JP2021066516A - Pouch - Google Patents

Abstract

To provide a pouch capable of suppressing occurrence of seal retreat when the internal pressure increases due to heating and discharging steam to the outside from a desired position.SOLUTION: The pouch comprises: side sealed portions where a laminated film is heat-sealed; and an unsealed portion which is separated from an accommodation space by the side sealed portions and in which the overlapped laminated film is not heat-sealed. The unsealed portion has an opening at a side edge of the laminated film. The side sealed portion has an upper sealed portion, a lower sealed portion, and an overhanging sealed portion. At least one of the laminated films has a heat-generating ink layer as a layer outer than the sealant layer. The heat-generating layer is continuously arranged between at least a part of the overhanging seal portion and at least a part of a region located on an opening side with respect to an inner edge on an accommodation space side of the upper sealed portion and the lower sealed portion in the unsealed portion.SELECTED DRAWING: Figure 1

Description

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

For example, microwave oven pouches containing retort-packed foods and frozen foods are widely used. When the pouch is heated in a microwave oven, the water contained in the contents evaporates as the pouch is heated, and the pressure inside the pouch rises. When the pressure inside the pouch increases, the pouch may break and the contents may scatter.

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

Patent Documents 2 to 4 describe a sealing region formed by heat-sealing a laminated film in a peripheral region surrounding the accommodation space, an unsealed region separated from the accommodation space by the sealing region, and not heat-sealed. A pouch having a shape in which the seal region has an overhanging portion extending toward the accommodation space is disclosed at a portion where the seal region is formed. In the pouches of Patent Documents 2 to 4, two laminated films are laminated and the vicinity of the peripheral edge of the laminated film is heat-sealed to produce a pouch. When the pressure inside the pouch increases due to heating, the stress is concentrated on the corners of the overhanging part. As a result, the sealed region of the overhanging portion is peeled off, so that the accommodation space and the unsealed region communicate with each other, and the steam in the pouch can be released to the outside.

Japanese Unexamined Patent Publication No. 2010-36968 Japanese Unexamined Patent Publication No. 2015-12050 Japanese Unexamined Patent Publication No. 2016-74457 Japanese Unexamined Patent 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 is a problem that the manufacturing process is complicated, the cost increases, and the material cost is also high. In addition, when an easily peelable material is used, sufficient sealing strength cannot be ensured, and when an impact is applied to the pouch such as when it is dropped, peeling occurs at the heat-sealed part around the notch and the contents leak. There was a risk of putting it out.

In Patent Documents 2 to 4, the sealant needs to be a material that is softened by heating with a microwave oven and the sealing strength is lowered. Therefore, the sealant material is limited. Further, although the overhanging portion is formed to facilitate the occurrence of steam release, the steam release may be slow, and at this time, the seal retreat may occur in the seal portion other than the overhanging portion.

The present invention has been made in view of the above problems, and provides a pouch capable of suppressing the occurrence of seal retreat when the internal pressure increases due to heating and releasing steam to the outside from a desired location. The purpose.

In order to solve the above problems, the present invention provides the following [1] to [4].
[1] A pouch having a storage space for accommodating the contents, which is made by laminating at least one laminated film having a sealant layer and heat-sealing the layers so that the sealant layer is on the inner layer side. The unsealed portion has a side seal portion in which the laminated film is heat-sealed and an unsealed portion in which the laminated film is separated from the accommodation space by the side seal portion and the laminated film is not heat-sealed. The laminated film has an opening on the side edge, and the side sealing portion surrounds the upper sealing portion and the lower sealing portion located on both sides of the unsealed portion and at least a part of the unsealed portion. In this way, the upper seal portion and the lower seal portion are connected to each other, and the upper seal portion and the overhanging seal portion protruding toward the accommodation space side from the lower seal portion are provided. At least one of the laminated films has a heat-generating ink layer on the outer layer of the sealant layer, and the heat-generating ink layer is formed in at least a part of the overhanging seal portion and in the region of the unsealed portion. A pouch that is continuously provided between the upper seal portion and at least a part of a region located on the opening side of the lower seal portion on the inner edge of the accommodation space side.
[2] The pouch according to [1], wherein the heat-generating ink layer reaches the inner edge of the overhanging seal portion on the accommodation space side.
[3] The pouch according to [1] or [2], wherein the heat-generating ink layer is provided in a part of the accommodation space beyond the inner edge of the overhanging seal portion on the accommodation space side.
[4] When the direction in which the upper seal portion, the unsealed portion, and the lower seal portion are arranged is the first direction, the heat generating ink layer is a part of the overhang seal portion. The pouch according to any one of [1] to [3], which is provided in the region including the center in the first direction.

According to the present invention, it is possible to obtain a pouch capable of suppressing the occurrence of seal retreat when the internal pressure increases due to heating and releasing steam to the outside from a desired location.

It is a top view which shows the pouch of one Embodiment of this invention. It is sectional drawing which shows the layer structure of a laminated film. It is an enlarged view of the 1st side seal part near the unsealed part in the pouch which concerns on 1st Embodiment. It is a modification of the pouch which concerns on 1st Embodiment, and is an enlarged view of the 1st side seal part near the unsealed part. It is a modification of the pouch which concerns on 1st Embodiment, and is an enlarged view of the 1st side seal part near the unsealed part. It is a modification of the pouch which concerns on 1st Embodiment, and is an enlarged view of the 1st side seal part near the unsealed part. It is an enlarged view of the 1st side seal part near the unsealed part in the pouch which concerns on 2nd Embodiment. It is an enlarged view of the 1st side seal part near the unsealed part in the pouch which concerns on 2nd Embodiment. It is an enlarged view of the 1st side seal part near the unsealed part in the pouch which concerns on 2nd Embodiment. It is an enlarged view of the 1st side seal part near the unsealed part in the pouch which concerns on 3rd Embodiment. It is an enlarged view of the 1st side seal part near the unsealed part in the pouch which concerns on 3rd Embodiment. It is an enlarged view of the 1st side seal part near the unsealed part in the pouch which concerns on 3rd Embodiment. It is an enlarged view of the 1st side seal part near the unsealed part in the pouch which concerns on 4th Embodiment. It is an enlarged view of the 1st side seal part near the unsealed part in the pouch which concerns on 5th Embodiment.

Hereinafter, the present invention will be described in detail. The notation of the numerical range of "AA to BB" in this specification means "AA or more and BB or less".

The present invention is a pouch having a storage space for accommodating the contents, which is made by laminating at least one laminated film having a sealant layer and heat-sealing the layers so that the sealant layer is on the inner layer side. The unsealed portion has a side seal portion in which the laminated film is heat-sealed, and an unsealed portion in which the laminated film is separated from the accommodation space by the side seal portion and the laminated film is not heat-sealed. , The side edge of the laminated film has an opening, and the side seal portion includes an upper seal portion and a lower seal portion located on both sides of the unseal portion, and at least a part of the unseal portion. It has an overhanging seal portion that is connected to the upper seal portion and the lower seal portion so as to surround the upper seal portion and projects toward the accommodation space side from the upper seal portion and the lower seal portion. However, at least one of the laminated films has a heat-generating ink layer on the outer layer of the sealant layer, and the heat-generating ink layer is contained in at least a part of the overhanging seal portion and in the region of the unsealed portion. The pouch is continuously provided between the upper seal portion and at least a part of the region located on the opening side of the lower seal portion on the inner edge of the accommodation space side.

[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 (front sheet 11a, back sheet 11b) are arranged on top of each other, and the side edge 13 and the lower edge 14 of the sheet 11 are heat-sealed with each other. As a result, an accommodation space 2 for accommodating the 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 has been devised to secure a wide opening 4, and the contents can be efficiently filled in the accommodation space 2 from the opening 4. After the contents are filled, the pouch 1 is obtained by heat-sealing the vicinity of the upper edge 12 provided with the opening 4.

The present invention is similarly applicable to pouches having different shapes such as standing pouches, gusset pouches, box pouches, four-way pouches, and three-way 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 the laminated film 30 forming the two sheets. The laminated film 30 is provided with a sealant layer 34 having a sealing property on a portion on the inner side of the container. Further, the laminated film 30 is provided with a base material layer 31 as a printing base material on a portion on the outer side of the container with respect to the sealant layer 34. The laminated film 30 is provided with a heat generating ink layer 36 between the base material layer 31 and the sealant layer 34. Further, the laminated film 30 includes an intermediate base material layer 33 between the base material layer 31 and the sealant layer 34 in order to impart various functions required for a pouch for a microwave oven.

The pouch 1 of the present embodiment is described by taking the case where two sheets 11 are stacked to make a bag, but one sheet (laminated film 30) is provided with the sealant layer 34 on the inner side of the container. It may be a pouch that is folded so as to be made into 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 of a front 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.

Hereinafter, each layer will be described in detail.
[Base layer]
The base material layer 31 is the outermost layer of the laminated film 30 when the bag is made into the pouch 1.
The base material layer 31 is transparent so that the 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 bag is made into the pouch 1. It is preferable to do so.
In addition, the pouch 1 for a microwave oven is required to be resistant to heat. Therefore, the base material layer 31 of the present 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-pressed co-stretched film, or a composite film in which two or more of these films are laminated is used. Can be used.
As the above-mentioned film, in order to enhance the gas barrier property, a film on which an inorganic substance such as silicon oxide or aluminum oxide is vapor-deposited, or a film on which a coating film of an ethylene-vinyl alcohol copolymer is formed may be used.

