JP2019196199A - Packaging bag - Google Patents

Abstract

To provide a packaging bag that has a vapor conducting function of automatically letting out generated water vapor when heating the bag without change with a microwave oven, in which a pin hole is hardly produced by excessively heating.SOLUTION: A packaging bag is formed by making sealant layers of a surface laminate 2 and a rear laminate 3, which have base material layers 15, microwave heat-generating ink layers 17 that generate heat by partially provided microwaves and sealant layers 18 respectively, oppose to each other and thermally sealing peripheral edges of the layers to form a storage part 8. The surface laminate forming the storage part is provided with a vapor conducting mechanism 11 that automatically releases water vapor when inner pressure of the packaging bag is increased by water vapor generated by heating. The vapor conducting mechanism forms a seal part 12 in a protrusion shape expanding from a side seal part, where a vapor extraction hole 13, an entire penetration hole or a half-penetration hole, is provided in the surface laminate in the seal part in a protrusion shape.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a packaging bag that can be heated in a microwave oven in a state in which contents are stored, and that is less likely to generate pinholes due to overheating.

  2. Description of the Related Art Conventionally, retort foods that have been stored in soft packaging bags and then subjected to retort sterilization treatment and can be stored for a long time have been widely used. Soft packaging bags that use aluminum foil in the layer structure cannot be heated in the microwave oven as they are, so either wrap the entire bag or unpack it and transfer the contents to another container before microwave oven It was necessary to heat with.

  However, since packaging bags that can ensure long-term storage stability without using aluminum foil have been put into practical use in recent years, a cooking method in which the packaging bags are heated in a microwave oven is becoming common.

  There has been proposed a package that can be cooked in a microwave oven as it is without storing the contents in a packaging bag made of a soft packaging material using a synthetic resin film or the like and opening the package. The packaging bag having an automatic pressure regulation function described in Patent Document 1 ensures that the pressure in the bag is automatically detected from a specific portion of the bag when the inside of the bag reaches a predetermined internal pressure when heated by a microwave oven or the like. It is a packaging bag having an automatic pressure regulating function that can be easily released and that is advantageous in the manufacturing process.

  The packaging bag described in Patent Document 1 includes a first film and a base film (2a) / sealant layer (2b) / sealant layer (2c) having a layer configuration of base film (1a) / sealant layer (1b). ) Is a bag having a structure heat-sealed in a state where the sealant layers 1b and 2c are arranged to face each other, and the second film includes a base film (2a) / The packaging bag is characterized in that a small opening is formed by punching or cutting in the thickness direction through only the layer structure portion of the sealant layer (2b).

  The packaging bag described in Patent Document 1 performs its function sufficiently under ideal heating conditions, but when overheating occurs due to a heating time setting error or partial heating unevenness. In addition, there was a risk of pinholes due to melting of a part of the packaging bag.

  As a means for preventing this pinhole due to overheating, it has been known for a long time that the packaging bag can be prevented from melting by the heat insulation effect of the air layer by doubling the packaging bag and providing an air layer in the middle. However, double packaging bags cannot be said to be a preferable means because an increase in material cost and manufacturing cost cannot be avoided.

Japanese Patent No. 3942709 JP 2017-159912 A

  The problem to be solved by the present invention is to propose a packaging bag having a steaming function for automatically releasing generated water vapor when heated in a microwave oven as it is, and in which a pinhole due to overheating is unlikely to occur. Is.

  As a means for solving the above problems, the invention according to claim 1 is such that the sealant layers of the front surface laminate and the back surface laminate each having a base material layer and a sealant layer are opposed to each other, and the periphery is heat sealed. A packaging bag formed with a storage portion, wherein the surface laminate forming the storage portion has a steam passage for automatically releasing water vapor when the internal pressure of the packaging bag is increased by water vapor generated by heating. The steaming mechanism has a protruding seal portion that protrudes from the side seal portion, and a surface laminated body in the protruding seal portion is provided with a full-through hole or a semi-through-hole steam vent hole. A micro-layer that generates heat by microwaves between the base material layer and the sealant layer in a portion of the front surface laminate and the back surface laminate, excluding a peripheral seal portion, a protruding seal portion, and an opening position of the packaging bag. Is a packaging bag which is characterized in that a heating ink layer.

