JPH0684184B2 - Airtight container for food - Google Patents

Description

Description: [Industrial field of use] The present invention relates to a hermetically sealed container for food containing a food heated at the time of eating.

[Prior Art] In recent years, in group meals such as school meals, demand for ready-to-eat foods has increased due to demands for saving cooking labor, labor costs, and ensuring hygiene. This demand trend, including food products, is becoming more apparent.

For example, in school meals, a method in which raw fish or the like is vacuum-packed together with a sauce for seasoning in a packaging container made of a plastic film, frozen and stored, and then heated in a microwave oven or the like for cooking is becoming popular. .

Conventionally, cooked food stored in a closed container by a vacuum pack or the like, when cooking by heating with a microwave oven or the like at the time of eating, in order to prevent the packaging material from bursting due to a pressure increase in the closed container due to heating, It may be necessary to manually perforate each closed container.

[Problems to be Solved by the Invention] However, according to the above-mentioned sealed container for food, not only in the case of home cooking, but particularly in the case of performing a large amount of cooking such as a group lunch, it takes a lot of time and labor for drilling work. There is a problem of increased labor costs.

Therefore, the present invention is intended to provide a hermetically-sealed container for food that can eliminate the hole-drilling work during cooking by heating.

[Means for Solving the Problems] In order to solve the above problems, the present invention relates to a closed container for food containing food to be heated, in which a hole is provided in a container wall of the closed container and a container wall around the hole. A heat-shrinkable film is provided on the outer surface of the heat-shrinkable film so that the heat-shrinkable film is adhered and fixed to the heat-shrinkable film so that the heat-shrinkable film is airtightly covered.

[Operation] According to the above means, the inside of the container is surely kept airtight by a vacuum pack or the like during storage to protect the contents, and at the time of heating at the time of eating, the opening to be heated is automatically opened to form a closed container. The internal pressure does not rise.

EXAMPLES Examples of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of the food closed container of the first embodiment.

In the figure, reference numeral 1 denotes a container wall of a bag-shaped closed container containing pre-cooked food 2, which is made of polyester film or the like like a retort pouch, and a part thereof, for example, in a closed container which is placed at the time of heating. A heated opening 3 that is opened by heating is provided at or near the upper part.

The heated opening 3 has a diameter of 1 to 3 mm provided on the vessel wall 1.
Alternatively, a vinyl chloride system or the like which is adhered and fixed by an adhesive agent 5 so as to be peelable by shrinkage in order to hermetically cover the outer surface of the chamber wall 1 around the hole portions 4 and the periphery of the hole portions 4 and two or more circular hole portions 4. The heat-shrink film 6 of the above.

The hole 4 is not limited to a circular shape, and may have any other shape, or, as shown in FIGS. 2A and 2B, a negative shape or a cross shape that extends between the pores 7 of less than 1 mm provided in the vessel wall 1. Notch 8
It may be a or 8b.

The adhesive strength of the adhesive 5 is such that it covers the hole 4 airtightly during storage and does not prevent peeling from the container wall 1 when the heat-shrinkable film 6 shrinks due to heating.

The airtight container having the above configuration protects the food 2 by surely keeping the inside of the container airtight at the time of storage, and when the food 2 contained therein is eaten, if it is heated and cooked by a heating means such as a microwave oven, it is exposed to heat. The heat-shrinkable film 6 of the opening 3 is deformed in a wave shape due to heat shrinkage and is peeled off from the outer surface of the vessel wall 1,
While the hole 4 is exposed, the gas inside the closed container does not leak from the hole 4 and the internal pressure does not rise.

FIG. 3 is a cross-sectional view of a main part of the sealed food container according to the second embodiment. The sealed container according to this embodiment has a back surface of the heat-shrinkable film 6 in the heated opening 30 and is made of paper or heat-shrinkable material. Unlike the closed container of the first embodiment in that a backing material 9 such as a relatively small film is laminated by a laminating means or an adhesive material 10 having a higher adhesive strength than the adhesive agent 5, a heat-shrinkable film 6 at the time of heating. Is peeled off in a curl shape in a short time.

Since other configurations and effects are similar to those of the first embodiment, the same members are designated by the same reference numerals and the description thereof is omitted.

In each of the above embodiments, the case where the closed container is formed into a bag made of polyester film or the like has been described, but the present invention is not limited to this, and may be a box made of heat-resistant plastic, for example.

Concrete Example As shown in FIG. 3, a retort pouch containing 200 gr of red rice as a food 2 is provided with a hole 4 having a diameter of 1 mm on the upper part of the wall 1 thereof.
After perforating in a row, a non-stretched polypropylene film (CPP), which is the backing material 9, is adhered with a rubber adhesive to measure the length of 30 mm, width of 15 mm, and thickness of 50 μm polyvinyl chloride heat-shrinkable film (MB- Si Mitsubishi Resin Co., Ltd. 6 was adhered to the outer surface of the retort pouch with an acrylic adhesive 5 so as to cover the hole 4 airtightly.

Next, when the retort pouch containing 200 gr of red rice was placed in a household microwave oven (high-frequency output 500 W) and cooking was started, the retort pouch swelled into a pillow shape due to internal pressure in about 1 minute after starting heating, and after starting heating. In about 2 minutes, the heat-shrinkable film 6 shrinks in a curl shape and peels off from the outer surface of the vessel lid 1,
The hole 4 was opened, and the exhaust from the hole 4 lowered the internal pressure of the retort pouch.

The retort pouch maintained a pillow shape even after the internal pressure decreased. The heat-shrinkable film 6 that contracted in a curl shape was held in a state in which a part of the heat-shrinkable film 6 was stuck to the vessel wall 1 without being peeled off from the vessel wall 1 and falling onto the tray of the microwave oven.

Comparative example Instead of concrete heat shrinkable film, length 30mm, width 15m
m, white roll paper weighing 30 gr / m ² , respectively, wax, after sticking to the outer surface of the retort pouch so as to airtightly cover the hole with a hot melt adhesive, and then subjected to the same cooking as the specific example, None of the paper peeled from the retort pouch.

[Effects of the Invention] As described above, the present invention relates to a food hermetically-sealed container for containing heated food, wherein a hole provided on the container wall of the hermetically-sealed container and an outer surface of the container wall around the hole are made of a heat-shrinkable film. Since it is a sealed container for food, which is characterized by having a heated opening that is airtightly covered by adhesively fixing it so that it can be peeled off by shrinkage, the contents must be kept airtight during storage. It protects and when heated during eating, the heated opening automatically opens and the pressure inside the closed container does not rise, so there is no need to perform manual drilling work on the closed container as in the past. , Drilling work can be eliminated.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 is a sectional view of a closed container for food according to the first embodiment, and FIGS. 2a and 2b are plan views showing other embodiments of a hole, respectively. FIG. 3 is a sectional view of an essential part of the sealed food container according to the second embodiment. 1 ... Vessel wall, 2 ... Food, 3 ... Heated opening, 4 ... Hole, 6 ... Heat shrinkable film, 9 ... Lining material, 30 ... Heated opening

Claims (1)

[Claims] 1. A sealed container for food containing heated food, wherein a hole provided in a container wall of the sealed container and an outer surface of the container wall at the periphery of the hole are heat-shrinkable films and peelable by shrinkage. A heat-sealed container for food, characterized in that it is provided with a heated opening that is airtightly covered by being adhered and fixed to.