as the heat generating ink layer formed on the overhanging seal portion is connected to the heat generating ink layer formed on the upper seal portion 56 and/or the lower seal portion 57, the application area is not limited to those shown in FIGS. 4 and 5. For example, a configuration may be adopted in which a heat-generating ink layer is provided on the lower overhanging region 55b and the lower seal portion 57, or a heat-generating ink layer is provided on the middle overhanging region 55c, the lower corner region 55e, the lower overhanging region 55b, and the lower sealing portion 57. A structure in which layers are provided may also be used.

In addition, in the upper overhanging region 55a, the lower overhanging region 55b, and the middle overhanging region 55c, the heat-generating ink layer extends in the entire length direction (direction perpendicular to the width direction) as illustrated in FIGS. It is not necessary to provide the heat-generating ink layer over the entire length of the regions 55a, 55b, and 55c, as long as the layer is connected to the upper seal portion 56 or the lower seal portion 57. good.

By providing a heat-generating ink layer on a portion of the overhanging seal portion, it is possible to limit the locations where the sheet peels off when heated in a microwave oven. For this reason, for example, when the pouch is taken out of the refrigerator after cooking, it is possible to prevent the contents from leaking from the peeled portion. In addition, even after the sheet is peeled off by heating, the shape of the overhanging seal portion is maintained and the appearance can be maintained.

In particular, it is preferable that the exothermic ink layer be formed in a region of the overhanging seal portion 55 that is close to the upper seal portion 57. Specific examples of such a configuration include, as shown in FIG. 5, a configuration in which a heat generating ink layer is provided only in the upper overhang area 55a of the overhang seal portion 55, and a configuration in which a heat generating ink layer is provided only in the upper overhang area 55a and the upper corner area 55d. This is a configuration in which an ink layer is provided. With this structure, even if the contents boil due to heating, the lower side of the protruding seal portion close to the contents remains sealed, preventing the contents from spewing out to the outside of the pouch 1. It can be prevented.

<Second embodiment>
6 to 8 are enlarged views of the first side seal portion near the unsealed portion of the pouch according to the second embodiment. In FIGS. 6 to 8, components common to those in FIG. 3 are given the same reference numerals. Further, common components in FIGS. 6 to 8 are given the same reference numerals.

The third embodiment is the same as the first embodiment except for the shapes of the protruding sealed portion and the unsealed portion.
The overhanging seal portions 155 and 156 in FIGS. 6 and 7 are trapezoidal shapes in which two interior angles on the upper seal portion 56 and lower seal portion 57 sides are substantially right angles when viewed from above. The upper corner region 155d and lower corner region 155e of the protruding seal portions 155, 156 on the accommodation space 2 side are fan-shaped when viewed from above. FIG. 6 shows an example in which the length of the upper overhanging region 155a is shorter than the length of the lower overhanging region 155b. FIG. 7 shows an example in which the length of the upper overhanging region 155a is longer than the length of the lower overhanging region 155b.
The shape of the overhanging seal portion 157 in FIG. 8 is an equiangular trapezoid when viewed from above.

6 to 8 are examples, and if the overhanging seal portion is trapezoidal, the size of the overhang seal portion (the lengths of the upper overhang region 155a, the lower overhang region 155b, and the middle overhang region 155c, The angles of the upper corner region 155d and the lower corner region 155e are not particularly limited. However, the size of the protruding seal portion should be determined based on the volume of the storage space 2, ensuring that it does not become an obstacle when filling the contents, and the size of the communication area with the unsealed portion when steaming. Set as appropriate.

Note that in FIGS. 6 to 8, the width of the upper seal portion 56 and the width of the lower seal portion 57 are shown to be equal, but the width is not limited to this. As described in the first embodiment, the width of the upper seal portion 56 can be made larger than the width of the lower seal portion 57 in consideration of ease of handling after heating in a microwave oven.

In the second embodiment, the shape of the unsealed portion 160 is not particularly limited. 6-8, a trapezoidal unsealed portion 160 is illustrated. As shown in FIGS. 6 to 8, the unsealed portion 160 may substantially match the shape of the overhanging seal portion, or may be different from the shape of the overhang seal portion.

Taking FIG. 6 as an example, when the unsealed portion is a trapezoid with two interior angles that are substantially right angles, the edge 162 of the unsealed portion 160 has a shape extending from around the opening 61 toward the accommodation space 2 side. The third edge 165 includes a first edge 163, a second edge 164, and a third edge 165 extending between the tip of the first edge 163 and the tip of the second edge 164. The first edge 163 and the second edge 164 extend linearly in the lateral direction d1, and the length of the first edge 163 is shorter than the length of the second edge 164. The third edge 165 is an oblique side extending diagonally with respect to the up-down direction d2.

To explain using FIG. 8 as an example, when the unsealed portion has an equiangular trapezoidal shape, the edge 162 of the unsealed portion 160 includes a first edge 163 and a first edge 163 extending toward the accommodation space 2 from around the opening 61. It includes two edges 164 and a third edge 165 extending between the tips of the first edge 163 and the second edge 164. The third edge 165 extends parallel to the side edge 13 of the first side seal portion 51 and is shorter than the length of the opening 61 .

In the second embodiment, the region where the heat generating ink layer is formed is the same as in the first embodiment. That is, the heat-generating ink layer is formed on at least one of at least a portion of the lower seal portion, at least a portion of the upper seal portion, and at least a portion of the overhanging seal portion. The exothermic ink layer on the overhanging seal portion is continuous with the exothermic ink layer formed on at least one of the upper seal portion and the lower seal portion. 6 to 8 are examples for explaining the invention, and as long as the coating is performed as described above, the coating area is not limited to those shown in the figures.

In FIG. 6, a heat-generating ink layer is provided in the lower overhang region 155b of the overhang seal portion 155, the lower corner region 155e, and the region 57a of the lower seal portion 57.
When the pouch having the overhanging seal portion shown in FIG. 6 is heated in a microwave oven, the bonding force of the sheets decreases in the lower overhang region 155b and the lower corner region 155e. When a load is applied to the overhanging seal portion 155 due to an increase in the pressure in the accommodation space 2, separation occurs between the sheets in the lower overhang region 155b and the lower corner region 155e, and the steam within the accommodation space 2 is released to the outside of the pouch. As a result, seal retreat at other seal portions can be prevented. Further, even when storing contents that generate a small amount of steam, the steam in the storage space 2 can be released to the outside from the protruding seal portion 155.

