JP6753159B2 - Microwave oven heating packaging bag - Google Patents

Description

The present invention is used for sealing and packaging liquids, viscous bodies, or contents in which solids are mixed, and does not burst when heated in a microwave oven, and vapor is quickly discharged to the outside of the packaging bag. The present invention relates to a packaging bag for heating in a microwave oven, which automatically lowers the internal pressure and allows safe cooking without spilling the contents.

Traditionally, cooked or semi-cooked foods such as meat buns, buns, shumai, dumplings, hamburgers, hot docks, spaghetti, fried noodles, yaki udon, beef buns and other cooked noodles are stored in a plastic packaging bag. There are packaged foods on the market that are cooked in a microwave oven when eating. In addition, cooked or semi-cooked liquids, sticky substances or mixed contents of liquids and solids, for example, cooked foods such as curry, stew, soup, etc. are stored in a plastic packaging bag and microwaved when eating. There are many packaged foods on the market that are cooked according to the above. Recently, when the packaging bag for storing such food is heated together with the packaging bag in a microwave oven, the internal pressure inside the packaging bag rises due to the thermal expansion of steam generated from the food and the internal air, and the packaging bag bursts. Many packaging bags are used in which a steam venting means is formed in the packaging bag to provide convenience to the user.

Since such a packaging bag has a steam venting means, it is convenient for the user because there is no need to make a steam vent hole in the bag or cut off a part of the corner of the packaging bag when heating in a microwave oven. For example, a steaming portion is formed above the side seal portion, and the steaming portion has a recessed portion that is recessed inward in the width direction of the bag body portion. Standing pouches are known (see, for example, Patent Document 1). However, since this steaming part has a dented part, when handling the standing pouch in the process from filling to distribution, the dented part is caught in the dented part of another product, which is inconvenient to handle. There is a risk of inducing the cause of the bag torn, such as getting caught in the packaging bag and damaging it.

Further, a steaming portion having a steaming seal portion and an unsealed portion is formed above the side seal portion of the bag body portion, and the steaming seal portion is recessed from the outside to the inside in the width direction of the bag body portion. A steam venting standing pouch having a shape, in which the unsealed portion is formed continuously with the steaming sealed portion in the recessed portion of the steaming sealed portion and has a notch in the sheet constituting the unsealed portion, is disclosed. (See, for example, Patent Document 2). However, since the unsealed portion has a notch, there is a problem that the juice of the contents spills from the notch of the unsealed portion when it is taken out from the inside of the microwave oven after heating in the microwave oven. There is also a problem that the number of steps for forming a notch increases.

WO2013 / 133092 Japanese Unexamined Patent Publication No. 2013-256323

Therefore, the present invention has been made to solve the above problems, and the purpose of the present invention is to quickly discharge the steam in the packaging bag generated by heating in a microwave oven to the outside of the packaging bag, and automatically reduce the internal pressure. It is an object of the present invention to provide a packaging bag for heating a microwave oven, which can be safely cooked without spilling the juice of the contents even when it is taken out from the inside of the microwave oven.

In order to achieve the above object, the present invention according to claim 1 is a bag for heating by a microwave oven, and has at least an upper end joint and a lower end arranged so as to face each other vertically on the peripheral edge. In a microwave oven heating packaging bag provided with a joint and side end joints arranged facing each other on the left and right, only one of the side end joints arranged facing left and right The steam venting means forming portion is provided, the steam venting means forming portion is provided with a steam port forming joint portion and a liquid leakage prevention region, and the steam port forming joint portion is partially outward of the side end joint portion. It has a chevron shape that is recessed inward from the top and has a tip at the top of the recess, and the liquid leakage prevention region is composed of an unjoined portion that is continuous with the outer edge of the joint portion for forming a steam port , and the liquid leakage. When a notch is not provided in the prevention region and a virtual tangent line is drawn between the outer edges of the side end joint where the outer edge of the unjoined portion connects the bases on both sides of the steam port forming joint, the said It is a packaging bag for heating a microwave oven , which is recessed inward from the virtual tangent line and satisfies the following relational expressions (1) and (2) .
α <β ... (1)
α ＋ β ≦ γ ・ ・ ・ ・ ・ ・ ・ ・ (2)
α: The length of the perpendicular line drawn from the lowest point inward at the outer edge of the unjoined part to the virtual tangent.
β: Length between the lowest point toward the inside and the outer edge of the tip at the outer edge of the unjoined portion
γ: Length between the bases on both sides of the steam port forming joint

Further, according to the second aspect of the present invention, in the microwave oven heating packaging bag according to the first aspect, the microwave oven heating packaging bag has an inverted V in the vertical direction at the lower end facing the upper end joint portion. It is a self-standing bag with a shaped bottom .