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

[Heat-generating ink layer]
In the present embodiment, the heat generating ink layer 36 is laminated on the surface of the base material layer 31 on the accommodation space side. The heat generating ink layer 36 is provided between the base material layer 31 and the sealant layer 34. That is, the heat-generating ink layer is an outer layer than the sealant layer 34. The heat-generating ink layer 36 is formed at a predetermined position in the plane of the base material layer 31 so that the heat-generating ink layer 36 is provided at a predetermined position when the pouch 1 is formed as described later.
The thickness of the heat-generating ink layer is preferably 0.1 μm or more, and more preferably 0.5 μm or more, in consideration of the amount of heat generated during microwave heating, coatability, manufacturing cost, and the like. Further, from the viewpoint of preventing damage to the laminated film due to heat generation 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 to have.

The heat generating ink layer 36 contains 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, the conductive polymer is suitable because it has good transparency of visible light and is less likely to generate sparks due to microwaves.
As the conductive polymer, one or more compounds selected from polythiophenes, polypyrroles, polyanilines, polyacetylenes, polyphenylenes, polyphenylene vinylenes, polyacenes and polythiophene vinylenes are preferable, and in addition to these compounds, a dopant is further added. 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, dyes, Included are alkylammonium ions and quaternary phosphonium salts.
Examples of the conductive particles include carbon black and metal particles.

When conductive particles are used, the heat generating ink layer preferably contains a binder resin. Further, when a conductive polymer is used, another resin may be contained for adjusting the conductivity. The resin is not particularly limited as long as it is a material that 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, and the like. 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, ethylcellulose, acetylbutyl Examples thereof include fibrous resins such as cellulose and ethyloxyethyl cellulose, rubber resins such as rubber chloride and cyclized rubber, petroleum resins, and natural resins such as rosin and casein.

In addition to the heat-generating ink for forming the heat-generating ink layer, light stabilizers such as pigments, fillers, stabilizers, plasticizers, antioxidants, and ultraviolet absorbers are used as necessary within a range that does not impair heat generation. , Dispersants, thickeners, desiccants, lubricants, cross-linking agents and the like can be added.

As the solvent contained in the heat-generating ink, a solvent used for ordinary pigment ink can be applied. For example, alcohol-based solvents such as methanol, ethanol, normal propanol, isopropanol, and 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, fats such as cyclohexane, methyl cyclohexane 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 using the above-mentioned heat-generating ink 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.

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 laminating the two laminated films 30 and heat-sealing the vicinity of the opposite edges so that the edges are bonded and sealed. Further, the sealant layer 34 is a layer of the laminated film 30 located on the most accommodating space side (inside) when the bag is made into the pouch 1.
The sealant layer 34 is required to have heat-sealing properties, heat resistance when heated in a microwave oven, impact resistance during transportation and dropping, and the like.

As the sealant layer 34, a film containing a polyolefin resin such as polyethylene, polypropylene, an ethylene-vinyl acetate copolymer, an ethylene-propylene random copolymer, or an ethylene-propylene block copolymer can be adopted. Specifically, it is preferable to use low density polyethylene (LDPE) such as unstretched polypropylene (CPP) and linear low density polyethylene (LLDPE) as the sealant layer 34. By using low density polyethylene (LDPE), impact resistance during transportation and the like can be enhanced. Further, the sealant layer 34 may further contain an olefin-based 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 composed of a plurality of layers. The material and layer composition of each layer can be appropriately changed according to the required specifications such as impact resistance, heat sealability, and easy peeling property.

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 is excellent in impact resistance against dropping that may occur in the distribution process, and is also excellent in handleability such as easy filling of the contents and easy removal of the contents.

[Pattern layer]
In the present embodiment, the pattern layer 32 including the pattern is laminated on the surface of the base material layer 31 on the inner side of 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 on the sealant layer 34 side of the heat generating ink layer 36 from the viewpoint of visually recognizing the heat generating ink layer and ensuring safety during handling. Alternatively, in consideration of the visibility of the pattern layer and the efficiency of transferring the heat generated in the heat-generating ink layer to the sealant layer, a pattern layer is formed on the base material layer, and the heat-generating ink layer is formed on the pattern layer. May be provided.
Further, as a modification of FIG. 2, a configuration in which the heat generating ink layer and the pattern layer are not laminated may be used. In this case, when the laminated film is viewed in a plan view, the heat-generating ink layer and the pattern layer may be formed so as to be adjacent to each other, or the heat-generating ink layer and the pattern layer may be provided apart from each other.

The pattern is a recording object of various modes that can be recorded or printed on the base material layer 31, and includes a wide range of figures, characters, patterns, patterns, symbols, patterns, marks, and the like without particular limitation. In the laminated film 30 used for the pouch 1 intended to contain food, characters indicating information such as a figure of the contents and information such as the product name, the expiration date, the date of manufacture, and the serial number of the contents are used as a pattern. Be done.
The pattern layer 32 may be formed on the entire surface of the base material layer 31, or may be partially formed. The pattern layer 32 is laminated on the base material layer 31 according to the specifications of the product, and the pattern layer 32 may not be provided on the base material layer 31.

In the present embodiment, the pattern layer 32 is formed on the inner surface of the base material layer 31. With such a configuration, the pattern layer 32 is excellent in abrasion resistance, so that it can be effectively prevented from disappearing due to rubbing or the like, and falsification of the pattern can also be effectively prevented.

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, petals and cadmium. Colored inorganic pigments such as red, ultramarine blue and cobalt blue; chromatic organic pigments such as quinacridone red, isoindolinone yellow and phthalocyanine blue; brilliant materials such as pearl pigments, metal particles and metal scales; dyes and the like. One or more of these can be used.

The pattern layer can be formed 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 made of a binder resin or a solvent as a main component.

Examples of the binder resin 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 Based resin, unsaturated polyester based resin, thermocurable poly (meth) acrylic resin, melamine based resin, urea resin, polyurethane resin, phenol resin, xylene resin, maleic acid resin, nitrocellulose, ethyl cellulose, acetyl Examples thereof include fibrous resins such as butyl cellulose and ethyloxyethyl cellulose, rubber resins such as rubber chloride and cyclized rubber, petroleum resins, and natural resins such as rosin and casein.

Further, if necessary, the pattern layer forming ink includes a light stabilizer such as a filler, a stabilizer, a plasticizer, an antioxidant, an ultraviolet absorber, a dispersant, a thickener, a desiccant, a lubricant, and the like. Any additive such as an antistatic agent and a cross-linking agent can be added.

As the solvent contained in the ink of the pattern layer, a solvent used for ordinary pigment ink can be applied, for example, an alcohol solvent such as methanol, ethanol, normal propanol, isopropanol, propylene glycol monomethyl ether, acetone or methyl ethyl ketone. , Ketone solvents such as methyl isobutyl ketone, ester solvents such as methyl acetate, ethyl acetate, normal propyl acetate, aliphatic hydrocarbon solvents such as normal hexane, normal heptane, normal octane, cyclohexane, methyl cyclohexane, cycloheptane, etc. Examples thereof 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 colorant in the pattern layer is not particularly limited, but 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. It is more preferably ~ 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 material layer 33 between the base material layer 31 and the sealant layer 34. The intermediate base material layer 33 is provided to supplement various functions required for a pouch for a microwave oven.
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 stored while preventing deterioration such as oxidation of the content. It may have a gas barrier property that prevents the permeation of gas such as oxygen gas and oxygen gas. In addition, the standing pouch type pouch 1 is displayed on the product shelf of the sales floor in a self-standing state. For this reason, the intermediate base material layer 33 may have bending resistance and impact resistance so that the pouch 1 can sufficiently withstand the impact when it is dropped from the product shelf. Further, the intermediate base material layer 33 may have a function of sufficiently enhancing the concealing property so that the contents of the pouch 1 cannot be seen in order to increase the purchasing motivation of the consumer.

Examples of the intermediate base material layer 33 having such a function include polyolefins such as polyethylene terephthalate, polyamide, polyethylene and polypropylene, nylon, polyvinyl chloride, polycarbonate, polyvinyl alcohol, ethylene-propylene copolymer and ethylene-vinyl acetate. A film such as a polymer saponified product can be used. As the above-mentioned film, a film on which an inorganic substance such as silicon oxide or aluminum oxide is vapor-deposited, or a film on which a coating film of an ethylene-vinyl alcohol copolymer is formed may be used.
The intermediate base material layer 33 may be composed of one of the films listed above, or may be used in combination of two or more.

As shown in FIG. 2, in the present embodiment, the 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 the bonding layer 35, an adhesive generally used in a dry laminating method known per se can be used. For example, polyvinyl acetate adhesives, polyacrylic acid ester adhesives, cyanoacrylate adhesives, ethylene copolymer adhesives, cellulose adhesives, polyester adhesives, polyamide adhesives, amino resin adhesives. , An epoxy-based adhesive, a polyurethane-based adhesive, or the like can be used.

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

[Seal part]
The sealing portion 50 is formed by heat-sealing the vicinity of the peripheral edge 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 accommodation space 2 and seals the accommodation space 2.

Hereinafter, the form of the seal portion in the pouch of the present invention will be described with reference to an example.
<First Embodiment>
In the pouch according to the first embodiment, as shown in FIG. 1, the outer edge 50a of the sealed portion 50 extends in a circumferential shape along the edges 12 to 14 of the sheet 11 and the edges of the unsealed portion 60. .. On the other hand, the inner edge 50b of the seal portion 50 extends in a circumferential shape while being spaced 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 lateral direction d1, and an upper seal located opposite to each other in the vertical direction d2 orthogonal to the lateral direction d1. A portion 53 and a lower seal portion 54 are included. In other words, the lateral direction d1 is the arrangement direction of the first side seal portion 51 and the second side seal portion 52, and the vertical direction d2 is the direction orthogonal to the arrangement direction.