In FIG. 7, a heat-generating ink layer is provided in the upper overhang region 155a of the overhang seal portion 156 and the region 56a of the upper seal portion 56. In FIG.
When the pouch having the overhanging seal portion shown in FIG. 7 is heated in a microwave oven, the bonding force of the sheet 11 is reduced in the upper overhang region 155a. When a load is applied to the overhanging seal portion 156 due to an increase in the pressure in the accommodation space 2, separation between the sheets occurs in the upper overhang region 155a, and steam within the accommodation space 2 is released to the outside of the pouch. As a result, seal retreat at other seal portions can be prevented. Further, even when storing contents that generate a small amount of steam, the steam in the storage space 2 can be released to the outside from the protruding seal portion 155.
In particular, if the exothermic ink layer is formed in a region of the overhanging seal portion 156 that is close to the upper seal portion 57 (in FIG. 7, the upper overhang region 155a), the contents will be transferred to the outside of the pouch when heated in a microwave oven. It can also prevent objects from spewing out.

In FIG. 8, a heat-generating ink layer is provided in the upper overhang region 155a of the overhang seal portion 157, the upper corner region 155d, the middle overhang region 155c, and the region 56a of the upper seal portion 56. In FIG. 8, the heat generating ink layer is provided in a part of the middle overhanging area 155c so as not to contact the lower corner area 155e.
When the pouch having the overhanging seal portion shown in FIG. 8 is heated in a microwave oven, the bonding force of the sheet 11 is reduced in the upper overhang region 155a, the upper corner region 155d, and the middle overhang region 155c. When a load is applied to the overhanging seal portion 157 due to an increase in the pressure in the storage space 2, separation occurs between the sheets from the upper overhang region 155a to the middle overhang region 155c, and the steam inside the storage space 2 is released to the outside of the pouch. released. As a result, seal retreat at other seal portions can be prevented. Further, even when storing contents that generate a small amount of steam, the steam in the storage space 2 can be released to the outside from the protruding seal portion 155.

<Third embodiment>
9 to 11 are enlarged views of the first side seal portion near the unsealed portion of the pouch according to the third embodiment. In FIGS. 9 to 11, components common to those in FIG. 3 are given the same reference numerals. Further, common components in FIGS. 9 to 11 are given the same reference numerals.

The third embodiment is the same as the first embodiment except for the shapes of the protruding sealed portion and the unsealed portion.
The overhanging seal portion 255 in FIG. 9 is a right triangle whose hypotenuse is located below the corner region when viewed from above. The overhanging seal portion 256 in FIG. 10 is a right triangle whose hypotenuse is located above the corner region when viewed from above. The overhanging seal portion 257 in FIG. 11 has an equilateral triangle shape when viewed from above.

The overhanging seal portions 255, 256, 257 of the third embodiment include an upper overhang region 255a that extends from the upper seal portion 56 toward the accommodation space 2 on the upper seal portion 53 side, and a lower overhang region 255a on the lower seal portion 54 side. It includes a lower overhanging region 255b extending from the seal portion 57 toward the accommodation space 2, and a corner region 255c connecting the upper overhanging region 255a and the lower overhanging region 255b. The corner region 255c has a sector-shaped shape.
9 to 11 are illustrative, and if the overhanging seal portion in the third embodiment is triangular, the size and shape of the overhang seal portion (each length of the upper overhang region 255a and the lower overhang region 255b) , the angle of the corner region 255c) are not particularly limited. However, the size of the protruding seal portion should be determined based on the volume of the storage space 2, ensuring that it does not become an obstacle when filling the contents, and the size of the communication area with the unsealed portion when steaming. Set as appropriate.

In the fourth embodiment, the shape of the unsealed portion 260 is not particularly limited. 9-11, a triangular unsealed portion 260 is illustrated. As shown in FIGS. 9 to 11, the unsealed portion 260 may substantially match the shape of the overhanging sealed portion, or may be different from the shape of the overhanging sealed portion.

Taking FIG. 9 as an example, when the unsealed portion is triangular, the edge 262 of the unsealed portion 260 is a first edge 263 and a second edge extending from around the opening 61 toward the accommodation space 2. 264, and the ends of the first edge 263 and the second edge 264 are connected to each other on the accommodation space 2 side.

In the third embodiment, the region where the heat generating ink layer is formed is the same as in the first embodiment. That is, the heat-generating ink layer is formed on at least one of at least a portion of the lower seal portion, at least a portion of the upper seal portion, and at least a portion of the overhanging seal portion. The exothermic ink layer on the overhanging seal portion is continuous with the exothermic ink layer formed on at least one of the upper seal portion and the lower seal portion. 9 to 11 are examples for explaining the invention, and the application area is not limited to the figures as long as it is applied as described above.

In FIG. 9, a heat generating ink layer is provided on the upper overhang region 255a of the overhang seal portion 255 and the region 56a of the upper seal portion 56. Note that a heat-generating ink layer may be formed in the corner region 255c continuous with the upper overhang region 255a.
When the pouch having the overhanging seal portion shown in FIG. 9 is heated in a microwave oven, the bonding force of the sheet 11 is reduced in the upper overhang region 255a. When a load is applied to the overhanging seal portion 255 due to an increase in the pressure in the accommodation space 2, separation between the sheets occurs in the upper overhang region 255a, and steam within the accommodation space 2 is released to the outside of the pouch. As a result, seal retreat at other seal portions can be prevented. Further, even when storing contents that generate a small amount of steam, it is possible to release the steam in the storage space 2 to the outside from the protruding seal portion 255.

In addition, as shown in FIG. 9, if the heat-generating ink layer is formed in the upper overhanging region 255a of the overhanging seal portion 255 that is close to the upper seal portion 57, the contents will be transferred to the outside of the pouch when heated in a microwave oven. It can also prevent objects from spewing out.

In FIG. 10, a heat-generating ink layer is provided in the lower overhang region 255b of the overhang seal portion 256 and the region 57a of the lower seal portion 57. Note that a heat-generating ink layer may be formed in the corner region 255c continuously from the lower overhang region 255b.
When the pouch having the overhanging seal portion shown in FIG. 10 is heated in a microwave oven, the bonding force of the sheet 11 decreases in the lower overhang region 255b. When a load is applied to the overhanging seal portion 256 due to an increase in the pressure in the accommodation space 2, separation between the sheets occurs in the lower overhang region 255b, and steam within the accommodation space 2 is released to the outside of the pouch. As a result, seal retreat at other seal portions can be prevented. Moreover, even when the pouch of this embodiment accommodates contents that generate a small amount of steam, it is possible to release the steam in the storage space 2 to the outside from the protruding seal portion 255.