In the packaging bag for heating a microwave oven of the present invention, the steam in the packaging bag generated by heating in the microwave oven is quickly discharged to the outside of the packaging bag, and the internal pressure is automatically lowered without bursting. Even when taken out of the oven, the juice of the contents does not spill and can be safely cooked.

It is a front view which shows one Embodiment of the packaging bag for microwave oven heating which concerns on this invention. FIG. 1 is a cross-sectional view taken along the line AA of FIG. It is explanatory drawing of the main part of one Embodiment of the packaging bag for microwave oven heating which concerns on this invention, (a) is the enlarged view in circle of FIG. 1, (b) is the sectional view taken along line BB. It is explanatory drawing which shows the structural example of the laminated body of the packaging bag for microwave oven heating which concerns on this invention.

The above invention will be described in detail below with reference to drawings and the like.
FIG. 1 is a front view showing an embodiment of a microwave oven heating packaging bag according to the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a microwave oven heating packaging bag according to the present invention. An explanatory view of a main part of the embodiment, (a) is an enlarged view in a circle of FIG. 1, (b) is a sectional view taken along line BB, and FIG. 4 is a laminated body of a packaging bag for heating a microwave oven according to the present invention. In the figure, 1 is a packaging bag for heating a microwave oven, 2 is an upper end joint, 3 is a lower end joint, 4 and 5 are side end joints, and 5a and 5b are side end joints. Outer edge of the part, 6 is the steam venting means forming part, 61 is the joint part for forming the steam port, 61a and 61b are the base part, 61c is the outer edge of the joint part for forming the steam port, 61d is the tip, 62 is the unjoined part, and 62a is the unjoined part. Outer edge, 63 is virtual tangent, 7 is notch, 8 is body, 8a, 8b is body, 9 is bottom, 9a is bottom, 10 is laminate, 11 is base layer, 12 is intermediate layer, 13 Is a heat-sealing resin layer, 14 and 15 are adhesive layers, and R is a liquid leakage prevention region.

FIG. 1 is a front view showing an embodiment of a packaging bag for heating a microwave oven according to the present invention, and FIG. 2 is a cross-sectional view taken along the line AA of FIG.
The packaging bag 1 for heating a microwave oven according to the present invention is a bag for heating by a microwave oven, and is composed of two substantially quadrangular laminated bodies 10 as shown in FIGS. 1 and 2. The body materials 8a and 8b are overlapped with each other facing each other, the peripheral edges are heat-bonded, and at least the upper end joint 2 and the lower end joint 3 arranged vertically facing each other on the peripheral edge and the sides arranged facing each other on the left and right It is configured to include end joints 4 and 5. Further, a bottom member 9a made of a laminated body 10 is folded inward and inserted into the lower end facing the upper end joint 2, and is heat-bonded at the boat-shaped lower end joint 3, and the bottom 9 has an inverted V shape in the vertical direction. It is a self-supporting bag provided with a body portion 8 composed of body members 8a and 8b arranged to face each other. The upper end joint 2 is an unbonded opening until the contents are filled. After filling the contents into the microwave oven heating packaging bag 1 through this opening, the upper end joint 2 is heat-bonded. Part 2 is formed and sealed and packaged.

A notch 7 for opening the microwave oven heating packaging bag 1 is formed on the upper portion of the side end joint portion 4. The side end joint portion 5 is provided with a vapor venting means forming portion 6, and the vapor venting means forming portion 6 is provided with a vapor port forming joint portion 61 and a liquid leakage prevention region R. The steam port forming joint 61 has a shape in which a part of the side end joint 5 is recessed from the outside to the inside. The liquid leakage prevention region R is composed of an unjoined portion 62 continuous with the outer edge of the vapor port forming joint portion 61, and the unjoined portion 62 has no notch.

