JP3476427B2 - Insulated exterior bag and microwave oven package - Google Patents

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 oven heating packaging bag, and more particularly to a heat insulating outer packaging bag applied to the outer packaging of a packaging bag in which food or the like is hermetically filled so that it can be heated by a microwave oven. And a microwave oven heating package.

[0002]

2. Description of the Related Art Recently, a packaging bag containing cooked foods that can be heated in a microwave oven has been in widespread use. Such a microwave oven heating package is very convenient because it can be heated in a microwave oven as it is. However, when heating food in a microwave oven, a large amount of water vapor is generated and the internal pressure of the packaging bag gradually rises while the heating is continued. Therefore, if the packaging bag is not provided with a pressure relief means, the packaging bag will be in an excessively expanded state, and in the worst case, there is a risk of rupture.

Conventionally, as the pressure relief means, for example, Japanese Patent Laid-Open No. Hei 11
In Japanese Patent Publication No. 99065, there is a type in which an opening notch is formed in a corner portion of a microwave oven heating packaging bag, and the corner portion of the packaging bag is cut out and opened based on the notch when used to form a pressure relief port. Proposed. In addition, the applicant of the present invention, for example, in JP-A-10-72070, JP-A-10-310181, and JP-A-11-130159, provides a back sticking portion on the upper surface of the packaging bag as a pressure relief portion, and when using the back sticking portion, We have proposed a structure in which a part of the back sticking part is cut off or a part of the back sticking part is weakly adhered to peel off a part of the back sticking part by internal pressure to form a pressure relief port.

The packaging bag for the microwave oven is distributed and sold in a state of being housed in a paper exterior box for the purpose of protection and the like.

[0005]

When heating food in a microwave oven, the consumer takes out the packaging bag for the microwave oven from the outer box, and preparation for cooking is troublesome.

[0006] In addition, since the packaging bag for a microwave oven becomes hot due to the heat when food is cooked in the microwave oven, there is a risk of burns if grasped as it is when taken out from the microwave oven.

Further, although the packaging bag for the microwave oven is equipped with a pressure relief means, the packaging bag is in an expanded state when heated in the microwave oven, so that the consumer considers the risk of rupture and completes the cooking. Before finishing, the microwave oven was stopped, and there were cases where cooking was inadequate. In particular, in the case of a structure in which a part of the back sticking part of the packaging bag is peeled off by the internal pressure to form the pressure relief port, a part of the back sticking part is peeled off by the internal pressure, so the internal pressure becomes However, the above problems tend to become more prominent.

The present invention can solve the above-mentioned problems observed when the packaging bag is cooked in a microwave oven, can be easily prepared for cooking, and can stabilize the shape of the packaging bag when the microwave oven is cooked. It is an object to provide a heat-insulating outer bag and a microwave heating package that can be used for the outer packaging of a packaging bag that can erase the feeling and that is particularly provided with a pressure-relieving portion such as a back-sticking portion. is there.

[0009]

The present invention SUMMARY OF THE INVENTION has been made as bag insulation exterior and microwave heating package in order to solve the above problems, superimposed plastic off
The pressure relief part 7 is formed on the back pasting part where the inner surfaces of the film are adhered to each other.
A heat-insulating exterior bag applied to the outer packaging of the microwave oven heating packaging bag 1 made of the formed plastic film ,
Outside of heat insulation composed of flexible and heat insulating sheets
Separation and opening means is provided in the body bag body 6, and the separation and opening means
When an opening is formed in the heat insulating exterior bag body 6 by the means,
The spine sticking part is exposed to the outside through the opening .

Further, the feature of the microwave heating package is that the inner surfaces of the laminated plastic films are
A plastic stick in which the pressure relief portion 7 is formed on the adhered back attachment portion.
A microwave oven heating packaging bag 1 made of a film , and an insulating exterior bag 5 having an insulating exterior bag body 6 made of a flexible and heat-insulating sheet for packaging the packaging bag 1. The heat-insulating exterior bag body 6 has a separating and opening means.
Is provided, and the heat insulating exterior bag body 6 is provided by the separating and opening means.
When the opening is formed in the
It is exposed to the department .