In FIG. 11, a heat-generating ink layer is provided on the upper overhang region 255a of the overhang seal portion 257 and the region 56a of the upper seal portion 56. Note that a heat-generating ink layer may be formed in the corner region 255c continuous with the upper overhang region 255a.

In the pouch of this embodiment as well, by forming a heat-generating ink layer on the overhanging seal portion 255, it is possible to reduce the bonding force of the sheet 11 at the overhang seal portion 255 during heating in a microwave oven. Seal regression can be prevented. Further, even when storing contents that generate a small amount of steam, it is possible to release the steam in the storage space 2 to the outside from the protruding seal portion 255.

Furthermore, as shown in FIG. 11, by forming a heat-generating ink layer on the upper overhanging region 255a close to the upper seal portion 56, the contents are prevented from spewing out to the outside of the pouch when heated in a microwave oven. You can also do that.

<Fourth embodiment>
FIG. 12 is an enlarged view of the first side seal portion near the unsealed portion of the pouch according to the fourth embodiment. In FIG. 12, components common to those in FIG. 3 are given the same reference numerals.

The fourth embodiment is the same as the first embodiment except for the shapes of the protruding sealed portion and the unsealed portion. The protruding seal portion in the fourth embodiment has an arc shape that protrudes toward the accommodation space and does not have a corner area.
The overhanging seal portion 355 in FIG. 12 is a semi-ellipse when viewed from above, and its long axis substantially coincides with the length direction of the first side seal portion 51 (ie, the vertical direction d2). That is, in FIG. 12, the protruding seal portion 355 is symmetrical in the vertical direction d2.
The overhanging seal portion 355 has an upper overhang region 355a above the center line (axis of symmetry that coincides with the vertical direction d2) 310, and a lower overhang region 355b below the center line 310.

FIG. 12 is an example, and the shape and size of the protruding seal portion are not particularly limited as long as the protruding seal portion has an arc shape. For example, the protruding seal portion may be semicircular, may be a combination of a semiellipse and a rectangle, or may be asymmetrical in the vertical direction d2. In addition, the size of the protruding seal portion should be determined by considering the volume of the storage space 2, ensuring that it does not become an obstacle when filling the contents, and the size of the communication area with the unsealed portion when steaming. Set as appropriate.

In FIG. 12, the width of the protruding seal portion (the length in the direction from the housing space 2 toward the unsealed portion 360) is shown to be thicker near the first side seal portion 51 and thinner near the center line 310. ing. However, the present invention is not limited to FIG. 12, and all the protruding seal portions may be formed with the same width.

In the fourth embodiment, the shape of the unsealed portion 360 is not particularly limited, and may be the same shape as the protruding sealed portion or may be a different shape. For example, as shown in FIG. 12, the unsealed portion 360 may have a shape that is a combination of a semicircle located on the accommodation space 2 side and a rectangle located on the side edge 13 side of the first side seal portion 51. .

In the fourth embodiment, the area where the heat generating ink layer is formed is the same as in the first embodiment. That is, the heat-generating ink layer is formed on at least one of at least a portion of the lower seal portion, at least a portion of the upper seal portion, and at least a portion of the overhanging seal portion. The exothermic ink layer on the overhanging seal portion is continuous with the exothermic ink layer formed on at least one of the upper seal portion and the lower seal portion. FIG. 12 is an example for explaining the invention, and the application area is not limited to that shown in the figure as long as it is applied as described above.

In FIG. 12, a heat generating ink layer is provided in the upper overhang region 355a of the overhang seal portion 355 and the region 57a of the upper seal portion 57. In FIG. 12, the heat generating ink layer is formed so as to reach the center line 310, but the heat generating ink layer may be provided halfway between the region 57a and the center line 310.

In this way, also in the pouch of this embodiment, by forming the heat-generating ink layer on the overhanging seal portion 355, it is possible to reduce the bonding force of the sheet 11 at the overhang seal portion 355 when heating in a microwave oven. Seal regression at the seal portion can be prevented. Moreover, even when the pouch of this embodiment accommodates contents that generate a small amount of steam, it is possible to release the steam in the storage space 2 to the outside from the protruding seal portion 355.

Furthermore, as shown in FIG. 12, by forming a heat-generating ink layer on the upper overhanging region 355a close to the upper seal portion 56, the contents are prevented from spewing out to the outside of the pouch when heated in a microwave oven. You can also do that.

When the overhanging seal portion has a shape that does not have a corner area as in the fourth embodiment, there is an advantageous effect that the bag can be prevented from being torn from the overhanging seal portion due to the impact when the pouch is dropped. can be played.

<Fifth embodiment>
FIG. 13 is an enlarged view of the first side seal portion near the unsealed portion of the pouch according to the fifth embodiment. In FIG. 13, components common to those in FIG. 3 are given the same reference numerals.

The fifth embodiment is the same as the first embodiment except for the shapes of the protruding sealed portion and the unsealed portion.
The overhanging seal portion 455 in FIG. 13 has a rectangular shape when viewed from above, and includes an upper overhang region 455a, a lower overhang region 455b, and a middle overhang region 455c. Furthermore, the overhanging seal portion 455 has a projection 456a that projects into the accommodation space 2 from the upper overhang region 455a, and a projection 456b that projects into the accommodation space 2 from the lower overhang region 455b. In FIG. 13, the protrusions 456a and 456b are triangular when viewed from above, and have fan-shaped corners. The two protrusions 456a and 456b are symmetrical in the vertical direction d2.

Note that FIG. 13 is an example, and the shapes of the protruding seal portion and the protrusion are not particularly limited. For example, the protruding seal portion may have a trapezoidal shape such as an equiangular trapezoid when viewed from above. Further, the shape of the protrusion may be a rectangle, a circular arc, an elliptical arc, or the like. The size of the protruding seal portion and the protrusion is determined by taking into account the volume of the storage space 2, ensuring that it does not become an obstruction when filling the contents, and the size of the communication area with the unsealed portion when vaporized. Set as appropriate.

Although FIG. 13 illustrates the case where the unsealed portion 460 is an equiangular trapezoid, the shape of the unsealed portion is particularly limited in this embodiment as long as the seal width of the overhanging seal portion can be secured appropriately. Not done. For example, unsealed portion 460 may be rectangular, semicircular, triangular, or the like.