The side seal portions 51 and 52 are heat-sealed in the vicinity of the side edges 13 of the 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 a region in the vicinity of the side edge 13 of the sheets where the two sheets 11 are not heat-sealed. The unsealed portion 60 is isolated from the accommodation space 2 by the corresponding side side sealing portion (first side sealing portion 51 in FIG. 1).
The unsealed portion 60 is provided to communicate with the accommodation space 2 and allow the steam in the pouch 1 to escape to the outside when the pressure in the pouch 1 is increased by the steam generated by heating by the microwave oven. .. The unsealed portion 60 reaches the side edge 13 of the sheet 11 (laminated film 30) and is opened. That is, the unsealed portion 60 has an opening 61 at the side edge 13 of the sheet 11. As shown in FIG. 1, the unsealed portion 60 isolates the first side sealed portion 51 into an upper sealed portion 56 and a lower sealed portion 57. The unsealed portion 60 projects closer to the accommodation space 2 than the upper sealed portion 56 and the lower sealed portion 57. As a result, the overhanging seal portion 55 is formed on the side seal portion.

The unsealed portion 70 is provided to compensate the unsealed portion 60 to form an opening 61 at the side edge 13 of the sheet 11 when the pouch 1 is manufactured. That is, the unsealed portion 70 is provided to increase 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 at the side edge 13 of the sheet 11. The unsealed portion 70 does not necessarily have to be provided.

FIG. 3 is an enlarged view of the first side sealed portion in the vicinity of the unsealed portion in the pouch according to the first embodiment. As shown in FIG. 3, the first side seal portion 51 surrounds the upper seal portion 56 and the lower seal portion 57 located on both sides of the unsealed portion 60, and at least a part of the unsealed portion 60. It is connected to the upper seal portion 56 and the lower seal portion 57, and includes an overhang seal portion 55 that protrudes from the upper seal portion 56 and the lower seal portion 57 toward the accommodation space 2. .. 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. As shown in FIG. 3, the upper sealed portion 56, the unsealed portion 60, and the lower sealed portion 57 are arranged in the first direction (corresponding to the vertical direction d2 in FIG. 3).

In FIGS. 1 and 3, the width of the upper seal portion 56 (the width in the direction from the accommodation space 2 toward the outside of the pouch) is made larger than the width of the lower seal portion 57. This is a configuration in consideration of handleability when opening from a notch, which will be described later, after heating. However, the present invention is not limited to this, and 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 FIGS. 1 and 3, in the first side seal portion 51, the inner edge 50b of the seal portion 50 is the inner edge 21 of the upper seal portion 56, the inner edge 22 of the overhanging seal portion, and the lower seal portion 57. Includes the inner edge 23 of.

As shown in FIG. 3, the overhanging seal portion 55 extends from the upper sealing portion 56 along the lateral direction d1 and the upper overhanging region 55a extending from the lower sealing portion 57 along the lateral direction d1. The lower overhang region 55b and the middle overhang region 55c interposed between the upper overhang region 55a and the lower overhang region 55b are included. In the example shown in FIG. 3, the overhanging region 55c extends along the vertical direction d2 at a position between the unsealed portion 60 and the accommodation space 2. The middle overhang region 55c is connected to the upper overhang region 55a via the upper angle region 55d, and is connected to the lower overhang region 55b via the lower angle region 55e.

The upper corner region 55d projects toward the accommodation space 2 side at a position closer to the upper seal portion 56 than the lower seal portion 57, and the lower corner region 55e is a lower seal portion 57 than the upper seal portion 56. It protrudes toward the accommodation space 2 side at a position close to. In the example shown in FIG. 3, the upper angle region 55d and the lower angle region 55e have a fan shape having a central angle of 90 ° in a plan view. That is, the shape of the overhanging seal portion 55 is a rectangle in which the corner portion on the accommodation space 2 side is fan-shaped when viewed in a plan view.
In addition, the plan view means to see the pouch 1 from a direction orthogonal to both the horizontal direction d1 and the vertical direction d2 in the drawing.

In the first embodiment, the size of the overhanging seal portion (the lengths of the upper overhanging area 55a, the lower overhanging area 55b, and the middle overhanging area 55c) is not particularly limited. However, the size of the overhanging seal portion takes into consideration the volume of the accommodation space 2, that it does not become an obstacle when filling the contents, and the size of the communication area with the unsealed portion when it is ventilated. 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 the periphery of the opening 61 toward the accommodation space 2, and the tip of the first edge 63. Includes a third edge 65 that extends between the and the tip of the second edge 64. In the illustrated example, the first edge portion 63 is arranged on the upper edge 12 side of the sheet 11, and the second edge portion 64 is arranged on the lower edge 14 side of the sheet 11.

As shown in FIG. 3, the first edge portion 63 and the second edge portion 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 portion 63 is equal to the length of the second edge portion 64. Therefore, when the third edge portion 65 extends linearly between the tip of the first edge portion 63 and the tip of the second edge portion 64, the third edge portion 65 extends in parallel with the vertical direction d2 and is second. It is orthogonal to the first edge portion 63 and the second edge portion 64. In this case, the unsealed portion 60 is rectangular.

As shown in FIGS. 1 and 3, a notch 7 that can serve as a starting point at the time of opening is formed in the upper seal portion 56. The position where the notch 7 is provided is the planned opening position when the pouch 1 is opened in order to take out the contents accommodated in the accommodation space 2. The notch 7 penetrates the sheet 11. The notch 7 may be a cut formed in the upper seal portion 56, or may be a notch having a predetermined width. Since the notch 7 is formed in the upper seal portion 56, the pouch 1 can be easily opened from the notch 7.
The notch 7 is preferably provided on at least one of the first side seal portion 51 and the second side seal portion 52. For example, as shown in FIG. 1, the notch 7 may be provided not only in the first side seal portion 51 but also in the second side seal portion 52. In this case, it is preferable that the positions where the two notches 7 are formed are substantially the same height in the vertical direction d2 of the pouch 1.
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 easy-opening means known per se can be provided. As another easy-opening means, there is an example of providing a plurality of fine small holes.

In the present embodiment, the heat-generating ink layer accommodates (1) at least a part of the overhanging seal portion 55 and (2) the upper seal portion 56 and the lower seal portion 57 within the region of the unsealed portion 60. (3) It is continuously provided between at least a part of the region located on the opening 61 side of the inner edges 21 and 23 on the space 2 side. The shape (coating pattern) of the heat-generating ink layer is not particularly limited as long as the heat-generating ink layer is formed so as to satisfy the above conditions (1) to (3) and the effects described later are exhibited.

In FIG. 3, the area where the heat generating ink layer is provided is indicated by diagonal lines. In the example shown in FIG. 3, the heat generating ink layer is provided on (1) the entire overhanging seal portion and (2) the entire unsealed portion 60. The heat-generating ink layer provided in the unsealed portion 60 is provided so as to reach the opening 61. The heat-generating ink layer provided on the overhanging seal portion 55 and the heat-generating ink layer provided on the entire unsealed portion 60 are continuous.

FIG. 4 is a diagram illustrating a modified example of the first embodiment, and is an example in which a heat generating ink layer is provided in a part of the unsealed portion 60. In FIG. 4, the same components as those in FIG. 3 are designated by the same reference numerals. In FIG. 4, the area where the heat generating ink layer is provided is shown by diagonal lines.
In the example shown in FIG. 4, the heat generating ink layer is provided in the region of the unsealed portion 60 so as to extend from the third edge portion 65 in the lateral direction d1 toward the opening 61, but the opening 61 It differs from FIG. 3 in that it has not reached. That is, in FIG. 4, the heat generating ink layer is provided in a region of the upper seal portion 56 and the lower seal portion 57 located on the opening 61 side of the inner edges 21 and 23 on the accommodation space 2 side. Further, in FIG. 4, the heat generating ink layer is provided over the entire width of the unsealed portion 60 in the vertical direction d2 (first direction).

It is preferable that the heat generating ink layer is not substantially provided on the upper seal portion 56 and the lower seal portion 57. "Substantially not provided" means that the heat-generating ink layer is also formed on the upper seal portion 56 and the lower seal portion 57 due to manufacturing misalignment such as printing misalignment or seal misalignment of the heat-generating ink layer (in production). Tolerance). Specifically, the allowable width of the heat-generating ink layer formed on the upper seal portion 56 is within 2 mm from the first edge portion 63 of the unsealed portion 60, and from the upper seal portion 56 side end portion of the overhanging region 55a. It is within 2 mm. The permissible width of the heat-generating ink layer formed on the lower seal portion 57 is within 2 mm from the second edge portion 64 of the unsealed portion 60 and within 2 mm from the lower seal portion 57 side end portion of the underhanging region 55b. Is.

In the aspects of FIGS. 3 and 4, the heat-generating ink layer of the unsealed portion 60 is formed so as to cover the entire length of the third edge portion 65 in the vertical direction d2, but the present embodiment is not limited to this. .. If the heat-generating ink layer of the unsealed portion 60 is continuous with the heat-generating ink layer of the overhanging seal portion 55, for example, the heat-generating ink layer of the unsealed portion 60 is coated so that the heat-generating ink layer is not formed in the vicinity of the first edge portion 63 and the second edge portion 64. It can also be a pattern (see FIG. 6).