Since the microwave oven heating packaging bag 1 in which the contents are stored is packaged in the heat insulating exterior bag 5 having heat insulating properties, even when the contents are frozen foods, etc. It has a cooling effect at the time of sale.

When heating in a microwave oven, a part of the heat-insulating outer bag 5 is opened by the separating / opening means, and the 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. Moreover, even when the microwave oven heating packaging bag expands due to internal pressure during microwave heating, the heat insulating exterior bag 5 is easily curved and deformed along the microwave oven heating packaging bag 1, and the microwave oven heating packaging bag 1
To prevent the contents from spilling into the microwave oven even if the microwave oven heating packaging bag 1 ruptures.

Further, even if the contents in the microwave heating package bag are heated, the heat insulating outer bag 5 does not become hot as compared with the package bag 1 since it has a heat insulating function. Therefore, the consumer can safely take out the microwave oven heating packaging bag 1 in which the contents are sufficiently heated from the microwave oven and squeeze out the contents on a plate or the like.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION A microwave package according to an embodiment of the present invention will be described below with reference to the drawings. 1 and 2, 1 is a packaging bag for microwave ovens for packaging contents such as foods, and this bag 1 has a plastic film 2 such as biaxially oriented polyester or biaxially oriented polyamide as a base material, A plastic film 3 in which a heat-fusible resin such as polyethylene or polypropylene is laminated on the innermost layer
Consists of.

Examples of the content A include various foods such as oden with dashi, simmered pork simmered in sauce, hemp tofu, bowl ingredients, grilled meat with sauce, curry stew and soup.

The plastic film 3 is singly or plurally folded so that the heat-fusible resin layers on the inner surfaces face each other so as to form a bag. Are folded so as to overlap with each other, and the inner surface of the end portion (the palm surfaces) is bonded to each other, and the back bonding portion 7 is provided.

As the bag having the back sticking portion 7, a conventionally known bag can be adopted, for example, Japanese Patent Laid-Open No. 10-72070.
JP-A-10-310181 and JP-A-11-130
159, JP-A-11-29181, and JP-A-10-1.
Examples are those described in JP-A No. 52177 and JP-A No. 9-150864.

As shown in FIG. 6 (a), the back attaching portion 7 is roughly divided into the weak sealing portion d, the fragile portion and the like by spontaneously peeling off the weak sealing portion d and the weak portion using the internal pressure of the microwave oven packaging bag 1. There are two types, one type and one type in which the pressure relief port c is opened by partially cutting as shown in FIG.

The former type back-adhered portion 7 is left as it is, and the latter type back-adhered portion 7 is partially cut to release the pressure c.
After opening, the microwave packaging bag 1 is placed in a microwave oven, for example, on a turntable with the spine sticking portion 7 on the upper side, and is horizontally laid down for heating.

The microwave packaging bag 1 is entirely housed in a heat-insulating exterior bag 5 in a sealed manner. The heat-insulating outer bag 5 includes a heat-insulating outer bag body 6 formed of a packaging film 9, and a cross section showing an example of the packaging film 9 is shown in FIG. The packaging film 9 shown in FIG. 4A has a base sheet 10 having a print 11 on one surface (inner surface), a foamed resin layer 12, and a heat-bondable film layer (heat-fusible resin layer) 13. And are composed of a laminated body laminated in this order.

The base sheet 10 is, for example, a polyester film (eg polyethylene terephthalate,
Films such as polybutylene terephthalate), polyolefin films (for example, films such as polypropylene and polypropylene resins such as propylene-ethylene copolymer), polystyrene films, plastic films such as polyamide films, paper, synthetic paper, or non-woven fabric. Or the laminated body etc. of these are mentioned.

The base sheet 10 is an unstretched film,
Either a uniaxially or biaxially stretched film may be used, but it is preferable to use a stretched film, particularly a biaxially stretched film. Among the above-mentioned substrate 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 capable of withstanding heat during heat sealing.