In the fifth embodiment, the region where the heat generating ink layer is formed is the same as in the first embodiment. That is, the heat-generating ink layer is formed on at least one of at least a portion of the lower seal portion, at least a portion of the upper seal portion, and at least a portion of the overhanging seal portion. The exothermic ink layer on the overhanging seal portion is continuous with the exothermic ink layer formed on at least one of the upper seal portion and the lower seal portion. FIG. 13 is an example for explaining the invention, and the application area is not limited to that shown in the figure as long as it is applied as described above.

In FIG. 13, a heat-generating ink layer is provided on the upper overhang region 455a of the overhang seal portion 455, the protrusion 456a, and the region 57a of the upper seal portion 57.
By heating the pouch having the overhanging seal portion shown in FIG. 13 in a microwave oven, the bonding force of the sheet 11 decreases in the upper overhang region 455a and peeling occurs, and the steam in the accommodation space 2 is released to the outside of the pouch. .

In this way, also in the pouch of this embodiment, by forming a heat-generating ink layer on the overhanging seal portion 455, it is possible to reduce the bonding force of the sheet 11 at the overhang seal portion 455 during heating in a microwave oven. Seal regression at the seal portion can be prevented. Moreover, even when the pouch of this embodiment accommodates contents that generate a small amount of steam, it is possible to release the steam in the storage space 2 to the outside from the protruding seal portion 455.

Furthermore, since FIG. 13 shows a configuration in which a heat-generating ink layer is formed on the upper overhanging region 455a close to the upper seal portion 57, it is also possible to prevent the contents from spewing out to the outside of the pouch during heating in a microwave oven.

With a shape in which the protruding seal portion has a protrusion as in the fifth embodiment, it is possible to suppress the contents from scattering to the upper part of the accommodation space 2 when bumping occurs during heating in a microwave oven.

<Sixth embodiment>
FIG. 14 shows a plan view of a pouch according to another embodiment of the invention. The pouch shown in FIG. 14 is a flat bag type pouch similarly to FIG. 1. The present invention is similarly applicable to pouches of other shapes such as standing pouches, gusseted pouches, box pouches, four-sided pouches, and three-sided pouches.

In FIG. 14, components common to those in FIG. 1 are given the same reference numerals. In the pouch 500 according to the seventh embodiment, as shown in FIG. 14, the outer edge 50a of the seal portion 50 extends circumferentially along the edges 12 to 14 of the sheet 11. On the other hand, the inner edge 50b of the seal portion 50 extends in a circumferential manner while being spaced apart from the outer edge 50a.

The seal portion 50 includes a first side seal portion 51, a second side seal portion 52, an upper seal portion 53, and a lower seal portion 54, as in FIG. Each side seal portion 51, 52 is formed by heat-sealing the vicinity of the side edge 13 of two sheets 11. The upper seal portion 53 is formed by heat sealing the vicinity of the upper edge 12 of the sheet 11. The lower seal portion 54 is formed by heat sealing the vicinity of the lower edge 14 of the sheet 11.
The first side seal portion 51 is composed of a side end seal portion 551 and an overhanging seal portion 555. The overhanging seal portion 555 is connected to the side end seal portion 551 on the side opposite to the side edge 13 .

The unsealed portion 560 is an area near the side edge 13 of the sheet where the two sheets 11 are not heat-sealed. The unsealed portion 560 is isolated from the accommodation space 2 and the side edge 13 by the side seal portion on the corresponding side (in FIG. 15, the side end seal portion 551 and the overhanging seal portion 555 of the first side seal portion 51). ing.

Note that in this embodiment, the unsealed portion 560 does not reach the side edge 13 of the sheet. Therefore, the side edge of the second sealed portion 52 facing the first sealed portion 51 is not provided with an unsealed portion as illustrated in FIG. 1 .

15 and 16 are enlarged views of the first side seal portion near the unsealed portion of the pouch according to the sixth embodiment. In FIGS. 15 and 16, components common to those in FIG. 3 are given the same reference numerals. Moreover, the same reference numerals are attached to the common components in FIGS. 15 and 16.

The side edge seal portion 551 is formed by heat sealing the vicinity of the side edge 13 of the sheet 11 (laminated film 30). That is, the side end seal portion 551 is located on the side edge 13 side of the sheet 11 (laminated film 30) with respect to the accommodation space 2. The side end seal portion 551 extends in the vertical direction d2 of the pouch 500 and connects to the upper seal portion 53 and the lower seal portion 54.
The side end sealed portion 551 is divided into a central sealed portion 558, an upper sealed portion 556, and a lower sealed portion 557 with the unsealed portion 560 as a reference. The center sealed portion 558 is a region in the side end sealed portion 551 located at a position corresponding to the position where the unsealed portion 560 is provided in the vertical direction d2 of the pouch 500. Upper seal portion 556 is located above central seal portion 558. Lower seal portion 557 is located below central seal portion 558. In addition, in FIGS. 15 and 16, the width of the upper seal portion 556 (the width in the direction from the storage space 2 to the outside of the pouch) is the width of the lower seal portion 557 (the width in the direction from the storage space 2 to the outside of the pouch). Although shown as being larger than the above, the width of the upper seal portion 556 and the width of the lower seal portion 557 may be substantially the same.

The overhanging seal portion 555 in FIGS. 15 and 16 is a rectangle with fan-shaped corners curved when viewed from above. That is, like the first embodiment, the overhanging seal portion 555 includes an upper overhang region 555a, a lower overhang region 555b, a middle overhang region 555c, an upper corner region 555d, and a lower corner region 555e. An upper seal portion 556 of the side end seal portion 551 connects with the overhang seal portion 555 via an upper overhang region 555a. Further, the lower seal portion 557 is connected to the overhanging seal portion 555 via the lower overhang region 555b.

In the sixth embodiment, the size of the overhanging seal portion (the lengths of the upper overhang region 555a, the lower overhang region 555b, and the middle overhang region 555c) is not particularly limited. However, the size of the protruding seal portion should be determined based on the volume of the storage space 2, ensuring that it does not become an obstacle when filling the contents, and the size of the communication area with the unsealed portion when steaming. Set as appropriate.

As shown in FIGS. 15 and 16, the unsealed portion 560 is surrounded by the first side seal portion 51, that is, the side end seal portion 551 and the overhanging seal portion 555. The unsealed portion 560 projects further toward the accommodation space 2 than the side end sealed portion 551. As a result, a protruding seal portion 555 is formed in the first side seal portion 51 that protrudes further toward the accommodation space 2 than the side end seal portion 551 .