In the present embodiment, as described above, the heat generating ink layer is formed on the entire overhanging seal portion 55. Therefore, when the microwave oven is heated, the overhanging seal portion 55 in the region where the heat-generating ink layer is provided is heated by the conductive polymer and the conductive particles in the heat-generating ink. As a result, the bonding force of the sheet 11 at the overhanging seal portion 55 decreases relatively early after heating in the microwave oven.
The accommodation space 2 that expands with heating can be regarded as expanding from the vicinity of the center of the pouch 1. Therefore, the pressure applied to the seal portion 50 depends on the distance from the vicinity of the center of the pouch 1, and the closer the seal portion 50 is to the vicinity of the center of the pouch 1, the stronger the load due to steam is applied to the seal portion 1. That is, the overhanging seal portion 55 is subjected to a higher load than the other seal portions. When the pressure in the accommodation space 2 increases due to the heating in the microwave oven, the sheet 11 peels off in the entire overhanging seal portion 55 where the bonding force is 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.
As described above, the pouch of the present embodiment can reliably release the steam in the accommodation space 2 from the overhanging seal portion 55 when the microwave oven is heated. The pouch of the present embodiment can generate steam escape even when containing contents having a small amount of steam generated.

In the present embodiment, the heat-generating ink layer is provided in the unsealed portion 60 so as to be continuous with the heat-generating ink layer of the overhanging seal portion 55. The heat-generating ink layer is located in the region of the unsealed portion 60 on the opening 61 side of the inner edge 21 of the upper seal portion 56 on the accommodation space 2 side and the inner edge 23 of the lower seal portion 57 on the accommodation space 2 side. It is provided in the area to be used. By forming the heat-generating ink layer in this way, the heat generated in the heat-generating ink layer of the unsealed portion 60 is transferred to the overhanging seal portion 55, and the sheet 11 is more efficiently peeled off at the overhanging sealing portion 55. Can be made to. In particular, in the case of heating using a flat table type microwave oven, when the pouch 1 is heated in an upright state, microwaves reach the heat-generating ink layer formed on the overhanging seal portion 55 due to the moisture contained in the contents. On the other hand, in the unsealed portion 60, the microwave is not obstructed by the contents in the region located on the opening side of the inner edge 21 of the upper seal portion 56 and the edge portion 23 of the lower seal portion 57. For example, as shown in FIGS. 1 and 3, a pouch in which the width of the lower seal portion 57 is smaller than the width of the upper seal portion 56 is erected so that the lower seal portion 57 is below the upper seal portion 56. When heated in this state, the heat-generating ink layer can absorb microwaves and generate heat in a region of the unsealed portion 60 located closer to the opening 61 than the edge portion 23. The pouch of the present embodiment is advantageous in that the overhanging seal portion 55 can be heated through the heat generating ink layer of the unsealed portion 60, and the peeling of the sheet 11 at the overhanging seal portion 55 can proceed.
As described above, the pouch 1 of the present embodiment can surely generate steam escape regardless of the heating method of the microwave oven used.

Further, even when heating in a turntable type microwave oven, by providing the heat-generating ink layer in the unsealed portion 60, a sufficient heat-generating ink layer area can be secured, and the overhanging seal portion 55 can be efficiently used. The peeling of the sheet 11 can proceed.

When heat-sealed under the same conditions, the bonding force at any one point in the sealing portion 50 is designed to be equal to the bonding force at the other point. However, the bonding force may be distributed in the sealing portion 50 during heat sealing. If the heat-generating ink layer is not provided, when the pressure in the accommodation space rises due to heating in the microwave oven, there is a possibility that the seal retracts at the seal portion having a weak bonding force other than the overhanging seal portion. By forming the heat-generating ink layer on the overhanging seal portion 55 as in the present embodiment, the bonding force of the sheet 11 at the overhanging sealing portion 55 can be reduced, so that the sealing retreat in other sealing portions can be prevented. It also has the effect of being able to suppress it.
Since the seal retreat can be suppressed in this way, in the pouch of the present embodiment, the width of the seal portion 50 can be made smaller than before. Specifically, the width of the seal portion 50 can be about 4 mm. As a result, the size of the bag can be reduced. Alternatively, the volume of the accommodation space can be increased by making the outer circumference the same size.

FIG. 5 is a modified example of the pouch according to the first embodiment, and is an enlarged view of the first side sealed portion in the vicinity of the unsealed portion. In FIG. 5, the same reference numerals are given to the configurations common to those in FIG. In FIG. 5, the area where the heat generating ink layer is provided is shown by diagonal lines.

In FIG. 5, heat-generating ink layers are provided in (1) all of the overhanging region 55c and (2) the entire unsealed portion 60. The heat-generating ink layer provided in the middle overhanging region 55c and the heat-generating ink layer provided in the entire unsealed portion 60 are continuous.
If the heat-generating ink layer provided in the unsealed portion 60 is provided in a region located on the opening 61 side of the inner edges 21 and 23, it is not provided so as to reach the opening 61 as shown in FIG. You may.

FIG. 6 is a modified example of the pouch according to the first embodiment, and is an enlarged view of the first side sealed portion in the vicinity of the unsealed portion. In FIG. 6, the same reference numerals are given to the configurations common to those in FIG. In FIG. 6, the area where the heat generating ink layer is provided is indicated by diagonal lines.

In FIG. 6, the heat-generating ink layer is continuously provided between (1) a part of the overhanging region 55c and (2) a part of the unsealed portion 60.
(1) The heat-generating ink layer provided in the middle overhanging region 55c is provided in the region including the center in the vertical direction d2 (first direction) of the overhanging seal portion. In FIG. 6, a heat generating ink layer is provided so as to be symmetrical with respect to the center line X in the vertical direction of the overhanging seal portion.
(2) The heat-generating ink layer provided in the unsealed portion 60 extends in the lateral direction d1 with the same width as the length of the heat-generating ink layer (width in the direction corresponding to the vertical direction d2) in the central overhanging region 55c, and the opening 61 Has reached. The heat-generating ink layer of the unsealed portion 60 does not reach the first edge portion 63 and the second edge portion 64. If the heat-generating ink layer provided in the unsealed portion 60 is provided in a region located on the opening 61 side of the inner edges 21 and 23, it is not provided so as to reach the opening 61 as shown in FIG. You may.

In the aspects of FIGS. 5 and 6, the width of the heat-generating ink layer of the unsealed portion 60 and the length (width in the vertical direction) of the heat-generating ink layer of the overhanging region 55c do not necessarily have to be the same.

By being provided in a region including the center in the first direction, which is a part of the overhanging seal portion 55, it is possible to limit the portion where the sheet is peeled off when heated in a microwave oven. In the case of FIGS. 5 and 6, peeling occurs in the middle overhanging region 55c, and the sealed state can be maintained in the upper overhanging region 55a and the lower overhanging region 55b. Therefore, when the contents become liquid by heating and boil, not only the contents that spring up from the lower side but also the contents that reach the upper part of the accommodation space 2 (the upper seal portion 53 when the pouch is erected). , It is possible to prevent the pouch 1 from being ejected to the outside. Further, since the communication portion with the outside of the pouch 1 is small, it is possible to prevent the contents from leaking from the peeled portion when, for example, the pouch is taken out from the inside of the refrigerator after cooking. Further, even after the sheet is peeled off by heating, the shape of the overhanging seal portion is maintained and the appearance can be maintained.

When the heat-generating ink layer is provided in a region including the center of the overhanging seal portion in the first direction, the length of the overhanging seal portion 55 in the first direction is L1, and the heat-generating ink layer formed on the heat-generating seal portion 55. When the length in the first direction is L2, L2 / L1 is preferably 0.10 to 0.95, and more preferably 0.30 to 0.80. When L2 / L1 is in the above range, when heated in a microwave oven, steaming due to peeling of the sheet is surely generated, and the place where the sheet is peeled can be restricted, so that the contents can be effectively ejected. It can also be suppressed.

As shown in FIGS. 3 to 6, the heat-generating ink layer is preferably provided so as to reach the inner edge 22 on the accommodation space 2 side of the overhanging seal portion 55. By doing so, the bonding force of the sheets 11 in the vicinity of the inner edge 22 of the overhanging seal portion 55 can be reliably reduced, and the sheets 11 can be peeled off due to an increase in the internal pressure in the accommodation space 2 when the microwave oven is heated. it can.

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 calorific value depends on the coating area particularly when the pouch 1 is viewed in a plan view. The coating area is appropriately set in consideration of the peelability of the overhanging seal portion, the manufacturing cost, and the like.

The heat-generating ink layer may be provided in a part of the accommodation space 2 beyond the overhanging seal portion 55 when the pouch 1 is viewed in a plan view. By doing so, the overhanging seal portion can be heated so that the bonding force of the sheet 11 is sufficiently reduced, and production tolerances such as printing misalignment and seal misalignment of the heat-generating ink layer can be tolerated. it can. On the other hand, if the area of the heat-generating ink layer formed in the accommodation space 2 becomes large, the overhanging seal portion 55 may be excessively heated, causing thermal damage such as shrinkage or tearing of the film. In addition to increasing the production cost, the heat-generating ink layer may be conspicuous and the design may be deteriorated. Considering the above, it is preferable that the heat-generating ink layer formed in the accommodation space 2 is formed in a region of 5 mm or less from the inner edge 22 of the overhanging seal portion 55.