  When the packaging bag according to the present invention is provided with a microwave heat generating ink layer that generates heat partially by a microwave between the base material layer and the sealant layer, the microwave heat generating ink layer is heated when heated in a microwave oven. Generates heat and evaporates to form voids. For this reason, even if overheating occurs, this void exhibits a heat insulating effect and prevents the occurrence of pinholes due to melting of the laminate.

  The invention according to claim 2 is characterized in that the base material layer constituting the front surface laminate and the back surface laminate includes a gas barrier layer that suppresses permeation of water vapor and oxygen. It is a bag.

  Since the packaging bag which concerns on this invention equips the storage part with the vapor transmission mechanism for releasing the water vapor | steam which generate | occur | produces when it heats with a microwave oven, it can be cooked with a microwave oven with a packaging bag.

  By providing a microwave heating ink layer that generates heat by microwaves between the base material layer and the sealant layer excluding the seal portion and opening position, this microwave heating ink layer generates heat when heated in a microwave oven. Evaporates with it to form voids. For this reason, even if overheating occurs, this void exhibits a heat insulating effect and prevents the occurrence of pinholes due to melting of the laminate.

  When the base material layer constituting the front surface laminate and the back surface laminate includes a gas barrier layer that suppresses permeation of water vapor and oxygen as in the invention described in claim 2, the packaging body can be stored for a long time. , Can be deployed in various applications.

FIG. 1 is an explanatory plan view schematically showing one embodiment of a packaging bag according to the present invention. FIG. 2 is a cross-sectional explanatory view schematically showing the AA ′ cross section of FIG. 1. FIG. 3 is a cross-sectional explanatory view schematically showing a layer configuration in an example of a front surface laminate and a back surface laminate constituting the packaging bag according to the present invention. FIG. 4 is a cross-sectional explanatory view schematically showing a layer structure in another example of the front surface laminate and the back surface laminate constituting the packaging bag according to the present invention.

Hereinafter, the packaging bag according to the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory plan view schematically showing one embodiment of a packaging bag 1 according to the present invention. In addition, FIG.
It is sectional explanatory drawing which showed typically the AA 'cross section. Moreover, FIG. 3 is sectional explanatory drawing which showed typically the layer structure in an example of the surface laminated body 2 and the back surface laminated body 3 which comprise the packaging bag based on this invention.

  The packaging bag 1 which concerns on this invention forms the accommodating part 8 by making the base material layer 15, the sealant layers of the surface laminated body 2 and the back surface laminated body 3 which have at least the sealant layer 18 face each other, and heat-sealing the periphery. This is a packaging bag. The surface laminate 2 that forms the storage portion 8 has a steaming mechanism 11 for automatically releasing steam when the internal pressure of the packaging bag is increased by steam generated by heating, A protruding seal portion 12 projecting from the side seal portions 4 and 5 is formed, and a steam vent hole 13 having a full through hole or a half through hole is provided in the surface laminate 2 in the protruding seal portion 12. .

  Heat is generated by microwaves between the base material layer 15 and the sealant layer 18 in portions of the front surface laminate 2 and the back surface laminate 3 except for the peripheral seal portions 4 to 7 and the protruding seal portions 12 and the opening position of the packaging bag. A microwave heating ink layer 17 is provided.

  When the packaging bag 1 is heated in a microwave oven, the microwave heat generating ink layer 17 absorbs microwaves and generates heat, and decomposes or evaporates to generate gas, thereby generating a gap between the layers of the laminate. Since this void has a heat insulating effect, when it is excessively heated in a microwave oven, it exerts an effect of suppressing the occurrence of pinholes by melting the laminate.