An edge 562 of the unsealed portion 560 extends between a first edge 563 and a second edge 564 that extend toward the accommodation space 2, and a tip of the first edge 563 and a tip of the second edge 564. A third edge 565 and a fourth edge 566 are included. The first edge 563 and the second edge 564 extend linearly in the lateral direction d1, and the length of the first edge 563 is equal to the length of the second edge 564. The third edge 565 and the fourth edge 566 extend linearly in the vertical direction d2, and the length of the third edge 565 is equal to the length of the fourth edge 566. The third edge 565 and the fourth edge 566 are each perpendicular to the first edge 563. Further, the third edge 565 and the fourth edge 566 are each perpendicular to the second edge 564. That is, the unsealed portion 560 shown in FIGS. 15 and 16 is rectangular.
The first edge 563, the second edge 564, and the third edge 565 correspond to sides opposite to the accommodation space 2 in the upper overhang region 555a, the lower overhang region 555b, and the middle overhang region 555c, respectively. The fourth edge 566 corresponds to the side of the central seal portion 558 of the side end seal portion 551 opposite to the side end 13 . Therefore, in the seventh embodiment, the overhanging seal portion 555 surrounds a portion of the unsealed portion 560.

FIG. 17 is a cross-sectional view showing an example of the vicinity of the unsealed part of the pouch according to the sixth embodiment. FIG. 17 corresponds to the AA' cross section in FIG. 15.
In the example of FIG. 17, a hole 561 is provided in the unsealed portion 560, which penetrates through all of the stacked laminated films 30. In FIG. 15, the shape of the hole 561 when viewed from above is circular, but the present invention is not limited to this, and may be, for example, oval, quadrilateral, triangular, or the like. Moreover, in place of the hole, a notch passing through all of the stacked laminated films may be used. As shown in FIG. 17, the positions of the holes provided in each laminated film 30 are preferably the same, but the positions of the two holes may be shifted.

In the example of FIG. 17, a hole is provided in each of the two laminated films 30, but it is also possible to provide a hole or a cut through one of the laminated films.
Furthermore, when the pouch is viewed in plan, the number of holes or cuts is not limited to one, and a plurality of holes or cuts may be formed. Further, the present invention is not limited to the case where only a hole or only a notch is formed, and both a hole and a notch may be formed in the unsealed portion 560.

In the sixth embodiment, the area where the heat generating ink layer is formed is the same as in the first embodiment. That is, the heat-generating ink layer is formed on at least one of at least a portion of the lower seal portion, at least a portion of the upper seal portion, and at least a portion of the overhanging seal portion. The exothermic ink layer on the overhanging seal portion is continuous with the exothermic ink layer formed on at least one of the upper seal portion and the lower seal portion. 15 and 16 are examples for explaining the invention, and as long as the coating is performed as described above, the coating area is not limited to the figures.

In FIG. 15, the exothermic ink layer is provided over the entire overhanging seal portion 555, region 556a of the upper seal portion 556, and region 557a of the lower seal portion 557.

In FIG. 16, the heat generating ink layer is provided in the upper overhang region 555a, the upper corner region 555d, and the region 556a of the upper seal portion 556.

In this embodiment, in addition to the upper seal portion 556 and the lower seal portion 557, a heat-generating ink layer may also be provided on the central seal portion 558 in consideration of the releasability of the overhanging seal portion, manufacturing cost, and the like.

Note that in FIGS. 15 and 16, the lengths in the lateral direction d1 of the region 556a and the region 557a correspond to the widths of the upper seal portion 556 and the lower seal portion 557, respectively; It may be smaller than the width of the seal portion 557.

In this embodiment, as in the first embodiment, a heat generating ink layer is formed on the entire or part of the protruding seal portion 555. Therefore, when heating in a microwave oven, the conductive polymer and conductive particles in the heat-generating ink heat the overhanging seal portion 555 in the region where the heat-generating ink layer is provided, and the sheet 11 is joined at the overhang seal portion 555. Power decreases. Then, when the pressure within the housing space 2 increases, the sheet 11 peels off at the overhanging seal portion 555 where the bonding force has weakened. Then, the steam in the accommodation space 2 is released from the peeled portion to the outside of the pouch 550 through the unsealed portion 560 and the hole 561 (or notch).

In this way, also in the pouch of this embodiment, by forming a heat-generating ink layer on the overhanging seal portion 555, it is possible to reduce the bonding force of the sheet 11 at the overhang seal portion 555 during heating in a microwave oven. Seal regression at the seal portion can be prevented. Also,
The pouch of this embodiment can release the steam in the storage space 2 to the outside even when containing contents that generate a small amount of steam.

Further, in the present invention, a heat generating ink layer is provided in at least one of the region 556a and the region 557a so as to be continuous with the heat generating ink layer of the overhanging seal portion 555. By doing so, the heat generated in the heat generating ink layer of the lower seal portion 557 and the upper seal portion 556 is transmitted to the overhanging seal portion 555, and the peeling of the sheet 11 at the overhang seal portion 555 is promoted more efficiently. be able to. With such a configuration, as described in the first embodiment, steam can be reliably released regardless of the heating method of the microwave oven used.

In particular, as shown in FIG. 16, by forming a heat-generating ink layer on the upper overhanging region 555a close to the upper seal portion 556, the contents are prevented from spewing out to the outside of the pouch when heated in a microwave oven. You can also do that.

In this embodiment as well, similarly to the first embodiment, the application area of the heat generating ink layer is appropriately set in consideration of the releasability of the overhanging seal portion, manufacturing cost, etc.

Although the above description has been made using an example in which the shape of the protruding seal portion is rectangular as shown in FIGS. 15 and 16, the present embodiment is not limited to this. The protruding seal portion may be trapezoidal, triangular, or arcuate, as exemplified in the second to fifth embodiments, or may have a shape with protrusions at two corner regions.

The shape of the unsealed portion is not limited to that shown in FIGS. 15 and 16, and is not particularly limited as long as the seal width of the overhanging seal portion can be appropriately secured. For example, the shape of the unsealed portion may be a trapezoid, a triangle, a circle, an ellipse, or the like. In addition, it is particularly preferable that the shape of the unsealed part is substantially the same as the shape of the overhanging seal part from the viewpoint of vapor permeability and design.

<Seventh embodiment>
FIG. 18 is an enlarged view of the first side seal portion near the unsealed portion of the pouch according to the seventh embodiment. In FIG. 18, components common to those in FIGS. 3 and 15 are given the same reference numerals.
The pouch of the seventh embodiment differs from the sixth embodiment in that the unsealed portion protrudes not only toward the accommodation space but also toward the side seal portion.