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

The thickness of the substrate sheet 10 can be appropriately selected within a range that does not impair the strength as a substrate, and is, for example, 6 to 70.
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 corona discharge treatment, plasma treatment, flame treatment, and acid treatment in order to improve printability.

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

As the resin forming the foamed resin layer 12,
It 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. Olefinic resins are particularly preferred. The foaming method may be either a physical foaming method, a chemical foaming method, or the like. The expansion ratio can be appropriately selected within a range that does not impair the heat insulating property, strength, etc., and is, for example, about 10 to 50 times, 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 unsealing property, etc.
About 00 to 1500 μm, preferably 250 to 1000
It is about μm. The foamed resin layer 12 and the base material sheet 10 can be laminated by a conventional laminating method, for example, dry lamination using an adhesive, thermal lamination in which a thermoadhesive layer is sandwiched and adhered by heat and pressure.

The heat-fusible resin forming the heat-fusible resin layer 13 is not particularly limited as long as it is a heat-fusible resin. The heat fusion method may be any of an external heating method such as heat sealing and impulse sealing, and an internal heating method such as ultrasonic bonding and high frequency bonding. Typical examples of heat-sealable resins include polyethylene (high-density polyethylene, linear low-density polyethylene, etc.), polypropylene,
Examples thereof include 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 fusible property and the unsealing property, and is, for example, 5 to 200.
The thickness is about μm, preferably about 7 to 50 μm. The heat-fusible resin layer 13 can be laminated by a conventional laminating method such as extrusion lamination and dry lamination.
In addition, when the foamed resin layer 12 has a heat-fusible property, it is not always necessary to provide the heat-fusible resin layer 13. However, in consideration of suitability for a packaging machine, the heat-fusible resin layer 13 is It is preferable to provide it. Further, the heat-fusible resin layer 13 may be provided between the foamed resin layer 12 and the base material sheet 10.

When forming the heat-insulating outer bag 5, as shown in FIG. 5 (a), a four-sided sealed packaging bag in which four sides 9a of two packaging films 9 are heat-sealed, or shown in FIG. 5 (b). As described above, a three-way pillow packaging bag in which a single packaging film 9 is formed into a tubular shape and a vertical seal 9b and a horizontal seal 9c are applied can be given.

A portion of the heat insulating outer bag 5 corresponding to the spine sticking portion 7 and one side of the heat insulating outer bag 5 is formed so that the heat insulating outer bag 5 can be circumferentially broken and opened with a predetermined width. A notch 17 as a separating and opening means is engraved. Then, a tab 18 for opening such as a sticking label piece is stuck on the surface of the heat insulating outer bag 5 so as to close the notch 17. In such a case, the packaging film 9 forming the heat-insulating exterior bag 5 easily tears from one side to the other (for example, a configuration in which uniaxially stretched films are laminated)
Has become. The shape of the notch 17 may be any shape such as a V shape or a U shape, which triggers the breakage of the heat insulating exterior bag 5.

The microwave oven package having the above-mentioned structure is distributed and sold at a store in a low temperature state, especially when the contents are frozen foods or chilled foods. Since the heat-insulating exterior bag 5 has a heat insulating property, it exhibits a cold insulating function. For this reason, the temperature of the contents can be maintained at the time of distribution of the microwave package, or until the consumer purchases the microwave package and takes it home.

Further, when the contents are heated and cooked by the microwave oven, if the picking piece 18 is picked and pulled, the heat insulating outer bag 5 will be broken into two strips starting from the notch 17, and a strip shape will be formed. The separation / opening 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 side of the heat insulating exterior bag 5.

The opening 22 coincides with the back sticking portion 7 of the microwave oven packaging bag 1, and the back sticking portion 7 can be exposed to the outside through the opening 22. In the state in which the back sticking portion 7 is packaged in the heat insulating exterior bag 5, it is pushed by the heat insulating exterior bag 5 and is restrained in the lying state (see FIG. 2), but after being exposed to the outside, it is used as the heat insulating exterior bag. It is released from the restraint from the bag 5 and can be easily erected as shown in FIG. The opening operation of the separation / opening portion 20 can be performed by a one-touch operation, and the preparation for heating and cooking can be performed easily, easily, and surely.