  Such a microwave heat-generating ink layer 17 is obtained by applying an ink composition containing a conductive organic compound and a resin as described in Patent Document 2. Examples of conductive organic compounds include polyanilines, polypyrroles, polythiophenes, polyacetylenes, polyisothianaphthenes, polythienylene vinylenes, polyparaphenylenes, polyparaphenylene vinylenes, polyfluorenes, polycarbazoles, Polyacenes, polythiazyl, polyethylene vinylenes, polyphenylene sulfides, polyperiphthalenes, polyacrylonitriles, polyoxadiazoles, polyindoles, polyazulenes, polyfurans, phthalocyanines and their derivatives, polysilanes, polygermane , Porphyrins and derivatives thereof, graphenes or derivatives thereof, perylene derivatives, tetrathiafulvalene derivatives, sulfur-containing heterocyclic compounds, oxygen-containing heterocyclic compounds, nitrogen-containing heterocyclic compounds , Tetracyanoquinodimethane derivatives, fullerenes, it is possible to use at least one carbon nanotubes are selected from the group consisting of quinones.

  In addition to these conductive organic compounds, halogens, Lewis acids, proton acids, organic carboxylic acids, transition metal halides, electrolyte anions, organic cyano compounds, quinones, alkali metals, alkaline earth metals, amino acids, nucleic acids, interfaces At least one selected from the group consisting of an activator, a dye, an alkylammonium ion, and a quaternary phosphonium salt can also be included as a dopant.

  Since the microwave heat-generating ink layer 17 exists only in the portions of the front surface laminate 2 and the back surface laminate 3 except for the peripheral seal portions 4, 5, 6, 7 and the protruding seal portion 12 and the opening position of the packaging bag. In addition, there is no problem of a decrease in seal strength or a peeling problem at each seal portion. Further, since it does not exist at the opening position, there is no problem that the laminated body is peeled off at the time of opening and is difficult to open.

The surface laminate 2 that forms the storage portion 8 has a vapor transmission mechanism 11 for automatically releasing water vapor when the internal pressure of the packaging bag is increased by water vapor generated by heating. As the steaming mechanism 11 of the packaging bag according to the present invention, as shown in FIG. 1 as an example, a protruding seal portion 12 protruding from the side seal portion is formed, and the surface laminate in the protruding seal portion 12 2 is provided with a steam vent 13 which is a full through hole or a half through hole.

  When the contents stored in the packaging bag are heated in the microwave oven and water vapor is generated, the internal pressure of the storage portion 8 increases, and stress concentrates on the protruding seal portion 12. As a result, the seal of the protruding seal portion 12 is retracted and peeled, and water vapor is released from the vapor vent hole 13.

  In the case of the steaming mechanism as shown in FIG. 1, after forming the steam vent hole 13 in the surface laminate 2 in advance, the peripheral seal portion and the protruding seal portion 12 are formed.

  As the base material layer 15 used for the laminate constituting the packaging bag 1 according to the present invention, various synthetic resin films having excellent heat resistance and tensile strength are used. Specifically, stretched polypropylene resin (OPP), polyethylene terephthalate resin (PET), polybutylene terephthalate resin (PBT), polyester resins such as polyethylene naphthalate resin (PEN), polyamides such as nylon-6 and nylon-66 It is a synthetic resin film such as a base resin and a polycarbonate resin (PC).