The overhanging seal portion 655 in FIG. 18 is a rectangle whose corners are curved in a fan shape when viewed from above similarly to FIG. 15. Similar to FIG. 15, the unsealed portion 660 in FIG. 18 is connected to the accommodation space 2 and It is separated from the side edge 13. The unsealed portion 660 has a rectangular shape when viewed from above.

In the seventh embodiment, the first edge 663 of the unsealed portion 660 includes the side of the upper overhang region 655a opposite to the accommodation space 2 and a part of the lower end side of the upper sealed portion 556. The second edge 664 consists of the side of the lower overhanging region 655b opposite to the accommodation space 2 and a part of the upper end side of the lower seal portion #. The third edge 664 corresponds to the side of the middle projecting region 655c on the side opposite to the accommodation space 2. The fourth edge 666 corresponds to the side of the central seal portion 558 opposite to the side edge 13 . Therefore, in the eighth embodiment, the protruding seal portion 655 surrounds a portion of the unsealed portion 660.

In the seventh embodiment, the region where the heat generating ink layer is formed is the same as in the first embodiment. That is, the heat-generating ink layer is formed on at least one of at least a portion of the lower seal portion, at least a portion of the upper seal portion, and at least a portion of the overhanging seal portion. The exothermic ink layer on the overhanging seal portion is continuous with the exothermic ink layer formed on at least one of the upper seal portion and the lower seal portion. FIG. 18 is an example for explaining the invention, and the application area is not limited to that shown in the figure as long as it is applied as described above.

In FIG. 18, the heat-generating ink layer is provided in the upper overhang region 655a, the upper corner region 655d, and the region 556a of the upper seal portion 556.

Also in this embodiment, when heating in a microwave oven, the overhanging seal portion 655 in the area provided with the heat generating ink layer is heated, and the bonding force of the sheet 11 at the overhang seal portion 655 is reduced. Then, when the pressure within the accommodation space 2 increases, the sheet 11 peels off at the overhanging seal portion 655 where the bonding force has weakened. Then, the steam in the accommodation space 2 is released from the peeled portion to the outside of the pouch through the unsealed portion 660 and the hole 661 (or notch).

In this way, also in the pouch of this embodiment, by forming a heat-generating ink layer on the overhanging seal portion 655, it is possible to reduce the bonding force of the sheet 11 at the overhang seal portion 655 during heating in a microwave oven. Seal regression at the seal portion can be prevented. Moreover, even when the pouch of this embodiment accommodates contents that generate a small amount of steam, it is possible to release the steam in the storage space 2 to the outside from the protruding seal portion 655.

Furthermore, as shown in FIG. 18, by forming a heat-generating ink layer on the upper overhanging region 655a close to the upper seal portion 556, the contents are prevented from spewing out to the outside of the pouch when heated in a microwave oven. You can also do that.

<Eighth embodiment>
FIG. 19 is an enlarged view of the first side seal portion near the unsealed portion of the pouch according to the eighth embodiment. In FIG. 19, components common to those in FIGS. 3 and 15 are given the same reference numerals.
The pouch of the eighth embodiment differs from the sixth embodiment in that the unsealed portion is provided closer to the accommodation space than the side end sealed portion.

The overhanging seal portion 755 in FIG. 19 is a rectangle whose corners are curved into a fan shape when viewed from above similarly to FIG. 15 . Similar to FIG. 15, the unsealed portion 760 in FIG. 19 is connected to the accommodation space 2 and It is separated from the side edge 13. The unsealed portion 760 has a rectangular shape when viewed from above.

In the eighth embodiment, as shown in FIG. 19, the overhanging seal portion 755 includes an upper overhang area 755a, a lower overhang area 755b, a middle overhang area 755c, an upper corner area 755d, a lower corner area 755e, and an inner side. It is composed of a projecting area 755f. The first edge 763 of the unsealed portion 760 is a part of the side of the upper projecting region 755a on the side opposite to the accommodation space 2. The second edge 764 consists of a part of the side of the lower overhanging region 755b on the opposite side to the accommodation space 2. The third edge 765 corresponds to the side of the middle projecting region 755c on the side opposite to the accommodation space 2. The fourth edge 766 is located closer to the accommodation space 2 than the side edge 13 of the side end seal portion 551 on the accommodation space 2 side. The fourth edge 766 consists of the side of the inner projecting region 755f on the accommodation space 2 side. That is, in the ninth embodiment, it is surrounded by an unsealed portion 760 and an overhanging sealed portion 755.

In the eighth embodiment, the region where the heat generating ink layer is formed is the same as in the first embodiment. That is, the heat-generating ink layer is formed on at least one of at least a portion of the lower seal portion, at least a portion of the upper seal portion, and at least a portion of the overhanging seal portion. The exothermic ink layer on the overhanging seal portion is continuous with the exothermic ink layer formed on at least one of the upper seal portion and the lower seal portion. FIG. 19 is an example for explaining the invention, and the application area is not limited to that shown in the figure as long as it is applied as described above.

In FIG. 19, the heat generating ink layer is provided in the upper overhang region 755a, the upper corner region 755d, and the region 556a of the upper seal portion 556.

In this embodiment as well, when heating in a microwave oven, the overhanging seal portion 755 in the region provided with the exothermic ink layer is heated, and the bonding force of the sheet 11 at the overhang seal portion 755 is reduced. Then, when the pressure within the accommodation space 2 increases, the sheet 11 peels off at the overhanging seal portion 755 where the bonding force has weakened. Then, the steam in the accommodation space 2 is released from the peeled portion to the outside of the pouch through the unsealed portion 760 and the hole 761 (or notch).

In this way, also in the pouch of this embodiment, by forming a heat-generating ink layer on the overhanging seal portion 755, it is possible to reduce the bonding force of the sheet 11 at the overhang seal portion 755 when heating in a microwave oven. Seal regression at the seal portion can be prevented. Moreover, when the pouch of this embodiment accommodates contents that generate a small amount of steam, it is possible to release the steam in the storage space 2 to the outside.

Furthermore, as shown in FIG. 19, by forming a heat-generating ink layer on the upper overhanging region 755a close to the upper seal portion 556, the contents are prevented from spewing out to the outside of the pouch when heated in a microwave oven. You can also do that.