During heating in the microwave oven, water vapor is generated from the food in the microwave packaging bag 1, and the microwave packaging bag 1 is produced.
The pressure inside rises. The packaging bag 1 is exposed to the outside through the opening 22 in the vicinity of the spine sticking portion 7, and the rest of the packaging bag 1 is housed in the heat insulating exterior bag 5. Thus, the microwave oven packaging bag 1 tries to expand due to the increase in the internal pressure, but most of the microwave oven packaging bag 1 is prevented from expanding beyond a predetermined level by the heat insulation exterior bag 5 and the heat insulation exterior bag 5 Due to the flexibility of the heat-insulating outer bag 5, substantially the entire heat-insulating outer bag 5 is deformed and adheres to the microwave oven packaging bag 1, and the overall shape is stabilized.
Further, this shape stabilization reduces the fear or anxiety of consumers such as bursting.

Further, as shown in FIG. 3, during heating of the microwave oven, since the back attaching portion 7 projects to the outside from the opening 22 of the heat-insulating outer bag 5, steam for depressurizing water is removed from the microwave packaging bag 1. It can be discharged stably and reliably to the outside.

Moreover, since the surface of the heat insulating outer bag 5 is not heated by the heat of the food A due to the microwave heating, it can be easily taken out from the microwave oven with the heat insulating outer bag 5 after cooking. Next, as shown in FIG. 8, for example, the heat-insulating outer bag 5 is circumferentially broken along the edges of the separation / opening portion 20 and the heat-insulating outer bag 5, and the microwave packaging bag 1 is exposed. Cut one side to open. By holding and inclining the heat-insulating exterior bag 5, the food A in the microwave packaging bag 1 can be safely taken out to a plate or the like.

Further, in the above-mentioned example, the notch 17 and the opening tab 18 are used together as the cutting and unsealing means, but the cutting and unsealing means is the perforation for cutting.
May be formed in a single line or plural lines in the circumferential direction of the heat insulating exterior bag 5.

FIG. 4B is a sectional view showing another example of the packaging film 9 which constitutes the heat insulating outer bag 5. This packaging film 9 has a light-shielding layer 26 between the base sheet 10 on which the printing 11 has been applied and the foamed resin layer 12 for blocking light that tries to penetrate into the heat-insulating exterior bag 5. Only the packaging film of FIG. 4 (a) is different.

The light-shielding layer 26 is, for example, a layer on which a silver-colored ink layer containing tin vapor deposition or fine aluminum powder is applied, and a layer which does not cause sparks or the like when heated in a microwave oven can be used.

In the heat-insulating outer bag 5 formed of the packaging film 9 having the light-shielding layer 26 as described above, the light-shielding property is remarkably high and the microwave radiated from the microwave oven is transmitted though the quality can be maintained. Therefore, it does not interfere with cooking.

In the present invention, a biaxially stretched polyamide layer is provided between the printed base material sheet 10 and the foamed resin layer 12 or on the side of the foamed resin layer 12 opposite to the base material 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 type heat insulating outer casing 5 having heat insulating properties. Such microwave oven pouch 1 is not provided with the back sticking portion, and the microwave oven pouch 1
The corner (relief part) 1b at the upper part of is cut. Further, the upper portion 5b of the heat insulating outer casing 5 can also be divided along the cut-and-seal means such as perforations to open the heat insulating outer casing 5 and expose the relief port of the microwave oven pouch 1. .

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

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 surface of the packaging film 9 before bag making is embossed 31. The embossed concavo-convex surface shape can be set arbitrarily, and examples thereof include a rectangular shape, a circular shape, an elliptical shape, and a combination thereof. Further, the width and the depth of the concave portion (concave groove) B as the thin portion can be arbitrarily set, and the dimension L per pitch of the embossed convex portion (thick portion) A and the concave portion B is from 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.

