JP2001353069A - Insulation sheathing bag and packaging body heated in microwave oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insulation sheathing bag and a packaging body heated in a microwave oven whereby problems observed when a packaging bag is heat-cooked in the microwave oven can be cleared and preparation for cooking is easy and the shape of the packaging bag can be stabilized when it is heated in the microwave oven and anxious feeling of consumers is eliminated and which are especially useful by applying them to an outer packaging of a packaging bag provided with a pressure releasing part such as a back sticking part. SOLUTION: The insulation sheathing bag which has the pressure releasing part 7 and is applied to the outer packaging of the packaging bag 1 heated in the microwave oven is provided and the insulation sheathing bag body 6 is constituted of a sheet with flexibility and heat insulation properties and the insulation sheathing bag body 6 is provided with a cutting and opening means for exposing the pressure releasing part 7 of the packaging bag heated in the microwave oven.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer packaging bag for a microwave-heated packaging bag, and more particularly, to a heat-insulating exterior bag applied to an outer packaging of a packaging bag which is filled with food or the like so as to be heated by a microwave oven. And a microwave-heated package.

[0002]

2. Description of the Related Art Recently, packaging bags containing cooked foods which can be heated in a microwave oven are becoming popular. Such microwave oven-heated packaging products are very convenient because they can be heated in a microwave as they are. However, when the food is heated in a microwave oven, a large amount of water vapor is generated and the internal pressure of the packaging bag gradually increases while heating is continued. Therefore, unless the packaging bag is provided with a pressure relief means, the packaging bag will be in an over-inflated state, and in severe cases, there is even a risk of rupture.

Conventionally, as pressure relief means, for example,
Japanese Patent Application Laid-Open No. 99065 discloses a type in which an opening notch is formed at a corner portion of a microwave oven packaging bag, and the corner portion of the packaging bag is cut off and opened based on the notch at the time of use to form a pressure relief port. Proposed. In addition, the present applicant has disclosed in Japanese Patent Application Laid-Open Nos. H10-72070, H10-310181 and H11-130159, for example, that a back-paste portion is provided as a pressure-relief portion on the upper surface of a packaging bag. A configuration was proposed in which a part of the back part was cut off or a part of the back part was weakly bonded, and a part of the back part was peeled off by internal pressure to form a relief port.

[0004] The microwave packaging bag is distributed and sold in a paper outer box for protection and the like.

[0005]

When a food is heated in a microwave oven, a consumer removes a packaging bag for the microwave oven from an outer packaging box, and preparation for cooking is troublesome.

[0006] Further, the packaging bag for a microwave oven is heated by the heat when food is cooked in a microwave oven. Therefore, when the food is taken out of the microwave oven, there is a danger of being burned if the food is grasped as it is.

[0007] Further, although the packaging bag for a microwave oven is provided with pressure relief means, when the microwave oven is heated, the packaging bag is in an inflated state. Before ending, the microwave oven was stopped, and cooking was sometimes insufficient. In particular, in the case of a configuration in which a part of the back adhering portion of the packaging bag is peeled off by internal pressure to form a relief port, the inner pressure becomes higher because a part of the back adhering portion is peeled off by internal pressure. The above-mentioned problem tends to be remarkable.

[0008] The present invention can solve the above-mentioned problems observed when the packaging bag is heated by microwave oven, is easy to prepare for cooking, and can stabilize the shape of the packaging bag when heating the microwave oven. It is an object of the present invention to provide a heat-insulating exterior bag and a microwave-heated package which can be applied to the outer packaging of a packaging bag provided with a pressure-releasing portion such as a back affixing portion. is there.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention has been made as a heat-insulating exterior bag and a microwave oven-heated package. Insulating exterior bag applied to the outer packaging, wherein the insulating exterior bag main body 6 is composed of a sheet having flexibility and heat insulating properties. The point is that a separating and opening means for exposing the pressure relief portion 7 is provided.

The microwave oven package is characterized by a microwave oven packaging bag 1 having a pressure relief portion 7 and a flexible and heat insulating sheet for packaging the envelope bag 1. And a heat-insulating exterior bag 5 having a heat-insulating exterior bag body 6, wherein the heat-insulating exterior bag body 6 is formed so that the pressure relief portion 7 can be exposed.

Since the microwave-heated packaging bag 1 containing the contents is packaged in a heat-insulating exterior bag 5 having heat insulating properties, even if the contents are frozen foods or the like, the contents can be stored at the time of distribution. It has a cooling effect at the time of sale.