Next, the present invention will be explained in more detail with reference to examples, but the present invention is not limited to these examples in any way.
[Preparation of sample]
< Reference example 1>
1. Preparation of Laminated Film An alumina-deposited PET film (thickness: 12 μm) was prepared as a base material layer. An ink containing a conductive polymer (manufactured by Tokyo Ink Co., Ltd., product number MW heating agent) was gravure printed on the vapor deposition surface side of the base material layer and dried to form a heat generating ink layer with a thickness of 1 μm. Note that the heat generating ink layer is as specified in item 2. It was formed by patterning so as to be formed at the location described in .
Next, the intermediate base material layer ( Stretched Ny, thickness 15 μm) was bonded together.
Next, a sealant layer (CPP, thickness 70 μm) was attached to the surface of the stretched Ny opposite to the heat generating ink layer by a dry lamination method using the above adhesive to obtain a laminated film.

2. Preparation of Pouch A pair of sheets were obtained from the above laminated film. Two sheets are overlapped and the side and lower edges are heat-sealed to form a flat bag type pouch with the unsealed area having the shape shown in Figure 3 (the upper edge is an opening that is not heat-sealed). ) was obtained. Dimensions are listed below for the first side seal. The volume of the pouch storage space was 420 cm ³ .
(1) Unsealed portion Length of first edge 63 (second edge 64): 15 mm
Length of third edge 65: 15mm
Length of opening 61: 15mm
(2) First side seal portion Width of upper seal portion 57 (width in lateral direction d1 from pouch edge 13): 10 mm
Width of lower seal portion 56 (width in lateral direction d1 from pouch edge 13): 6 mm
(3) Overhanging seal portion Distance from the pouch edge 13 to the end of the middle overhang area 55c on the storage space side: 17.5 mm
Width of upper overhang region 55a (width in vertical direction d2 in FIG. 3): 3 mm
Width of lower overhang area 55b (width in vertical direction d2 in FIG. 3): 3 mm
Width of middle projecting region 55c (width in lateral direction d1 in FIG. 3): 2.5 mm

The heat sealing conditions were as follows.
・Temperature: 180℃
・Time: 1.5 seconds ・Pressure: 2.0MPa (air cylinder type)

In Reference Example 1, a heat-generating ink layer was formed at the locations shown in FIG. Specifically, a heat-generating ink layer was formed in the areas described in (4) to (6) below.
(4) Overhanging seal portion 55: Full surface (5) Upper seal portion (area 56a): Rectangular exothermic ink layer application area Width in the vertical direction d2 from the first edge 63 of the unsealed portion 60: 5 mm
Width in the lateral direction d1 from the pouch edge 13: 10 mm (full width of the upper seal portion 56)
(6) Lower sealed portion (area 57a): rectangular exothermic ink layer application area Width in the vertical direction d2 from the second edge 64 of the unsealed portion 60: 5 mm
Width in lateral direction d1 from pouch edge 13: 6 mm (full width of lower seal portion 57)

Water (160 g) was contained in the pouch, and the opening at the upper edge was heat-sealed to obtain a pouch of Reference Example 1.

<Example 2>
A pouch (flat bag type pouch) of Example 2 was obtained in the same process as Reference Example 1 except that a heat generating ink layer was formed at the locations shown in FIG. The areas where the heat generating ink layer is formed are specifically as shown in (7) to (8) below.
(7) Overhanging seal portion 55: Upper overhang area 55a
(8) Upper sealed portion (area 56a): Rectangular heat-generating ink layer application area Width in the vertical direction d2 from the first edge 63 of the unsealed portion 60: 5 mm
Width in the lateral direction d1 from the pouch edge 13: 10 mm (full width of the upper seal portion 56)

<Example 3>
Using the same laminated film as in Reference Example 1, a flat bag type pouch having the shape shown in FIG. 9 near the unsealed part was obtained. The dimensions of the first side seal are described in (9) to (11) below. The volume of the storage space of the pouch was 420 cm ³ , water (160 g) was contained therein, and the pouch was sealed.
(9) Unsealed portion Shape: Right-angled isosceles triangle Length of first edge 263: 15 mm
Length of opening 61: 15mm
(10) First side seal portion Width of upper seal portion 57 (width in lateral direction d1 from pouch edge 13): 6 mm
Width of lower seal portion 56 (width in lateral direction d1 from pouch edge 13): 6 mm
(11) Protruding seal portion Distance from the pouch edge 13 to the end of the corner area 255c on the housing space side: 21 mm
Width of upper overhang area 255a (width in vertical direction d2): 3 mm
Width of connection between lower overhang area 255b and corner area 255c: 3 mm
Connection width of lower overhang area 255b with lower seal portion 56: 5 mm

In Example 3, a heat-generating ink layer was formed at the locations shown in FIG. Specifically, a heat-generating ink layer was formed in the areas described in (12) to (13) below.
(12) Overhanging seal portion 255: Upper overhang area 255a
(13) Upper sealed portion (area 56a): Rectangular heat generating ink layer application area Width in the vertical direction d2 from the first edge 263 of the unsealed portion 260: 5 mm
Width in lateral direction d1 from pouch edge 13: 6 mm (full width of upper seal portion 56)

<Example 4>
Using the same laminated film as in Reference Example 1, a flat bag type pouch having the shape shown in FIG. 12 near the unsealed portion was obtained. The dimensions of the first side seal are described in (14) to (16) below. The volume of the storage space of the pouch was 420 cm ³ , water (160 g) was contained therein, and the pouch was sealed.
(14) Unsealed part Shape: Rectangular and semicircular Rectangular part: Width of opening 61 (width in vertical direction d2) 15 mm
Semicircular portion: Diameter connects with rectangular portion (15) First side seal portion Width of upper seal portion 57 (width in lateral direction d1 from pouch edge 13): 6 mm
Width of lower seal portion 56 (width in lateral direction d1 from pouch edge 13): 6 mm
(16) Overhanging seal portion Shape: Elliptical arc (long axis matches vertical direction d2, short axis matches horizontal direction d1)
Connection width between upper overhang area 255a and upper seal portion 57: 3 mm
Connection width between lower overhang area 355b and lower seal portion 56: 3 mm
Width of protruding seal portion 355 on center line 310: 2.5 mm

In Example 4, a heat-generating ink layer was formed at the locations shown in FIG. Specifically, a heat-generating ink layer was formed in the areas described in (17) to (18) below.
(17) Overhanging seal portion 355: Upper overhang area 355a
(18) Upper seal portion (area 56a):
Width in the vertical direction d2 from the opening 61 of the unsealed portion 360: 5 mm
Width in the lateral direction d1 from the pouch edge 13: 10 mm (full width of the upper seal portion 56)