FIG. 3 is an explanatory view of a main part of an embodiment of a packaging bag for heating a microwave oven according to the present invention, (a) is an enlarged view in a circle of FIG. 1, and (b) is B shown in (a). It is sectional drawing in-B line. The main part of the microwave oven heating packaging bag 1 according to the present invention will be described in detail with reference to FIG. The vapor venting means forming portion 6 includes a vapor port forming joint portion 61 and a liquid leakage prevention region R. The steam port forming joint 61 has a chevron shape in which a part of the side end joint 5 is recessed from the outside to the inside, and a tip 61d is provided at the top of the chevron shape. When the tip 61d is provided and heated in a microwave oven, the tip 61d of the joint portion 61 for forming a steam port first starts peeling due to the heat of steam generated by the heating and the internal pressure, and the joint part peels back and peels back. When it reaches the unjoined portion 62, steam is quickly discharged from the unjoined portion 62 to the outside of the microwave oven heating packaging bag 1. Further, the tip 61d is a packaging bag 1 for heating a microwave oven, as compared with any inner end of the upper end joint portion 2, the lower end joint portion 3, and the side end joint portions 4 and 5 forming the packaging bag 1 for heating the microwave oven. It is preferable to arrange them so as to be closest to the center, and the base portion 61a and the base portion 61b are provided at the chevron-shaped base of the steam port forming joint portion 61, and the base portion 61a and the base portion 61b are connected to the side end joint portion 5. doing.

The liquid leakage prevention region R is composed of an unjoined portion 62 continuous with the outer edge 61c of the joint portion for forming a vapor port, and the unjoined portion 62 is formed by separating the body material 8a and the body material 8b constituting the body into two pieces. Communicate with the outside air. Further, neither the body member 8a nor the body member 8b constituting the unjoined portion 62 has a notch. As shown in FIG. 3A, the outer edge 62a of the unjoined portion is curved from the outside to the inside, and the side of the side end joint portion 5 to which the base portions 61a and 61b on both sides of the joint portion 61 for forming a steam port are connected. When a virtual tangent 63 is drawn between the outer edges 5a and 5b of the end joint, the length of the perpendicular line drawn from the lowest point toward the inside at the outer edge 62a of the unjoined portion to the virtual tangent 63 is α, which is larger than the virtual tangent 63. The length α recedes inward. Further, it is preferable that the relationship of α <β is satisfied, where β is the length between the lowest point toward the inside and the outer edge of the tip 61d at the outer edge 62a of the unjoined portion. The outer edge of the unjoined portion 62 can be made straight without being curved, but the length from the outer edge of the tip 61d to the outer edge 62a of the unjoined portion becomes α + β, and the steam generated during heating in the microwave oven is exhausted due to the lengthening. Since it becomes difficult, it is preferable that the outer edge 62a of the unjoined portion is retracted inward from the virtual tangent line 63. In particular, when the distance between the base 61a and the base 61b is γ, it is preferably α + β ≦ γ, and when considering the size of a general packaging bag, 1 mm ≦ α ≦ 10 mm, more preferably 3 mm. ≦ α ≦ 7 mm, 7 mm ≦ β ≦ 20 mm, more preferably 10 mm ≦ β ≦ 15 mm, 10 mm ≦ γ ≦ 30 mm, and more preferably 15 mm ≦ γ ≦ 20 mm.

In the present invention, the vapor venting means forming portion 6 includes a vapor port forming joint 61 and a liquid leakage prevention region R, and the vapor port forming joint 61 has a part of the side end joint 5 from the outside to the inside. The shape is recessed in the direction, and the liquid leakage prevention region R is composed of an unjoined portion 62 continuous with the outer edge 61c of the joint portion for forming a vapor port, and the unjoined portion 62 is not cut. The configuration of the steam venting means forming unit 6 is not limited as long as it does not deviate from the purpose. Further, the packaging bag can be applied to a bag form other than the self-standing bag shown in the first embodiment, and the microwave heating packaging bag 1 is flat such as a three-way seal type bag, a four-way seal type bag, and a pillow type bag. It may be a bag. Since the packaging bag 1 for heating a microwave oven of the present invention has no notch in the unjoined portion 62, it has an effect of preventing spillage of juice or the like of the contents when the bag is taken out from the microwave oven after heating in the microwave oven.