Further, when heating in a microwave oven, a part of the heat-insulating exterior bag 5 is opened by the separating and opening means, and the pressure relief portion 7 of the microwave heating packaging bag is exposed from the opening. Since the internal pressure in the microwave heating packaging bag can be released, it is not necessary to remove the heat-insulating exterior bag 5 from the microwave heating packaging bag 1. In addition, even when the microwave heating packaging bag expands due to the internal pressure during microwave heating, the heat insulating exterior bag 5 easily bends and deforms along the microwave heating packaging bag 1 and the microwave heating packaging bag 1
To prevent the contents from spilling into the microwave oven even if the microwave oven packaging bag 1 ruptures.

Further, even if the contents in the microwave-heated packaging bag are heated, since the heat-insulating exterior bag 5 has a heat-insulating function, it does not become hotter than the packaging bag 1. Therefore, the consumer can safely take out the microwave-heated packaging bag 1 whose contents are sufficiently heated from the microwave oven and squeeze out the contents on a dish or the like.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a microwave oven package according to an embodiment of the present invention will be described with reference to the drawings. 1 and 2, reference numeral 1 denotes a packaging bag for a microwave oven for packaging contents such as food, and the bag 1 has a plastic film 2 such as biaxially oriented polyester or biaxially oriented polyamide as a base material, Plastic film 3 with a heat-fusible resin such as polyethylene or polypropylene laminated on the innermost layer
Consists of

[0015] Examples of the content A include various foods such as oden with dashi, pork stew with sauce, hemp figure tofu, bowl ingredients, grilled meat with sauce, curry stew, soup and the like.

The plastic film 3 is folded so as to form a bag by itself or a plurality thereof so that the heat-fusible resin layers on the inner surface thereof are opposed to each other. Are folded so as to overlap with each other, and a back adhering portion 7 is formed by adhering the inner surfaces of the ends (the joint surfaces).

Incidentally, as the bag having the back adhering portion 7, a conventionally known bag can be adopted, for example, Japanese Patent Application Laid-Open No. H10-72070.
JP-A-10-310181, JP-A-11-130
No. 159, JP-A-11-29181 and JP-A-10-1
Nos. 52177 and JP-A-9-150864 can be exemplified.

As shown in FIG. 6 (a), the back affixing portion 7 is opened by, for example, spontaneously peeling off the weak seal portion d, the fragile portion, and the like using the internal pressure of the packaging bag 1 for a microwave oven. There is a type in which the relief port c is opened by partially cutting, as shown in FIG.

The former-type back-attached portion 7 is left as it is, and the latter-type back-attached portion 7 is partially cut to release the pressure relief port c.
Is opened, the microwave packaging bag 1 is placed on a turntable in a microwave oven, for example, on a turntable, with the back-adhering portion 7 facing upward, and placed horizontally.

The whole of the microwave packaging bag 1 is hermetically housed in a heat-insulating exterior bag 5. The heat-insulating exterior bag 5 includes a heat-insulating exterior bag main body 6 composed of a packaging film 9, and a cross section showing an example of the packaging film 9 is shown in FIG. 4. The packaging film 9 shown in FIG. 4A has a base sheet 10 having a printed surface 11 on one side (inner surface), a foamed resin layer 12, and a heat-bonding film layer (heat-fusible resin layer) 13. Are composed of a laminate laminated in this order.

As the substrate sheet 10, for example, a polyester film (for example, polyethylene terephthalate,
Plastic films such as polybutylene terephthalate), polyolefin films (for example, polypropylene resin such as polypropylene and propylene-ethylene copolymer), plastic films such as polystyrene film and polyamide film, paper, synthetic paper, or nonwoven fabric Or, a laminated body of these and the like are exemplified.

The base sheet 10 is made of a non-stretched film,
Although any of a uniaxially or biaxially stretched film may be used, it is preferable to use a stretched film, particularly a biaxially stretched film. Among the above-described base sheets 10, a plastic film is preferable in terms of excellent water resistance, and a polyester film such as a polyethylene terephthalate film is particularly preferable in terms of printability and heat resistance that can withstand heat during heat sealing.

It is also preferable to use a film having good tearability as the base sheet 10 in order to facilitate opening. Such a film having a good tearing property is, for example, stretched in one direction (horizontal direction or vertical direction).
It can be produced by giving an orientation. It should be noted that such a film having good tearing properties may be laminated separately from the base sheet 10.

The thickness of the base sheet 10 can be appropriately selected within a range that does not impair the strength and the like as a base material.
μm, preferably about 6 to 30 μm. The surface of the base sheet 10 on which the printing 11 is performed may be subjected to a conventional surface treatment such as a corona discharge treatment, a plasma treatment, a flame treatment, and an acid treatment in order to improve printability.