<Example 5>
Using the same laminated film as in Reference Example 1, a flat bag type pouch having the shape shown in FIG. 16 near the unsealed portion was obtained. The dimensions of the first side seal are described in (19) to (21) below. The volume of the storage space of the pouch was 420 cm ³ , water (160 g) was contained therein, and the pouch was sealed.
(19) Unsealed portion Length of first edge 563 (second edge 564): 15 mm
Length of third edge 565 (fourth edge 566): 15 mm
Diameter of through hole (both sides of sheet): 6mm
(20) First side seal portion Width of upper seal portion 556 (width in lateral direction d1 from pouch edge 13): 6 mm
Width of lower seal portion 557 (width in lateral direction d1 from pouch edge 13): 6 mm
Width of central seal portion 558 (width in lateral direction d1 from pouch edge 13): 6 mm
(21) Protruding seal portion Distance from pouch edge 13 to end of middle protruding area 55c on the storage space side: 24 mm
Width of upper overhang region 555a (width in vertical direction d2 in FIG. 3): 3 mm
Width of lower overhang area 555b (width in vertical direction d2 in FIG. 3): 3 mm
Width of middle overhanging region 555c (width in lateral direction d1 in FIG. 3): 3 mm

In Example 5, a heat-generating ink layer was formed at the locations shown in FIG. Specifically, a heat-generating ink layer was formed in the areas described in (22) to (23) below.
(22) Overhanging seal portion #: Upper overhang area 555a and upper corner area 555d
(23) Upper seal portion (area 556a): Rectangular heat-generating ink layer application area Width in the vertical direction d2 from the boundary with the central seal portion 558: 5 mm
Width in lateral direction d1 from pouch edge 13: 10 mm (full width of upper seal portion 556)

<Comparative example 1>
A pouch (flat bag type pouch) of Comparative Example 1 was obtained in the same process as Reference Example 1 except that the heat generating ink layer was not provided.

<Comparative example 2>
As Comparative Example 2, the same pouch (flat bag type pouch) as in Example 4 was obtained, except that the heat generating ink layer was not provided.

[evaluation]
<Sealability evaluation>
The pouches of Examples and Comparative Examples were placed upright inside a flat table microwave oven. Thereafter, it was heated at 600 W for 180 seconds. Thereafter, the pouch was taken out of the microwave oven and the condition of the seal portion was visually observed. Twenty pouches were tested in each Example and Comparative Example and evaluated based on the following criteria. The results are shown in Table 1.
A: For all pouches, peeling was confirmed in the overhanging seal area where the heat generating ink layer was formed, and there was no peeling or seal regression in the seal area other than the area where the heat generating ink layer was formed.
B: At least one pouch in which seal regression occurred in the seal area other than the region where the heat-generating ink layer is formed.
C: At least one pouch in which seal regression and leakage of contents during heating were confirmed in the seal area other than the area where the heat-generating ink layer is formed.

<Blowout evaluation>
While the pouches of Examples and Comparative Examples were heated under the above conditions, the appearance of boiling over through the overhanging sealed portions and unsealed portions was visually observed. Twenty pouches were tested in each Example and Comparative Example and evaluated based on the following criteria. The results are shown in Table 1.
A: No boiling over was observed in any of the pouches.
B: There were 1 to 4 pouches with confirmed boiling.
C: There were 5 or more pouches with confirmed boiling.

In all of the examples, no seal regression of the seal portion was observed in areas other than the area where the heat generating ink layer was formed. In addition, in the pouch of Example, it was confirmed that steam was gradually released from the protruding seal portion from a relatively early stage during heating in the microwave oven. In addition, in Reference Example 1, peeling of the sheet was observed throughout the overhanging seal portion, and the appearance was inferior to that of other Examples.
In Examples 2 to 5, no spillage of the contents was observed because the seals were opened above the overhanging seal portion. In Reference Example 1, the entire overhanging seal portion was opened, and some of the pouches suffered from boiling over.

In Comparative Example 1, release of steam through the overhanging sealed portion and the unsealed portion was confirmed. However, some pouches were identified where seal regression occurred. In addition, since the pouch of Comparative Example 1 was opened near the lower corner region of the overhanging seal portion, the contents sometimes spouted out to the outside of the pouch through the opened portion.

In Comparative Example 2, no vapor was released through the overhanging seal portion, and peeling occurred in other seal areas.

1 Pouch 2 Accommodation space 11 Sheet 30 Laminated film 31 Base material layer 34 Sealant layer 36 Heat-generating ink layer 50 Seal portion 51 First side seal portion 52 Second side seal portion 551 Side end seal portion 55, 555 Overhang seal portion 55a, 555a Upper overhang area 55b, 555b Lower overhang area 55c, 555c Middle overhang area 55d, 555d Upper corner area 55e, 555e Lower corner area 56, 556 Upper seal portion 57, 557 Lower seal portion 60, 560 Not sealed Part 61 Opening 561 Hole

Claims (3)

A pouch made by stacking and heat-sealing at least one laminated film having a sealant layer so that the sealant layer is on the inner layer side, and having a storage space for storing contents, the pouch comprising:
a side seal portion in which the laminated film is heat-sealed;
an unsealed part separated from the accommodation space by the side seal part and in which the stacked laminated films are not heat-sealed;
has
the unsealed portion reaches a side edge of the laminated film and opens;
The side seal portion includes an upper seal portion and a lower seal portion located on both sides of the unsealed portion, and the upper seal portion and the lower seal portion surrounding at least a portion of the unsealed portion. an overhanging seal portion that is connected to the upper seal portion and the lower seal portion and that extends toward the accommodation space side,
The laminated film has a heat-generating ink layer on an outer layer than the sealant layer, and the heat-generating ink layer is located between at least a portion of the lower seal portion and at least a portion of the overhanging seal portion. The seal is provided continuously and is not provided on the upper seal portion, or is provided continuously between at least a portion of the upper seal portion and at least a portion of the overhanging seal portion and is provided on the lower side. A pouch that is not attached to the seal part . The pouch according to claim 1, wherein the heat generating ink layer contains one or more selected from a conductive polymer and carbon black. 2. The heat-generating ink layer is provided on at least a portion of the upper seal portion and a region of the overhanging seal portion that is close to the upper seal portion , and is not provided on the lower seal portion. The pouch according to claim 2.