JPH0735174B2 - Packaging container - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a packaging container that accommodates foods and the like and can be cooked in a microwave oven.

[Conventional technology and its problems]

BACKGROUND ART Conventionally, there is known an instant food product in which curry, stew, or the like is filled in a plastic container body, and a lid material is adhered to the container body by heat sealing to hermetically package.

By the way, the lid material used for this type of packaging is often formed of a laminated material including a metal thin film layer such as an aluminum foil in order to improve the barrier property.

However, when the contents such as curry and stew are heated by a microwave oven, electromagnetic waves are shielded when a metal thin film layer is present in one layer of the laminated material forming the lid material, so the lid material is completely removed from the container body. After that, it was necessary to cover the opening of the container body with wrapping paper or the like.

Therefore, an object of the present invention is to eliminate the above-mentioned troubles, so that it is possible to completely remove only the metal thin film layer portion of the lid material, and therefore, the packaging that can be cooked as it is without using wrapping paper or the like. To provide a container for use.

[Means for achieving the purpose]

In order to achieve the above-mentioned object, the present invention provides a container in which a lid material having a gas barrier layer laminated on the outer surface of a synthetic resin base material whose inner surface is heat-sealed is heat-sealed on an opening flange of a container body. The layer has a metal thin film layer, and the gas barrier layer is laminated on the synthetic resin substrate via an adhesive layer and a resin layer having a weaker adhesive strength than the adhesive layer, so that the entire surface of the gas barrier layer is made of the synthetic resin substrate. From the above, the structure is such that it can be peeled off by hand, and a half cut that reaches at least the synthetic resin base material of the lid material is provided in the heat-sealing portion of the lid material with respect to the container body.

[Action]

Since the heat-sealing part of the lid material is provided with a half cut, by bending and expanding the cut, the gas barrier layer is partly peeled off at the end face of the cut, which serves as a clue for pinching with the finger, and this gas Since the barrier layer is laminated with the base material via the adhesive layer and the resin layer having a weaker adhesive strength than that, it can be easily peeled off by hand, and the microwave is reflected when the gas barrier layer is completely removed. The metal thin film layer is also removed, and the lid material and the container body made of synthetic resin remain, and since these penetrate microwaves, they can be cooked in a microwave oven as they are.

〔Example〕

 First, the structure of the lid material will be described.

As shown in FIG. 1, the lid member 1 includes a heat-sealing layer 3 on the inner surface of a synthetic resin substrate 2 and a resin layer 4 having a relatively weak adhesive strength on the outer surface.
And, a metal thin film layer 6 such as a metal foil or a metal vapor deposition film is laminated via an adhesive layer 5. A surface protective layer 7 is preferably provided on the outer surface of the metal thin film layer 6.
The layer 7 is formed by coating a synthetic resin or laminating a synthetic resin film. In addition, a printing layer can be provided on the outer surface of the layer 6.

The base material 2 includes polyester, nylon (trade name),
Polypropylene or the like is preferable, and either a simple substance or a composite thereof may be used. As the heat-sealing layer 3, polyolefin, ethylene-vinyl acetate copolymer, or the like is used. The layer 3 can be omitted if the base material 2 itself has a heat-sealing property.

The resin layer 4 has a relatively weak adhesive strength, such as vinyl resin, urethane resin, acrylic resin, polyamide resin,
It is composed of a single substance or a mixture of silicone resin, etc., and is formed by a part coat of this resin. One example of the pattern is as shown in FIG. 3 (a), (b) and (c). The uncoated portion should have a dot, linear, or grid pattern. The resin layer 4 may be provided on the metal thin film layer 6 contrary to FIG. By providing the resin layer 4 having such weak adhesive strength, the adhesive layer 5
Regardless of the type, the adhesive strength can be easily adjusted to the extent that it can be easily peeled off by hand.