The printing 11 is performed to a thickness of, for example, about 0.5 to 8 μm using a conventional printing ink and a conventional printing method (for example, gravure printing, letterpress printing, flat plate printing, screen printing, transfer printing, etc.). be able to. The printing 11 may be performed on the side of the base sheet 10 opposite to the foamed resin layer 12.

The resin constituting the foamed resin layer 12 includes:
The resin is not particularly limited as long as it is a foamable resin, and examples thereof include polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyurethane, and methacrylic resin. Olefin resins are particularly preferred. The foaming method may be any of a physical foaming method, a chemical foaming method, and the like. The expansion ratio can be appropriately selected within a range that does not impair the heat insulating property, strength, and the like, and is, for example, about 10 to 50 times, and preferably about 30 to 40 times. Foam resin layer 1
2 can be formed by a conventional foam molding method such as extrusion foam molding.

The thickness of the foamed resin layer 12 can be appropriately set within a range that does not impair the heat insulating property, the opening property, and the like.
About 00 to 1500 μm, preferably 250 to 1000
It is about μm. The lamination of the foamed resin layer 12 and the base sheet 10 can be performed by a conventional laminating method, for example, dry lamination with an adhesive, thermal lamination in which heat and pressure are applied across a heat-adhesive layer, and the like.

The heat-fusible resin constituting the heat-fusible resin layer 13 is not particularly limited as long as it is a resin that can be heat-fused. The heat fusion method may be any of an external heating method of heat sealing and impulse sealing, and an internal heating method of ultrasonic bonding and high frequency bonding. Typical examples of heat-sealable resins include polyethylene (high-density polyethylene, linear low-density polyethylene, etc.), polypropylene,
Examples include an ethylene-vinyl acetate copolymer.

The thickness of the heat-fusible resin layer 13 can be selected within a range that does not impair the heat-fusibility and the opening property.
It is about μm, preferably about 7 to 50 μm. The heat-fusible resin layer 13 can be laminated by a conventional lamination method such as extrusion lamination and dry lamination.
When the foamed resin layer 12 has a heat-fusing property, it is not always necessary to provide the heat-fusing resin layer 13. However, considering the suitability of a packaging machine and the like, the heat-fusing resin layer 13 is formed. It is preferable to provide them. Further, the heat-fusible resin layer 13 may be provided between the foamed resin layer 12 and the base sheet 10.

In forming the heat-insulating exterior bag 5, a four-side seal packaging bag for heat-sealing the four sides 9a of the two packaging films 9 as shown in FIG. A three-sided pillow packaging bag formed by forming a single packaging film 9 in a tubular shape and applying a vertical seal 9b and a horizontal seal 9c as described above is exemplified.

A portion of the heat-insulating exterior bag 5 corresponding to the back adhering portion 7 and one side of the heat-insulating exterior bag 5 are formed so that the heat-insulating exterior bag 5 can be broken in the circumferential direction so as to be opened with a predetermined width. A notch 17 is provided as a separating and opening means. An opening knob 18 such as an adhesive label is attached to the surface of the heat-insulating exterior bag 5 so as to close the cut 17. In such a case, the packaging film 9 constituting the heat-insulating exterior bag 5 easily tears from one side to the other side (for example, a configuration in which a uniaxially stretched film is laminated).
Has become. In addition, the shape of the notch 17 can be any shape, such as a V-shape or a U-shape, which triggers the breaking of the heat-insulating exterior bag 5.

The package for a microwave oven having the above-mentioned structure is distributed and sold in a store at a low temperature especially when the content is a frozen food or a chilled food. Since the heat-insulating exterior bag 5 has heat-insulating properties, it exerts a cooling function. Therefore, the temperature of the contents can be maintained at the time of distribution of the microwave oven package or until the consumer purchases the microwave oven package and takes it back.

Further, when the content is cooked by a microwave oven, when the knob 18 is picked and pulled, the heat-insulating exterior bag 5 is broken into two strips starting from the cut 17, thereby forming a strip. The cut-away portion 20 is broken (see FIG. 7). As a result, the opening 22 can be formed on the upper surface of the heat-insulating exterior bag 5 from substantially one side to the other of the heat-insulating exterior bag 5.

The opening 22 coincides with the back pasting portion 7 of the microwave packaging bag 1, and the back pasting portion 7 can be exposed to the outside through the opening 22. When the back affixing part 7 is packaged with the heat-insulating exterior bag 5, it is pushed by the heat-insulating exterior bag 5 and restrained in a prone state (see FIG. 2). It is released from the restraint from the bag 5 and can be easily erected as shown in FIG. The detaching and opening operation of the separating and opening part 20 can be performed by one-touch operation, and preparation for heating cooking can be performed easily, quickly, and reliably.