When the width of the overhanging seal portion 55 (the width in the direction from the accommodation space 2 side toward the unsealed portion 60) is wide, the heat generated in the heat generating ink layer of the unsealed portion 60 is dispersed in the overhanging seal portion 55. In some cases, the bonding force of the sheet cannot be sufficiently reduced. In addition, the overhanging seal portion may become large and the volume of the accommodation space 2 may become small. In order to cause peeling at the overhanging seal portion 55 more efficiently, the widths of the upper overhanging region 55a, the lower overhanging region 55b, and the middle overhanging region 55c are preferably 2 mm to 8 mm, respectively. More preferably, it is 3 mm to 5 mm.

For example, if the area of the unsealed portion and the region (region A) located on the opening side of the upper sealed portion and the lower sealed portion on the accommodation space side is too small, the unsealed portion 60 will be used. Since the amount of heat generated is small, the overhanging seal portion 55 cannot be sufficiently heated, and peeling may not occur at the overhanging seal portion 55. Therefore, the area of the heat generating ink layer formed on the aforementioned region A of the unsealed portions in a plan view of the pouch ^is preferably ^{0.3cm 2 ~2.5cm 2, 0.5cm 2 ~1} . It is more preferably 5 cm ^2.

Further, the heat-generating ink layer may be solidly coated in the area to be coated, or may be coated in a pattern such as a grid pattern.

<Second Embodiment>
7 to 9 are enlarged views of the first side sealed portion in the vicinity of the unsealed portion in the pouch according to the second embodiment. In FIGS. 7 to 9, the same reference numerals are given to the configurations common to those in FIGS. Further, the same reference numerals are given to the common configurations in FIGS. 7 to 9.

The second embodiment is the same as the first embodiment except for the shapes of the overhanging sealed portion and the unsealed portion.
The overhanging seal portions 155 and 156 of FIGS. 7 and 8 are trapezoidal in which the two internal angles on the upper seal portion 56 and the lower seal portion 57 side are substantially right angles when viewed in a plan view. The upper corner region 155d and the lower corner region 155e on the accommodation space 2 side of the overhanging seal portions 155 and 156 are fan-shaped when viewed in a plan view. FIG. 7 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. 8 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. 9 is an equiangular trapezoid when viewed in a plan view.

7 to 9 are examples, and if the overhanging seal portion is trapezoidal, the size of the overhanging seal portion (the lengths of the upper overhanging area 155a, the lower overhanging area 155b, and the middle overhanging area 155c, respectively. The angle between the upper angle region 155d and the lower angle region 155e) is not particularly limited. However, the size of the overhanging seal portion takes into consideration the volume of the accommodation space 2, that it does not become an obstacle when filling the contents, and the size of the communication area with the unsealed portion when it is ventilated. Set as appropriate.

In FIGS. 7 to 9, the width of the upper seal portion 56 and the width of the lower seal portion 57 are written to be equal, but the present embodiment 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 handleability after heating in the microwave oven.

In the second embodiment, the shape of the unsealed portion 160 is not particularly limited. In FIGS. 7 to 9, a trapezoidal unsealed portion 160 is illustrated. As shown in FIGS. 7 to 9, the unsealed portion 160 may substantially match the shape of the overhanging seal portion, or may differ from the shape of the overhanging sealing portion.

Taking FIG. 7 as an example, when the unsealed portion has a trapezoidal shape in which the two internal angles are substantially right angles, the edge portion 162 of the unsealed portion 160 extends from around the opening 61 toward the accommodation space 2. It includes a first edge portion 163 and a second edge portion 164, and a third edge portion 165 extending between the tip of the first edge portion 163 and the tip of the second edge portion 164. The first edge portion 163 and the second edge portion 164 extend linearly in the lateral direction d1, and the length of the first edge portion 163 is shorter than the length of the second edge portion 164. The third edge portion 165 is a hypotenuse extending diagonally with respect to the vertical direction d2.

Taking FIG. 9 as an example, when the unsealed portion has an equiangular trapezoidal shape, the edge portion 162 of the unsealed portion 160 extends from the circumference of the opening 61 toward the accommodation space 2, and the first edge portion 163 and the first edge portion 162. It includes a two edge portion 164 and a third edge portion 165 extending between the tip of the first edge portion 163 and the tip of the second edge portion 164. The third edge portion 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 that in the first embodiment. That is, (1) at least a part of the overhanging seal portion 155, 156, 157, and (2) within the region of the unsealed portion 160, on the accommodation space 2 side of the upper seal portion 56 and the lower seal portion 57. (3) It is continuously provided between at least a part of the region located on the opening 61 side of the inner edges 21 and 23. FIGS. 7 to 9 are examples for explaining the invention, and if the heat-generating ink layer is formed so as to satisfy the above conditions (1) to (3) and the effects described later are exhibited, the heat-generating ink layer is obtained. The shape (coating pattern) of the above is not particularly limited.

In FIGS. 7 to 9, the heat generating ink layer is continuously provided between (1) a part of the overhanging region 155c and (2) a part of the unsealed portion 160. In FIGS. 7 to 9, the area where the heat generating ink layer is provided is shown by diagonal lines.
(1) The heat-generating ink layer provided in the overhanging region 155c is the center of the overhanging seal portion 155 in the vertical direction d2 (first direction) (the center lines of the overhanging seal portions 155, 156, 157 in FIGS. 7 to 9). It is provided in the area containing) (indicated by X).
(2) The heat-generating ink layer provided in the unsealed portion 160 extends in the lateral direction d1 with the same width as the length of the heat-generating ink layer (width in the direction corresponding to the vertical direction d2) in the middle overhanging region 155c, and the opening 61 Has reached. Therefore, the heat-generating ink layer of the unsealed portion 160 does not reach the first edge portion 163 and the second edge portion 164.

As shown in FIGS. 7 to 9, by providing the overhanging seal portion 155, 156, 157 in a region including the center in the first direction, the overhanging region 155c can be heated in a microwave oven. The sheet 11 is peeled off in the region where the heat-generating ink layer is formed, and steam can be released to the outside of the pouch.
In the configurations of FIGS. 7 to 9, the position where the sheet is peeled off is limited, and the sealed state can be maintained in the upper overhanging region 155a and the lower overhanging region 155b. Therefore, when the contents become a liquid by heating and boil, not only the contents that spring up from the lower side but also the contents that reach the upper part of the accommodation space 2 are prevented from being ejected to the outside of the pouch 1. Can be done. Further, since the communication portion with the outside of the pouch 1 is small, it is possible to prevent the contents from leaking from the peeled portion when, for example, the pouch is taken out from the inside of the refrigerator after cooking. Further, even after the sheet is peeled off by heating, the shape of the overhanging seal portion is maintained and the appearance can be maintained.

The heat-generating ink layer provided in the unsealed portion 160 is provided so as to reach the opening 61 as shown in FIGS. 7 to 9 if it is provided in a region located on the opening 61 side of the inner edges 21 and 23. It does not have to be.

Further, the width of the heat-generating ink layer of the unsealed portion 160 and the length (width in the vertical direction) of the heat-generating ink layer of the overhanging region 155c do not necessarily have to be the same. For example, the heat-generating ink layer of the unsealed portion 160 may be provided wider than the length of the heat-generating ink layer of the middle overhanging region 150c so as to reach the first edge portion 163 and the second edge portion 164.

7 to 9 show an example in which the heat generating ink layer is provided on a part of the overhanging seal portion 155, 156, 157, but in the present embodiment, the heat generating ink layer is provided on the entire surface of the overhanging seal portion 155, 156, 157. You may have.

As described in the first embodiment, the heat-generating ink layer may be provided so as to reach the inner edge 22 on the accommodation space 2 side in the overhanging seal portions 155, 156, 157. With such a configuration, the bonding force of the sheet 11 in the vicinity of the inner edge 22 of the overhanging seal portions 155, 156, 157 can be surely reduced, and the internal pressure in the accommodation space 2 rises due to the heating in the microwave oven. The sheets 11 can be peeled off.

Further, as shown in FIGS. 7 to 9, in order to sufficiently heat the sheet 11 of the overhanging seal portions 155, 156, and 157 and to allow production tolerances, the heat generating ink layer is a plan view of the pouch 1. Occasionally, it may be provided in a part of the accommodation space 2 beyond the overhanging seal portion 155. In this case, the end portion of the heat generating ink layer on the accommodation space 2 side may have a shape that follows the inner edge 22 of the overhanging seal portion 155, or may have a different shape. Similar to the first embodiment, the heat generating ink layer formed in the accommodation space 2 is preferably formed in a region of 5 mm or less from the inner edge 22 of the overhanging seal portions 155, 156, 157.

<Third Embodiment>
10 to 12 are enlarged views of the first side sealed portion in the vicinity of the unsealed portion in the pouch according to the third embodiment. In FIGS. 10 to 12, the same reference numerals are given to the configurations common to those in FIGS. Further, the same reference numerals are given to the common configurations in FIGS. 10 to 12.

The third embodiment is the same as the first embodiment except for the shapes of the overhanging sealed portion and the unsealed portion.
The overhanging seal portion 255 in FIG. 10 is a right triangle whose hypotenuse is located below the corner region when viewed in a plan view. The overhanging seal portion 256 of FIG. 11 is a right triangle whose hypotenuse is located above the corner region when viewed in a plan view. The overhanging seal portion 257 of FIG. 12 is an equilateral triangle when viewed in a plan view.