As shown in FIG. 2, a reinforcing layer 6 ′ can be provided on the inner surface of the layer 6. This layer 6'is made of polyester, polypropylene, nylon, epoxy resin, etc.,
At the same time as preventing the metal thin film layer 6 from being corroded during the retort treatment, it also serves to increase the thickness of the gas barrier layer and facilitate peeling.

FIG. 4 shows a state in which the container body is sealed by the lid member 1 as described above.

As illustrated, the container body 10 has a bottom wall 11 and a peripheral wall 12 continuous with the bottom wall 11, and a flange 13 is provided on the peripheral edge of the opening. The material of the container body 10 may be a single material or a composite material such as glass, ceramics, synthetic resin or paper as long as the upper surface of the container body 10 can be heat-sealed and the microwaves can be easily transmitted. Also, the shape may be any shape such as a round shape or a square shape.

When the lid 1 is placed on the flange 13 of the container body 10 and heat-sealed, the container is completed. Of course, the contents are
It is enclosed inside the main body 10.

On the upper surface of the heat-sealing portion 14 of such a container, the lid member 1 is half-cut 8. This half cut 8
As shown in FIG. 4, it is a cut reaching at least the base material 2 and serves as a clue for peeling the metal thin film layer 6 of the lid material 1.

To use this container for cooking, first fold it so that it spreads along the half-cut 8 shown in FIG.
At the end face of the cut, the layer 6 and the base material 2 are slightly separated, so that the layer 6 can be pinched by hand. When the layer 6 is pulled together with the surface protective layer 7 by using this as a clue, the layer 6 is entirely peeled from the base material 2. Then, put this container in the microwave and cook.

When the reinforcing layer 6'is provided, it may be peeled by the above procedure together with the metal thin film layer 6.

〔effect〕

As described above, the packaging container of the present invention is tough and excellent in barrier property because the lid material is composed of a laminated body of a synthetic resin base material and a gas barrier layer having a metal thin film, and the contents of the container are altered. Can be effectively prevented, and since only the gas barrier layer can be easily peeled off by providing a half cut, even when cooking with a microwave oven, simply remove the gas barrier layer to remove wrapping paper, etc. It can be cooked as it is without using.

That is, since the packaging container of the present invention can be used consistently from distribution, storage, and cooking, it is very convenient to handle and saves labor, and at the same time, has an effect of saving resources. .

[Brief description of drawings]

1 and 2 are sectional views showing a lid member of a packaging container of the present invention, FIG. 3 is a plan view showing a pattern of an intermittent resin layer of the same as above, and FIG. 4 is a partially enlarged sectional view of the container. Is. 1 ... Lid material, 2 ... Synthetic resin base material, 3 ... Heat-sealing layer, 4
... Resin layer, 5 ... Adhesive layer, 6 ... Metal thin film layer, 6 '
…… Reinforcement layer, 7 …… Surface protection layer, 8 …… Half cut,
10 …… Container body, 11 …… Bottom wall, 12 …… Peripheral wall, 13 …… Flange, 14 …… Heat seal part.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-59-209569 (JP, A) JP-A-60-204486 (JP, A) JP-A-54-133999 (JP, A) Actual development Sho-56- 49778 (JP, U) Actual opening Sho 49-102085 (JP, U) Actual opening Sho 54-88947 (JP, U)

Claims (1)

[Claims] 1. A container in which a lid material having a gas barrier layer laminated on the outer surface of a synthetic resin substrate having an inner surface capable of heat sealing is heat sealed to an opening flange of a container body, wherein the gas barrier layer has a metal thin film layer. Then, by laminating the gas barrier layer on the synthetic resin substrate via an adhesive layer and a resin layer having a weaker adhesive strength than the adhesive layer, the entire surface of the gas barrier layer can be manually peeled from the synthetic resin substrate, A packaging container, wherein a half-cut reaching at least a synthetic resin base material of the lid material is provided on a heat-sealing portion of the lid material with respect to the container body.