  As shown in FIG. 4, the base material layer 15 can include a gas barrier layer 16 that suppresses permeation of water vapor and oxygen. As the gas barrier layer 16, a polyvinylidene chloride film, a polyvinyl alcohol film, an ethylene vinyl alcohol copolymer film, a gas barrier nylon film, a gas barrier film such as a gas barrier polyethylene terephthalate (PET) film, a PET film or the like such as aluminum. Metal-deposited film obtained by depositing metal, inorganic oxide-deposited film obtained by depositing inorganic oxide such as aluminum oxide and silicon oxide on PET film, or coating containing polyvinylidene chloride coating, water-soluble resin and inorganic layered compound Alternatively, a gas barrier coating layer such as a resin layer made of a film obtained by reacting an isocyanate compound with a metal alkoxide or a hydrolyzate thereof can be used. In particular, a gas barrier film in which a vapor deposition layer is provided on a PET film can be used as it is as a base material layer.

  As the sealant layer 18, a polyolefin resin is generally used. Specifically, a low density polyethylene resin (LDPE), a medium density polyethylene resin (MDPE), a linear low density polyethylene resin (LLDPE), ethylene- Ethylene resins such as vinyl acetate copolymer (EVA), ethylene-α olefin copolymer, ethylene-methacrylic acid resin copolymer, blend resin of polyethylene and polybutene, homopolypropylene resin (PP), propylene- Polypropylene resins such as ethylene random copolymer, propylene-ethylene block copolymer, and propylene-α olefin copolymer are used.

  For laminating each layer, a dry laminating method using an adhesive or an extruding laminating method using an extruder can be used. Hereinafter, based on an Example, the packaging bag which concerns on this invention is demonstrated more concretely.

  A nylon film having a thickness of 15 μm was used as a base material layer, and a microwave heating ink layer was partially formed on the back surface using microwave heating ink. As the sealant layer, an unstretched PP resin film (CPP) having a thickness of 60 μm was used. Both were dry laminated to form a laminate. The laminated body to be the surface laminated body was previously provided with a steam vent hole at a predetermined location. Using this laminate, a packaging bag as shown in FIG. 1 was prepared. The dimensions of the packaging bag were a width of 130 mm and a height of 135 mm. This packaging bag was filled with commercially available frozen hamburger and Demigra sauce (170 g in total), hermetically sealed, and then heated in a microwave oven to check for the occurrence of pinholes. The heating conditions were 600W 3 minutes, 4 minutes, and 5 minutes, and the experiment was performed with n = 5.

<Comparative Example 1>
As a comparative example, using the same material as in Example 1, a laminate not including a microwave exothermic ink layer was prepared, a packaging bag was similarly prepared, and evaluated in the same manner. The results are summarized in Table 1.

From the results in Table 1, it was confirmed that the packaging bag of the present invention has a low probability of occurrence of pinholes during overheating.

DESCRIPTION OF SYMBOLS 1 ... Packaging bag 2 ... Front surface laminated body 3 ... Back surface laminated body 4, 5 ... Side seal part 6 ... Bottom seal part 7 ... Top seal part 8 ... Storage part 9 ... Opening notch 11 ... Vapor passage mechanism 12 ... Protruding seal 13 ... Vapor vent 15 ... Base material layer 16 ... Gas barrier layer 17 ... Microwave heat generating ink layer 18 ... Sealant layer

Claims (2)

  A packaging bag in which a sealant layer of a front surface laminate and a back surface laminate each having a base material layer and a sealant layer is opposed to each other, and a peripheral portion is heat-sealed to form a storage portion, the surface forming the storage portion The laminated body has a steaming mechanism for automatically releasing steam when the internal pressure of the packaging bag is increased by steam generated by heating, and the steaming mechanism has a protruding shape protruding from the side seal portion. A seal portion is formed, and a vapor release hole of a full through hole or a half through hole is provided in the surface laminate in the projecting seal portion, and the peripheral seal portion and the protrusion of the surface laminate and the back laminate A packaging bag, characterized in that a microwave heat generating ink layer that generates heat by microwaves is provided between the base material layer and the sealant layer at portions other than the opening portion of the shaped seal portion and the packaging bag.   The packaging bag according to claim 1, wherein the base material layer constituting the front surface laminate and the back surface laminate includes a gas barrier layer that suppresses permeation of water vapor and oxygen.