The overhanging seal portions 255, 256, 257 of the third embodiment have an upper overhanging region 255a extending from the upper sealing portion 56 to the accommodation space 2 side on the upper sealing portion 53 side, and a lower side on the lower sealing portion 54 side. It includes a lower overhanging region 255b extending from the seal portion 57 toward the accommodation space 2 side, and a square region 255c connecting the upper overhanging region 255a and the lower overhanging region 255b. The angular region 255c has a fan shape.
10 to 12 are examples, and if the overhanging seal portion in the third embodiment is triangular, the size and shape of the overhanging seal portion (the lengths of the upper overhang region 255a and the lower overhang region 255b). , The angle of the angular region 255c) is not particularly limited. However, the size of the overhanging seal portion takes into consideration the volume of the accommodation space 2, that it does not become an obstacle when filling the contents, and the size of the communication area with the unsealed portion when it is ventilated. Set as appropriate.

In the third embodiment, the shape of the unsealed portion 260 is not particularly limited. In FIGS. 10 to 12, a triangular unsealed portion 260 is illustrated. As shown in FIGS. 10 to 12, the unsealed portion 260 may substantially match the shape of the overhanging seal portion, or may differ from the shape of the overhanging seal portion.

Taking FIG. 10 as an example, when the unsealed portion is triangular, the edge portion 262 of the unsealed portion 260 extends from the circumference of the opening 61 toward the accommodation space 2, and the first edge portion 263 and the second edge. The ends of the first edge portion 263 and the second edge portion 264, including the portion 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 that in the first embodiment. That is, (1) at least a part of the overhanging seal portion 155 and (2) inner edges 21 and 23 on the accommodation space 2 side of the upper seal portion 56 and the lower seal portion 57 within the region of the unsealed portion 160. (3) It is continuously provided between at least a part of the region located closer to the opening 61. 10 to 12 are examples for explaining the invention, and if the heat-generating ink layer is formed so as to satisfy the above conditions (1) to (3) and the effects described later are exhibited, the heat-generating ink The shape of the layer (coating pattern) and the like are not particularly limited.

In FIGS. 10 to 12, the area where the heat generating ink layer is provided is shown by diagonal lines.
In FIG. 10, the heat-generating ink layer is continuously provided between (1) a part of the underhanging region 255b and (2) a part of the unsealed portion 260.
(1) The heat-generating ink layer provided in the underhanging region 255b has a center (the center line X of the overhanging seal portion 255 is shown in FIG. 10) in the vertical direction d2 (first direction) of the overhanging seal portion 255. It is provided in the including area.
(2) The heat-generating ink layer provided in the unsealed portion 260 extends in the lateral direction d1 with the same width as the length in the direction corresponding to the vertical direction d2 of the heat-generating ink layer in the underhanging region 255b, and reaches the opening 61. There is. Therefore, the heat-generating ink layer of the unsealed portion 260 does not reach the first edge portion 263. Further, on the second edge portion 264 side, the heat generating ink layer is not formed in the unsealed portion 260 in the vicinity of the opening 61.

In FIG. 11, the heat-generating ink layer is continuously provided between (1) a part of the overhanging region 255a of the overhanging seal portion 256 and (2) a part of the unsealed portion 260.
(1) The heat-generating ink layer provided in the overhanging region 255a has a center (the center line X of the overhanging seal portion 256 is shown in FIG. 11) in the vertical direction d2 (first direction) of the overhanging seal portion 256. It is provided in the including area.
(2) The heat-generating ink layer provided in the unsealed portion 260 extends in the lateral direction d1 with the same width as the width in the direction corresponding to the vertical direction d2 of the heat-generating ink layer in the overhanging region 255a, and reaches the opening 61. There is. Therefore, the heat-generating ink layer of the unsealed portion 260 does not reach the second edge portion 264. Further, on the first edge portion 263 side, the heat generating ink layer is not formed in the unsealed portion 260 in the vicinity of the opening 61.

In FIG. 12, the heat-generating ink layer includes a part of the upper overhanging region 255a and a part of the lower overhanging region 255b so as to include (1) the center of the overhanging seal portion 257 in the vertical direction d2 (first direction). , (2) It is continuously provided between a part of the unsealed portion 260 and the unsealed portion 260.
(1) The heat-generating ink layer provided in the overhanging region 255a has a center (the center line X of the overhanging seal portion 257 is shown in FIG. 12) in the vertical direction d2 (first direction) of the overhanging seal portion 257. It is provided in the including area.
(2) The heat-generating ink layer provided in the unsealed portion 260 extends in the lateral direction d1 with the same width and width as the heat-generating ink layer provided in the upper overhanging region 255a and the lower overhanging region 255b, and reaches the opening 61. ing. Therefore, the heat-generating ink layer of the unsealed portion 260 does not reach the first edge portion 263 and the second edge portion 264 in the vicinity of the opening 61.

As shown in FIGS. 10 to 12, the overhanging seal portion 255, 256, 257 is provided in a region including the center in the first direction, so that the overhanging seal portion 255, when heated in a microwave oven, is provided. The sheet 11 is peeled off in the region where the heat generating ink layer of 256 and 257 is formed, and steam can be released to the outside of the pouch.
In the configuration of FIGS. 10 to 12, the portion where the sheet is peeled off can be limited, and the sealed state can be maintained at the overhanging seal portion where the heat generating ink layer is not provided. Therefore, when the contents become a liquid by heating and boil, not only the contents that spring up from the lower side but also the contents that reach the upper part of the accommodation space 2 are prevented from being ejected to the outside of the pouch 1. Can be done. Further, since the communication portion with the outside of the pouch 1 is small, it is possible to prevent the contents from leaking from the peeled portion when, for example, the pouch is taken out from the inside of the refrigerator after cooking. Further, even after the sheet is peeled off by heating, the shape of the overhanging seal portion is maintained and the appearance can be maintained.

If the heat-generating ink layer provided in the unsealed portion 260 is provided in a region located on the opening 61 side of the inner edges 21 and 23, it is not provided so as to reach the opening 61 as shown in FIGS. 10 to 12. You may.

Further, the width of the heat-generating ink layer of the unsealed portion 260 and the length (width in the vertical direction) of the heat-generating ink layer of the overhanging seal portions 255, 256, 257 do not necessarily have to be the same. For example, the heat generating ink layer may be provided on the entire surface of the unsealed portion 260.

Although FIGS. 10 to 12 show an example in which the heat generating ink layer is provided on a part of the overhanging seal portion 255, 256, 257, in the present embodiment, the heat generating ink layer is provided on the entire surface of the overhanging seal portion 255, 256, 257. You may.

As described in the first embodiment, the heat-generating ink layer may be provided so as to reach the inner edge 22 on the accommodation space 2 side in the overhanging seal portion 255. With such a configuration, the bonding force of the sheet 11 in the vicinity of the inner edge 22 of the overhanging seal portions 255, 256, 257 can be surely reduced, and the internal pressure in the accommodation space 2 rises due to the heating in the microwave oven. The sheets 11 can be peeled off.

Further, in order to sufficiently heat the sheet 11 of the overhanging seal portions 255, 256, 257 and tolerate production tolerances, as shown in FIGS. 10 to 12, the heat generating ink layer is a plan view of the pouch 1. Occasionally, it may be provided in a part of the accommodation space 2 beyond the overhanging seal portions 255, 256, 257. In this case, as shown in FIGS. 10 and 11, the end portion of the heat generating ink layer on the accommodation space 2 side has a shape that follows the end portion of the overhanging seal portion 255, 256, 257 on the accommodation space 2 side. It may have a different shape as shown in FIG. Similar to the first embodiment, the heat generating ink layer formed in the accommodation space 2 is preferably formed in a region of 5 mm or less from the inner edge 22 of the overhanging seal portions 255, 256, 257.

<Fourth Embodiment>
FIG. 13 is an enlarged view of the first side sealed portion in the vicinity of the unsealed portion in the pouch according to the fourth embodiment. In FIG. 13, the same reference numerals are given to the configurations common to those in FIG.

The fourth embodiment is the same as the first embodiment except for the shapes of the overhanging sealed portion and the unsealed portion. The overhanging seal portion in the fourth embodiment has an arc shape protruding toward the accommodation space side and has no angular region.
The overhanging seal portion 355 of FIG. 13 is semi-elliptical when viewed in a plan view, and its long axis substantially coincides with the vertical direction d2 (that is, the first direction). In FIG. 13, the overhanging seal portion 355 is symmetrical in the vertical direction d2.

FIG. 13 is an example, and as long as the overhanging seal portion has an arc shape, the shape and size of the overhanging seal portion are not particularly limited. For example, the overhanging seal portion may be a semicircle, may be a combination of a semi-ellipse and a rectangle, or may be asymmetric in the vertical direction d2. In addition, the size of the overhanging seal portion takes into consideration the volume of the accommodation space 2, that it does not become an obstacle when filling the contents, and the size of the communication area with the unsealed portion when it is ventilated. Set as appropriate.

In FIG. 13, the width of the overhanging seal portion (the length in the direction from the accommodation space 2 toward the unsealed portion 360) is shown so as to be thick in the vicinity of the first side seal portion 51 and thin in the vicinity of the center line 310. ing. However, the present invention is not limited to FIG. 12, and all the overhanging 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 have the same shape as the overhanging sealed portion or may have a different shape. For example, as shown in FIG. 13, the unsealed portion 360 has an edge portion 362 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 portion sealing portion 51. It may have a shape.