Further, although not shown, the packaging bag 1 for heating a microwave oven according to an embodiment of the present invention is filled with the contents from a portion to be formed of an upper end joint portion which is not adhered and has an opening, and then the upper end joint portion 2 is used. When the heat-bonded and sealed package is heated in a microwave oven, the heat and internal pressure of the steam generated by the heating causes the joint to peel back from the tip 61d of the joint 61 for forming a steam port, and the peel back occurs in the unjoined 62. When it reaches, steam is quickly discharged from the unjoined portion 62 to the outside of the microwave oven heating packaging bag 1, and is automatically opened from the steam venting means forming portion 6. Since the outer edge 62a of the unjoined portion is retracted inward from the virtual tangent line 63, steam is smoothly discharged without blocking the unjoined portion 62, so that the internal pressure can be automatically lowered and the microwave oven is heated. The packaging bag 1 does not burst. Further, since there is no notch in the unjoined portion 62 even when it is taken out from the microwave oven, the body material 8a and the body material 8b of the unjoined portion 62 are in close contact with each other, and the juice of the contents does not spill due to the closing effect, and it is safe. Can be cooked.

Next, a configuration example of the laminated body 10 forming the microwave oven heating packaging bag 1 of the present invention will be described with reference to FIG. As shown in FIG. 4, the laminate 10 is configured to include a base material layer 11, a printing layer, an adhesive layer 14, an intermediate layer 12, an adhesive layer 15, and a thermosetting resin layer 13 in this order. The intermediate layer 12 is appropriately provided in consideration of the sterilization conditions of the contents and the package, the transportation conditions of the package, and the like, and is a layer that can be omitted depending on the conditions. The print layer is not shown.

The base material layer 11 is not particularly limited as long as it has heat resistance and is usually a material that can withstand heating by a microwave oven. For example, any of stretched polyethylene terephthalate film, silica vapor-deposited stretched polyethylene terephthalate film, alumina vapor-deposited stretched polyethylene terephthalate film, stretched nylon film, silica-deposited stretched nylon film, alumina-deposited stretched nylon film, stretched polypropylene film, polyvinyl alcohol-coated stretched polypropylene film, etc. Alternatively, a composite film in which two or more of these are laminated can be used. The thickness of the base material layer 11 is about 10 μm to 50 μm, preferably about 10 μm to 30 μm.

As the intermediate layer 12, the film shown in the base material layer 11, an ethylene-vinyl alcohol copolymer film, or the like is used.

Further, the resin constituting the thermosetting resin layer 13 can usually be used as long as it can withstand heating by a microwave oven. For example, low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, polypropylene, propylene-ethylene copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid. Resins such as copolymers, ethylene-methyl acrylate copolymers, ethylene-ethyl acrylate copolymers, ethylene-methyl methacrylate copolymers and ionomers can be used.

The thermosetting resin layer 13 may be formed by forming these resins by an extrusion laminating method, or as a film formed in advance by a T-die method, an inflation method, or the like, the base material layer or the intermediate layer and the dry laminating method or It may be laminated by an extrusion laminating method or the like. The thickness of the thermosetting resin layer 13 is preferably about 20 μm to 100 μm.

Further, as the resin of the heat-sealing resin layer, in particular, it has sufficient sealing strength at low temperature (0 ° C.) and normal temperature (25 ° C.), and the sealing strength is low at the time of microwave heating (90 ° C. or higher). As the resin having the property of rapidly peeling off, it is preferable to use a resin composed of a resin composition containing a propylene-ethylene block copolymer resin as a main component.

Next, the base material layer 11 and the heat-sealing resin layer 13 and the base material layer 11 and the intermediate layer 12 and the heat-sealing resin layer 13 are laminated by a normal laminating method such as an extrusion laminating method or a dry laminating method. The laminated adhesive layers 14 and 15 are an adhesive resin layer such as a polyolefin resin used in the extrusion lamination method, and an adhesive layer such as a urethane two-component reaction type adhesive used in the dry lamination method. is there.