By thus performing the embossing 31 on the surface of the packaging film 9, for example, in the case of a package containing frozen foods, even if the surface of the heat insulating exterior body 5 is frozen before cooking. Since the wrapping film 9 has the uneven surface, the package does not easily slip off. Further, in addition to the heat insulating effect by the foamed resin layer 12 itself, a further heat insulating effect can be obtained by reducing the contact area of the heat insulating exterior body 5 by embossing.

[0047]

As described above, according to the present invention, a microwave oven heating packaging bag having a pressure-relief portion and a packaging bag for packaging the packaging bag are provided.
A heat-insulating exterior bag made of a flexible and heat-insulating sheet is provided. The heat-insulating exterior bag is capable of exposing the pressure relief portion to the outside. The packaging bag can be easily and easily carried out, and the shape of the packaging bag can be stabilized at the time of heating in a microwave oven, so that the consumer can feel secure.

[Brief description of drawings]

FIG. 1 is an overall perspective view including a partial cross section showing an embodiment of a microwave oven heating package of 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.

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

5A and 5B are plan views of the microwave oven heating package.

FIG. 6A and FIG. 6B are front views of the back attachment part.

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

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

FIG. 9 is an overall perspective view showing another embodiment of the microwave oven heating package of the present invention.

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

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

FIG. 12 shows the concavo-convex shape formed on the packaging film,
(A) is a plan view and (B) is a sectional view.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Microwave oven heating packaging bag, 5 ... Heat insulation exterior bag, 7 ... Back sticking part (pressure relief part), 6 ... Heat insulation exterior bag body, 26 ... Light-shielding layer, 31 ... Embossing

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI B65D 81/34 B65D 81/34 U F24C 7/02 551 F24C 7/02 551L 551N (56) Reference JP-A-9-77135 ( JP, A) JP 11-222269 (JP, A) JP 10-287379 (JP, A) Actually open 6-44775 (JP, U) Actually open 62-101763 (JP, U) (58 ) Fields surveyed (Int.Cl. ⁷ , DB name) A47J 27/00 107 B65D 30/08 B65D 33/00 B65D 77/30 B65D 81/30 B65D 81/34 F24C 7/02

Claims (6)

(57) [Claims] 1. A laminated plastic film
The pressure relief part (7) is formed on the back bonding part where the inner surfaces are bonded together.
Which is applied to the outer packaging of the microwave oven heating packaging bag (1) made of the plastic film ,
Outside of heat insulation composed of flexible and heat insulating sheets
The body (6) of the wearing bag is provided with a tear-opening means,
An opening is formed in the heat insulating exterior bag body (6) by the opening means.
Is the microwave heating package bag insulation exterior bag that the back lined section through the opening is characterized and this <br/> exposed to the outside. 2. The light-insulating outer bag body (6) has a light-shielding layer (26) for blocking light that is transmitted to the inside.
The heat-insulating exterior bag for the microwave heating packaging bag according to claim 1, wherein the bag is provided. 3. The surface of the heat-insulating exterior bag body (6) comprises:
The heat-insulating exterior bag for a microwave oven heating packaging bag according to claim 1, wherein the bag is provided with unevenness. 4. A laminated plastic film
The pressure relief part (7) is formed on the back bonding part where the inner surfaces are bonded together.
A microwave heating packaging bag (1) made of a plastic film , and a heat insulating outer packaging bag body (6) made of a flexible and heat insulating sheet for packaging the packaging bag (1). and a heat insulating outer bag (5), wherein the insulation
The outer bag body (6) is provided with a separating and opening means,
An opening is formed in the heat-insulating exterior bag body (6) by the separating and opening means.
When heated, the back sticking portion is exposed to the outside through the opening . 5. The heat-insulating exterior bag body (6) has an internal
Light-shielding layer (26) for blocking light that is going to pass through
The microwave oven heating package according to claim 4, further comprising:
body. 6. The surface of the heat insulating exterior bag body (6) comprises:
The microwave oven heating package according to claim 4, wherein the microwave oven heating package is textured.