In the fourth embodiment, the region where the heat generating ink layer is formed is the same as that in the first embodiment. That is, (1) at least a part of the overhanging seal portion 355 and (2) inner edges 21 and 23 on the accommodation space 2 side of the upper seal portion 56 and the lower seal portion 57 within the region of the unsealed portion 360. (3) It is continuously provided between at least a part of the region located closer to the opening 61. FIG. 13 is an example for explaining the invention, and if the heat-generating ink layer is formed so as to satisfy the above conditions (1) to (3) and the above-mentioned effects are exhibited, the shape of the heat-generating ink layer (Applying pattern) and the like are not particularly limited.

In FIG. 13, the area where the heat generating ink layer is provided is shown by diagonal lines.
In FIG. 13, (1) the overhanging seal portion 355 is provided in a region including the center in the vertical direction d2 (first direction) (the center line X of the overhanging seal portion 355 is shown in FIG. 13). That is, in FIG. 13, the heat generating ink layer is not provided on the overhanging seal portion adjacent to the upper sealing portion 57 and the overhanging sealing portion adjacent to the lower sealing portion 56.
Further, (2) the heat-generating ink layer provided in the unsealed portion 360 extends in the lateral direction d1 with the same width as the length in the direction corresponding to the vertical direction d2 of the heat-generating ink layer of the overhanging seal portion 355, and reaches the opening 61. doing. The heat-generating ink layer of the unsealed portion 360 does not reach the edge portion 362 of the unsealed portion 360.

As shown in FIG. 13, by being provided in a region including the center in the first direction, which is a part of the overhang seal portion 355, a heat generating ink layer of the overhang seal portion 355 was formed when heated in a microwave oven. Peeling of the sheet 11 occurs in the region, and steam can be released to the outside of the pouch.
In the configuration of FIG. 13, the portion where the sheet is peeled off can be restricted, and the sealed state can be maintained at the overhanging seal portion where the heat generating ink layer is not provided. Therefore, when the contents become a liquid by heating and boil, not only the contents that spring up from the lower side but also the contents that reach the upper part of the accommodation space 2 are prevented from being ejected to the outside of the pouch 1. Can be done. Further, since the communication portion with the outside of the pouch 1 is small, it is possible to prevent the contents from leaking from the peeled portion when, for example, the pouch is taken out from the inside of the refrigerator after cooking. Further, even after the sheet is peeled off by heating, the shape of the overhanging seal portion is maintained and the appearance can be maintained.

When the overhanging seal portion has a shape having no corner region as in the fourth embodiment, there is an advantageous effect that the bag can be prevented from being broken from the overhanging seal portion due to the impact when the pouch is dropped. Can be played.

If the heat-generating ink layer provided in the unsealed portion 360 is provided in a region located on the opening 61 side of the inner edges 21 and 23, it may not be provided so as to reach the opening 61 as shown in FIG. good.

Further, the width of the heat-generating ink layer of the unsealed portion 360 and the length (width in the vertical direction) of the heat-generating ink layer of the overhanging seal portion 355 do not necessarily have to be the same. For example, the heat generating ink layer may be provided on the entire surface of the unsealed portion 360.

Although FIG. 13 shows an example in which the heat generating ink layer is provided on a part of the overhanging seal portion 355, in the present embodiment, it may be provided on the entire surface of the overhanging seal portion 355.

As described in the first embodiment, the heat-generating ink layer may be provided so as to reach the inner edge 22 on the accommodation space 2 side in the overhanging seal portion 355. With such a configuration, the bonding force of the sheets 11 in the vicinity of the inner edge 22 of the overhanging seal portion 355 can be surely reduced, and the space between the sheets 11 is increased by increasing the internal pressure in the accommodation space 2 by heating in the microwave oven. It can be peeled off.

Further, in order to sufficiently heat the sheet 11 of the overhanging seal portion 355 and tolerate production tolerances, as shown in FIG. 13, the heat generating ink layer is provided with an overhanging seal when the pouch 1 is viewed in a plan view. It may be provided in a part of the accommodation space 2 beyond the portion 355. In this case, the end portion of the heat generating ink layer on the accommodation space 2 side may have a shape that follows the inner edge 22 of the overhanging seal portion 355, or may have a different shape. Similar to the first embodiment, the heat generating ink layer formed in the accommodation space 2 is preferably formed in a region of 5 mm or less from the inner edge 22 of the overhanging seal portion 355.

<Fifth Embodiment>
FIG. 14 is an enlarged view of the first side sealed portion in the vicinity of the unsealed portion in the pouch according to the fifth embodiment. In FIG. 14, the same reference numerals are given to the configurations common to those in FIG.

The fifth embodiment is the same as the first embodiment except for the shapes of the overhanging sealed portion and the unsealed portion.
The overhanging seal portion 455 of FIG. 14 has a rectangular shape when viewed in a plan view, and has an upper overhanging area 455a, a lower overhanging area 455b, and a middle overhanging area 455c. Further, the overhanging seal portion 455 has a protrusion 456a protruding from the upper overhanging area 455a into the accommodation space 2 and a protrusion 456b protruding from the lower overhanging area 455b into the accommodating space 2. In FIG. 14, the protrusions 456a and 456b are triangular when viewed in a plan view, and the corners are fan-shaped. The two protrusions 456a and 456b are symmetrical in the vertical direction d2.

Note that FIG. 14 is an example, and the shapes of the overhanging seal portion and the protrusion are not particularly limited. For example, the overhanging seal portion may be a trapezoid such as an equiangular trapezoid when viewed in a plan view. Further, the shape of the protrusion may be a rectangle, an arc, an elliptical arc, or the like. The size of the overhanging seal portion and the protrusions takes into consideration the volume of the accommodation space 2, that it does not become an obstacle when filling the contents, and the size of the communication area with the unsealed portion when aerated. And set as appropriate.

FIG. 14 illustrates a case where the unsealed portion 460 has an equiangular trapezoidal shape, but the shape of the unsealed portion is particularly limited in the present embodiment as long as the sealing width of the overhanging sealed portion can be appropriately secured. Not done. For example, the 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 that in the first embodiment. That is, (1) at least a part of the overhanging seal portion 355 and (2) inner edges 21 and 23 on the accommodation space 2 side of the upper seal portion 56 and the lower seal portion 57 within the region of the unsealed portion 360. (3) It is continuously provided between at least a part of the region located closer to the opening 61. FIG. 14 is an example for explaining the invention, and if the heat-generating ink layer is formed so as to satisfy the above conditions (1) to (3) and the above-mentioned effect is exhibited, the shape of the heat-generating ink layer (Applying pattern) and the like are not particularly limited.

In FIG. 14, the area where the heat generating ink layer is provided is shown by diagonal lines.
In FIG. 14, it is continuously provided between (1) a part of the overhanging region 455c and (2) a part of the unsealed portion 460.
(1) The heat-generating ink layer provided in the overhanging region 455c has a center (the center line X of the overhanging seal portion 455 is shown in FIG. 14) in the vertical direction d2 (first direction) of the overhanging seal portion 455. It is provided in the including area. The heat generating ink layer is not provided on the protrusions 456a and 456b.
(2) The heat-generating ink layer provided in the unsealed portion 460 extends in the lateral direction d1 with the same width as the length of the heat-generating ink layer (width in the direction corresponding to the vertical direction d2) in the central overhanging region 455c, and the opening 61 Has reached. Therefore, the heat-generating ink layer of the unsealed portion 460 does not reach the first edge portion 463 and the second edge portion 464 of the unsealed portion 460.

As shown in FIG. 14, by being provided in a region including the center in the first direction, which is a part of the overhang seal portion 455, a heat-generating ink layer in the middle overhang region 455c was formed when heated in a microwave oven. Peeling of the sheet 11 occurs in the region, and steam can be released to the outside of the pouch. Further, since the communication portion with the outside of the pouch 1 is small, it is possible to prevent the contents from leaking from the peeled portion when, for example, the pouch is taken out from the inside of the refrigerator after cooking. Further, 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 the configuration of FIG. 14, the location where the sheet is peeled off can be restricted, and the sealed state can be maintained in the upper overhanging region 455a and the lower overhanging region 455b. Therefore, when the contents become a liquid by heating and boil, not only the contents that spring up from the lower side but also the contents that reach the upper part of the accommodation space 2 are prevented from being ejected to the outside of the pouch 1. Can be done. Further, in the present embodiment, since the protrusions 456a and 456b are provided on the overhanging seal portion 455 so as to sandwich the region where the sheet 11 is peeled off, it is more effective that the contents are ejected from the peeled portion during heating. Can be suppressed.

If the heat-generating ink layer provided in the unsealed portion 460 is provided in a region located on the opening 61 side of the inner edges 21 and 23, it may not be provided so as to reach the opening 61 as shown in FIG. good.

Further, the width of the heat-generating ink layer of the unsealed portion 460 and the length (width in the vertical direction) of the heat-generating ink layer of the overhanging region 455c do not necessarily have to be the same. For example, the heat generating ink layer may be provided on the entire surface of the unsealed portion 460.

Although FIG. 14 shows an example in which the heat generating ink layer is provided on a part of the overhanging seal portion 455, in the present embodiment, it may be provided on the entire surface of the overhanging seal portion 455.

As described in the first embodiment, the heat-generating ink layer may be provided so as to reach the inner edge 22 on the accommodation space 2 side in the overhanging seal portion 455. With such a configuration, the bonding force of the sheets 11 in the vicinity of the inner edge 22 of the overhanging seal portion 455 can be surely reduced, and the space between the sheets 11 is increased by increasing the internal pressure in the accommodation space 2 by heating in the microwave oven. It can be peeled off.