During heating in the microwave oven, water vapor is generated from the food in the microwave oven packaging bag 1 and the microwave oven packaging bag 1
The pressure inside rises. In the packaging bag 1, a portion in the vicinity of the back adhering portion 7 is exposed to the outside through the opening 22, and the remaining portion is stored in the heat-insulating exterior bag 5. Thus, the packaging bag for microwave oven 1 tends to expand due to a rise in the internal pressure. However, most of the packaging bag for microwave oven 1 is prevented from expanding more than a predetermined amount by the thermal insulation packaging bag 5, and Due to the flexibility possessed, substantially the entirety of the heat-insulating exterior bag 5 is deformed and adheres to the microwave oven packaging bag 1, so that the overall shape is stabilized.
In addition, the stabilization of the shape reduces the fear or anxiety of the consumer such as burst.

Also, as shown in FIG. 3, during heating in the microwave oven, the back pasting portion 7 protrudes outside through the opening 22 of the heat-insulating exterior bag 5, so that steam for pressure relief is removed from the packaging bag 1 for the microwave oven. It can be discharged stably and reliably to the outside.

In addition, since the surface of the heat-insulating exterior bag 5 does not become hot due to the heat of the food A due to the heating in the microwave oven, it can be easily taken out of the microwave oven with the heat-insulating exterior bag 5 after cooking. Next, as shown in FIG. 8, the insulating packaging bag 5 is broken in the circumferential direction, for example, along the separation opening portion 20 and the edge of the insulating packaging bag 5, and the packaging bag 1 for the microwave oven is exposed. Cut one side and open. Then, the user can safely take out the food A in the packaging bag 1 for microwave oven by tilting by holding the bag 5 for heat-insulating exterior.

In the above-described example, the cut 17 and the opening knob 18 are used in combination as the cutting and opening means, but the cutting and opening means is a perforation for cutting (perforation).
May be formed singly or plurally in the circumferential direction of the heat-insulating exterior bag 5.

FIG. 4B is a cross-sectional view showing another example of the packaging film 9 constituting the heat-insulating exterior bag 5. This packaging film 9 has a light-shielding layer 26 between the substrate sheet 10 on which the print 11 is applied and the foamed resin layer 12 for blocking light that is going to be transmitted through the heat-insulating exterior bag 5. Only the difference from the packaging film of FIG.

The light-shielding layer 26 is provided with a silver ink layer containing, for example, tin vapor deposition or aluminum fine powder, and can be made of a material which does not cause a spark or the like by heating in a microwave oven.

The heat-insulating exterior bag 5 formed of the packaging film 9 having the light-shielding layer 26 has a remarkably high light-shielding property and transmits microwaves emitted from a microwave oven regardless of the quality. Therefore, there is no hindrance to heating and cooking.

In the present invention, the biaxially stretched polyamide layer is provided between the base sheet 10 on which the printing 11 is applied and the foamed resin layer 12 or on the side of the foamed resin layer 12 opposite to the base sheet 10. May be provided.

The present invention is not limited to the above embodiment. For example, as shown in FIG. 9, a standing pouch type microwave oven pouch 1 may be covered with a standing pouch-shaped heat insulating exterior body 5 having heat insulating properties. Such a pouch for microwave oven 1 is not provided with the back stuck portion, and the pouch for microwave oven 1 is not provided.
The upper corner (relief portion) 1b is cut. In addition, the upper part 5b of the heat-insulating exterior body 5 can also be cut off along the perforation or the like to open the heat-insulating exterior body 5 to expose the relief port of the microwave oven pouch 1. .

The pouch 1 for a microwave oven of the standing pouch type according to the present embodiment has an advantage that it can be cooked in an independent state. Further, in order to open the heat-insulating exterior bag main body 6 so as to expose the pressure relief portion 7, it is not necessary to always provide a cut-off opening means in the heat-insulating exterior bag main body 6, and for example, with scissors or the like. You may make it cut | disconnect the bag main body 6 for heat insulation exterior.

Further, as shown in FIGS. 10 to 12, the surface of the heat-insulating exterior body 5 may be subjected to unevenness processing. Specifically, a mold (such as embossing with a hot embossing roll) 30
Thus, the embossing 31 is performed on the surface of the packaging film 9 before bag making. The concavo-convex surface shape of the embossing can be arbitrarily set, and examples thereof include a rectangular shape, a circular shape, an elliptical shape, and a combination thereof. Further, the width and depth of the concave portion (concave groove) B as a thin portion can be arbitrarily set, and the dimension L per one pitch of the emboss convex portion (thick portion) A and the concave portion B is 1 to 1. About 10 mm is preferable. The depth of the recess B is preferably about 0.01 to 1 mm. Furthermore, the cross-sectional shape of the emboss is not particularly limited, and may be any shape as long as heat insulation is obtained.