The microwave oven heating packaging bag 1 of the present invention can be manufactured into a self-standing bag, a four-way seal type or a three-way seal type packaging bag by making a bag using the laminated body 10. After that, the contents are filled from the upper end joint portion to be formed as the opening and heat-bonded to produce the upper end joint portion 2 and the none package.

The present invention will be further described below with reference to Examples and Comparative Examples.

[Example 1]
A laminate of 12 μm-thick alumina-deposited polyethylene terephthalate film, 15 μm-thick stretched nylon film, and 70 μm-thick non-stretched polypropylene film dry-laminated with a urethane-based two-component reaction adhesive, as shown in FIG. Self-supporting bag type microwave heating packaging bag 1 having a steam port forming joint 61 and a steam venting means forming portion 6 provided with a liquid leakage prevention region R (external dimensions, vertical height: 147 mm, horizontal width: 160 mm, bottom gusset width: 41 mm) was produced.
The length of the steam venting means forming portion 6 is as follows.
Length in the width direction (seal width + α + β): 15 mm
Length in the height direction (γ): 15 mm
Seal width: 3 mm
Retreat length of unjoined part (α): 5 mm

210 g of commercially available curry was placed in the microwave oven heating packaging bag 1 obtained above, and the upper end joint 2 was heat-sealed and sealed to prepare a package, which was then retorted at 120 ° C. for 30 minutes. As a result of heating the product in a microwave oven with an output of 500 W, after about 1 minute and 20 seconds, steam passes through the unjoined portion 62 from the peeled-back portion of the joint portion 61 for forming a steam port, and is quickly discharged to the outside for cooking. I was able to. In addition, when taking out from the microwave oven, the juice of the contents did not spill from the unjoined portion and could be taken out safely.

1 Microwave heating packaging bag 2 Upper end joint 3 Lower end joint 4, 5 Side end joint 5a, 5b Side end joint outer edge 6 Steam venting means forming part 61 Steam port forming joint 61a, 61b Base 61c Steam port Outer edge of joint for formation 61d Protrusion 62 Unjoined 62a Outer edge of unjoined 63 Virtual tangent 7 Notch 8 Body 8a, 8b Body 9 Bottom 9a Bottom 10 Laminated 11 Base material layer 12 Intermediate layer 13 Heat-sealing resin Layers 14, 15 Adhesive layer R Liquid leakage prevention area

Claims (2)

A bag for heating in a microwave oven
In a microwave oven heating packaging bag including at least an upper end joint arranged vertically facing each other on the peripheral edge, a lower end joint, and side end joints arranged facing each other on the left and right sides.
Only one of the side end joints arranged to face each other on the left and right is provided with a steam venting means forming portion.
The vapor venting means forming portion includes a vapor port forming joint portion and a liquid leakage prevention region.
The steam port forming joint has a chevron shape in which a part of the side end joint is recessed from the outside to the inside and a tip is provided at the recessed top .
The liquid leakage prevention region is composed of an unjoined portion continuous with the outer edge of the vapor port forming joint portion , and the liquid leakage prevention region is not provided with a notch.
When a virtual tangent is drawn between the outer edges of the unjoined portion and the outer edges of the side end joint where the bases on both sides of the steam port forming joint are connected, the outer edge is recessed inward from the virtual tangent and , A packaging bag for heating a microwave oven, which satisfies the following relational expressions (1) and (2) .
α <β ... (1)
α ＋ β ≦ γ ・ ・ ・ ・ ・ ・ ・ ・ (2)
α: The length of the perpendicular line drawn from the lowest point inward at the outer edge of the unjoined part to the virtual tangent.
β: Length between the lowest point toward the inside and the outer edge of the tip at the outer edge of the unjoined portion
γ: Length between the bases on both sides of the steam port forming joint The microwave oven heating according to claim 1, wherein the microwave oven heating packaging bag is a self-standing bag having an inverted V-shaped bottom portion in the vertical direction at the lower end facing the upper end joint portion. For packaging bag.

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