Further, in order to sufficiently heat the sheet 11 of the overhanging seal portion 455 and tolerate production tolerances, as shown in FIG. 14, the heat generating ink layer is provided with an overhanging seal when the pouch 1 is viewed in a plan view. It may be provided in a part of the accommodation space 2 beyond the portion 455. In this case, the end portion of the heat generating ink layer on the accommodation space 2 side may have a shape that follows the inner edge 22 of the overhanging seal portion 455, or may have a different shape. Similar to the first embodiment, the heat generating ink layer formed in the accommodation space 2 is preferably formed in a region of 5 mm or less from the inner edge 22 of the overhanging seal portion 455.

Next, the present invention will be described in more detail by way of examples, but the present invention is not limited to this example.
[Preparation of sample]
<Example 1>
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 heat agent) was gravure-printed on the vapor-deposited surface side of the base material layer and dried to form a heat-generating ink layer having a thickness of 1 μm. The heat-generating ink layer is described in item 2. It was formed by patterning so as to be formed at the location described in the above.
Next, a dry laminating method using a urethane-based two-component curable adhesive (RU-004 / H-1 manufactured by Rock Paint Co., Ltd.) was applied to the surface of the base material layer on the side where the heat-generating ink layer was formed. The base material layer (stretched Ny, thickness 15 μm) was bonded.
Next, a sealant layer (CPP, thickness 70 μm) was laminated on the intermediate base material layer (stretched Ny) by a dry laminating method using the above adhesive to obtain a laminated film.

2. Preparation of pouch A pair of sheets was obtained from the above-mentioned laminated film. Two sheets are overlapped, the side edge and the lower edge are heat-sealed, and the vicinity of the unsealed part is a flat bag type pouch having the shape shown in FIG. 3 (the upper edge is an opening that is not heat-sealed. ) Was obtained. The dimensions of the first side seal portion are described below. The volume of the storage space of the pouch was set to 420 cm ³ .
(1) Length of unsealed portion 1st edge portion 63 (second edge portion 64): 15 mm
Length of third edge 65: 15 mm
Length of opening 61: 15 mm
(2) First side seal portion Width of the upper seal portion 57 (width in the lateral direction d1 from the pouch edge portion 13): 10 mm
Width of lower seal portion 56 (width in lateral d1 from pouch edge 13): 6 mm
(3) Distance from the overhanging seal portion pouch edge 13 to the end of the middle overhanging area 55c on the accommodation space side: 17.5 mm
Width of overhanging region 55a (width of vertical d2 in FIG. 3): 3 mm
Width of underhanging region 55b (width of vertical d2 in FIG. 3): 3 mm
Width of medium overhang area 55c (width of lateral d1 in FIG. 3): 2.5 mm

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

In Example 1, a heat-generating ink layer was formed at a location shown in FIG. Specifically, a heat-generating ink layer was formed in the regions described in (4) to (5) below.
(4) Overhanging seal portion 55: entire surface (5) Unsealed portion 60: entire surface

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

<Example 2>
A pouch (flat bag type pouch) of Example 2 was obtained in the same process as in Example 1 except that a heat-generating ink layer was formed at the location shown in FIG. Specifically, the following heat-generating ink layer was formed.
(6) A rectangular region with the center line X as the axis of symmetry, the length of d2 in the vertical direction: 7 mm, the length of d1 in the horizontal direction: 17.5 mm.
(7) The end on the side edge 13 side coincides with the opening 61, and the protrusion width from the center overhanging area 55c to the accommodation space 2 side: 0 mm.

<Example 3>
Using the same laminated film as in Example 1, a flat bag type pouch having a shape shown in FIG. 10 in the vicinity of the unsealed portion was obtained. The dimensions of the first side seal are described in (8) to (10) below. The volume of the storage space of the pouch was 420 cm ^3, and water (160 g) was contained and sealed as the contents.
(8) Unsealed part Shape: Right-angled isosceles triangle First edge 263 length: 15 mm
Length of opening 61: 15 mm
(9) First side seal portion Width of upper seal portion 57 (width from pouch edge 13 to d1 in the lateral direction): 6 mm
Width of lower seal portion 56 (width in lateral d1 from pouch edge 13): 6 mm
(10) Distance from the overhanging seal portion pouch edge 13 to the end of the corner region 255c on the accommodating space side: 21 mm
Width of overhanging area 255a (width of vertical d2): 3 mm
Width of underhanging area 255b: 5 mm

In Example 3, a heat-generating ink layer was formed at the location shown in FIG. Specifically, the following heat-generating ink layer was formed.
(11) Trapezoidal region centered on the center line X (two internal angles are approximately right angles), length in the vertical direction d2: 10 mm
(12) The end on the side edge 13 side coincides with the opening 61, and the protrusion width from the center overhanging area 55c to the accommodation space 2 side: 2 mm.

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

In Example 4, a heat-generating ink layer was formed at the location shown in FIG. Specifically, the following heat-generating ink layer was formed.
(16) Region with center line X as the axis of symmetry, length d2 in the vertical direction: 12 mm, length on center line X: 18 mm
(17) The end on the side edge 13 side coincides with the opening 61, the end on the accommodation space 2 side is a solitary shape, and the protrusion width from the overhanging seal portion 355 to the accommodation space 2 side: 2 mm.

<Comparative example 1>
A pouch (flat bag type pouch) of Comparative Example 1 was obtained in the same process as in 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 in the microwave oven of a flat table type microwave oven. Then, it was heated at 600 W for 180 seconds. Then, the pouch was taken out from the microwave oven, and the state of the seal portion was visually observed. Twenty pouches were tested in each example and comparative example and evaluated according to the following criteria. The results are shown in Table 1.
A: In all pouches, peeling was confirmed in the overhanging seal part where the heat-generating ink layer was formed, and there was no peeling or seal retreat in the sealing part other than the area where the heat-generating ink layer was formed.
B: In the seal portion other than the region where the heat-generating ink layer is formed, even one pouch in which the seal retracts can be confirmed.
C: In the seal portion other than the region where the heat-generating ink layer is formed, even one pouch in which the seal recedes and the contents during heating are leaked can be confirmed.

<Evaluation of spills>
While the pouches of Examples and Comparative Examples were heated under the above conditions, the state of spillage through the overhanging sealed portion and the unsealed portion was visually observed. Twenty pouches were tested in each example and comparative example and evaluated according to the following criteria. The results are shown in Table 1.
A: All pouches did not show any spills.
B: There were 1 to 4 pouches that could be confirmed to have boiled over.
C: There were 5 or more pouches that could be confirmed to have boiled over.

In each of the examples, no seal retreat of the seal portion was confirmed except in the region where the heat generating ink layer was formed. In addition, in the pouch of the example, it was confirmed that steam was gradually released from the overhanging seal portion from a relatively early stage during heating in the microwave oven. In Example 1, peeling of the sheet could be confirmed in the entire overhanging seal portion, and the appearance was inferior to that of the other examples.
Since the seals of Examples 2 to 4 were opened in the central region of the overhanging seal portion, no ejection (spillage) of the contents was confirmed. In Example 1, since the entire overhanging seal portion was opened, spillage occurred in a part of the pouches.

In Comparative Example 1, it was confirmed that steam was released through the overhanging sealed portion and the unsealed portion. However, a pouch in which the seal retracted was confirmed. Further, since the pouch of Comparative Example 1 was opened near the lower corner region of the overhanging seal portion, the contents may be ejected to the outside of the pouch through the opened portion.

In Comparative Example 2, steam was not released through the overhanging seal portion, and peeling occurred in other seal regions.

1 Pouch 2 Storage space 11 Sheet 30 Laminated film 31 Base material layer 34 Sealant layer 36 Heat-generating ink layer 50 Sealing part 51 First side sealing part 52 Second side sealing part 55 Overhanging sealing part 55a Overhanging area 55b Below Overhang area 55c Medium overhang area 55d Upper angle area 55e Lower angle area 56 Upper seal part 57 Lower seal part 60 Unsealed part 61 Opening

Claims (4)

A pouch having a storage space for accommodating the contents, which is made by stacking at least one laminated film having a sealant layer and heat-sealing the film so that the sealant layer is on the inner layer side.
The side seal portion where the laminated film is heat-sealed and the side seal portion
An unsealed portion that is isolated from the accommodation space by the side sealing portion and the laminated films that are laminated are not heat-sealed.
Have,
The unsealed portion has an opening at the side edge of the laminated film.
The side seal portion includes the upper seal portion and the lower seal portion located on both sides of the unsealed portion, and the upper seal portion and the lower seal portion so as to surround at least a part of the unsealed portion. It has an upper seal portion and an overhanging seal portion that is connected to the portion and projects toward the accommodation space side from the lower seal portion.
At least one of the laminated films has a heat-generating ink layer on the outer layer of the sealant layer.
The heat generating ink layer is
With at least a part of the overhanging seal portion
Within the region of the unsealed portion, at least a part of the region located on the opening side of the upper sealed portion and the inner edge of the lower sealed portion on the accommodation space side.
A pouch that is continuously provided between. The pouch according to claim 1, wherein the heat-generating ink layer reaches the inner edge of the overhanging seal portion on the accommodation space side. The pouch according to claim 1 or 2, wherein the heat-generating ink layer is provided in a part of the accommodation space beyond the inner edge of the overhanging seal portion on the accommodation space side. When the direction in which the upper seal portion, the unsealed portion, and the lower seal portion are arranged is set as the first direction, the heat generating ink layer is a part of the overhanging seal portion, and the first direction. The pouch according to any one of claims 1 to 3, which is provided in a region including a center in one direction.

Images