As described above, by embossing 31 on the surface of the packaging film 9, for example, in the case of a package containing frozen food, even if the surface of the heat-insulating exterior body 5 is frozen before cooking. By having the uneven surface of the packaging film 9, the package is hard to slide down. In addition to the heat insulating effect of the foamed resin layer 12 itself, the heat insulating effect can be further obtained by reducing the contact area of the heat insulating exterior body 5 by embossing.

[0047]

As described above, the present invention relates to a microwave oven-heated packaging bag having a pressure relief portion, and a package for packaging the packaging bag.
A heat-insulating exterior bag made of a sheet having flexibility and heat-insulating properties, wherein the heat-insulating exterior bag is capable of exposing the relief portion to the outside. Can be easily and easily performed, and the shape of the packaging bag can be stabilized during heating in the microwave oven, so that a sense of security can be given to the consumer.

[Brief description of the drawings]

FIG. 1 is an overall perspective view including a partial cross section showing one embodiment of a microwave oven-heated package according to the present invention.

FIG. 2 is an overall sectional view before heating the microwave oven.

FIG. 3 is an overall sectional view of the microwave oven in a heated state.

FIGS. 4A and 4B are cross-sectional views of a packaging film.

FIGS. 5A and 5B are plan views of a microwave-heated package.

FIGS. 6A and 6B are front views of a back pasting portion.

FIG. 7 is a perspective view showing a state in which the heated microwave oven package is opened after heating.

FIG. 8 is a perspective view showing a state in which the food heated by the microwave oven is taken out.

FIG. 9 is an overall perspective view showing another embodiment of the microwave-heated package according to the present invention.

FIG. 10 is an overall perspective view including a partial cross section showing another embodiment of the microwave oven-heated package according to the present invention.

11A is a perspective view of a packaging film, and FIG. 11B is a cross-sectional view of a state where the packaging film is embossed.

FIG. 12 shows an uneven shape formed on a packaging film;
(A) is a plan view, (B) is a cross-sectional view.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Microwave heating packaging bag, 5 ... Insulation exterior bag, 7 ... Back part (pressure relief part), 6 ... Insulation exterior bag main body, 26 ... Light shielding layer, 31 ... Emboss processing

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B65D 81/34 B65D 81/34 U F24C 7/02 551 F24C 7/02 551L 551N F-term (Reference) 3E064 AA05 BA21 BB03 FA03 HP10 3E067 AA11 AB01 BA12B BA12C BA28C BB14B BB14C BB15B BB16B BB25B CA12 CA18 EB03 EB07 EE07 GB01 GD08 3L086 AA01 BF01 BF02 BF03 BF05 DA01 4B055 AA10 CC07 CA07 DB01

Claims (6)

[Claims] 1. A heat insulating exterior bag applied to the outer packaging of a microwave heating packaging bag (1) having a pressure relief portion (7), comprising a flexible and heat insulating sheet to a heat insulating exterior bag. A main body (6) is configured, and the heat-insulating exterior bag main body (6) includes:
A heat-insulating exterior bag for a microwave-heated packaging bag, further comprising a cut-off opening means for exposing a pressure relief portion (7) of the microwave-heated packaging bag. 2. A light-shielding layer (26) for blocking light that is going to penetrate into the heat-insulating exterior bag body (6).
The heat-insulating exterior bag of the microwave-heated packaging bag according to claim 1, further comprising: 3. The surface of the heat-insulating exterior bag body (6)
The heat-insulating exterior bag of the microwave-heated packaging bag according to claim 1, which has been subjected to unevenness processing. 4. A heat insulating exterior bag comprising a microwave heating packaging bag (1) having a pressure relief part (7) and a flexible and heat insulating sheet for packaging the packaging bag (1). A microwave oven having a bag body (6) having a bag body (6), wherein the heat-insulating exterior bag body (6) is formed so as to expose the relief portion (7). Heated package. 5. The microwave oven packaging bag (1) is made of a plastic film, and the pressure relief portion (7) is
The heat-insulating exterior bag (5) is provided with a cut-off opening means for exposing the back-adhered portion, the back-adhered portion being formed by adhering the inner surfaces of the laminated plastic films to each other. Item 6. A microwave-heated package according to Item 4. 6. A surface of the heat-insulating exterior bag body (6),
The microwave oven-heated package according to claim 4, which has been subjected to unevenness processing.