JPH02166071A - Heat retaining food container - Google Patents

Abstract

PURPOSE:To maintain food at high temperatures and prevent the generation of condensate by providing a food container made by forming a water absorbing layer on a substrate and containing a heating material. CONSTITUTION:A water-absorbing layer 1 is formed by laying a water-absorbing material over a container substrate layer 1 of polystyrene, foaming polystyrol, etc. With this water-absorbing layer inside, it is shaped into a food container in the form of a tray, box and tube and a heating material 7 is placed in a part of this container. Since this heat retaining food container can hold in the water-absorbing material the water to which condenses the vapor given off by the food during heating and since this water will not pass into the food, the food is retained in just made condition. A natural fiber or synthetic fiber such as nonwoven rayon is preferable for use as the water-absorbing material and an appropriately mixed product of iron powder vermiculite, activated carbon, salts and water is used as the heating material.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a heat-retaining container for food.

The present invention relates to various heat-retaining foods, especially foods that are preferably eaten warm in winter, such as bento boxes.

Concerning packaging containers that are suitable for keeping warm foods that are easy to cool and partially soften due to the generation of steam, such as freshly baked bread, freshly baked baked goods, and freshly steamed meat. It is.

Accordingly, the present invention is useful for the food packaging industry;

It is widely used in the food industry.

(Prior Art and Problems) Conventionally 5. In the cold season, it is common practice to put a heat generating material in a container, put a lunch box in it, cover it and carry it around to keep it warm until it's cold.

However, the temperature of the heat generating material stored inside is 70 to 90℃.
Because the bento box is heated up, a considerable amount of steam is generated from inside the bento box, and this steam gets trapped inside the container, causing a large amount of moisture to form on the surface of the cooked rice, etc.

The condensation causes the rice to become soggy and less than delicious.

(Means for Solving the Problems) The present invention maintains bento boxes, freshly baked bread, freshly baked baked goods, freshly steamed meat, freshly steamed shumai, etc. at high temperatures. To provide a heat-retaining container for food that does not generate condensed moisture.

The present invention is made by bonding a water-absorbing material onto a packaging container base material such as polystyrene or styrofoam, and then storing a heat generating material in a part of the food container, which is formed into a tray, a box, a cylinder, etc. This invention relates to a heat-retaining container for food.

In the present invention, since the food container is formed with the water-absorbing material bonded to the packaging container base material inside, the steam generated from the food during heating and keeping warm is condensed in the water-absorbing material and retained as moisture. be able to. Since the moisture retained in the water-absorbing material does not transfer to the food, the food is kept warm and freshly prepared.

Furthermore, depending on the type of heat-generating material, some heat-generating materials generate more moisture when generating one heat, but this moisture is also absorbed by the water-absorbing material and can prevent moisture from leaking outside the container.

In the present invention, the packaging container base material is polystyrene,
Styrofoam etc. are used.

A water absorbing material is bonded onto the packaging container base material.

In order to form a layer of water-absorbing material, a method of adhering only the water-absorbing material in powder form or a thin layer, or a method of adhering the water-absorbing material to each other is used.

In order to bond the water-absorbing material onto the packaging container base material, bonding using an adhesive is preferable.

The water-absorbing material is preferably a nonwoven fabric made of natural fibers or synthetic fibers, such as a nonwoven fabric made of rayon.

The packaging container base material, which is made of rayon non-woven fabric bonded with adhesive, is passed through a tunnel that can be heated to 70 to 150°C and then hot-molded so that the water-absorbing material is on the inside to form a box-shaped or cylindrical container. .

Further, in the present invention, a nonwoven fabric of rayon may be bonded to the inside of a food container such as a bento box that has been heat-molded from expanded styrene in advance using a hot-melt adhesive.

In the present invention, a heat generating material is housed in a part of the molded food container.

Heat generating materials include iron powder vermiculite, activated carbon, salts,
It is preferable to mix water appropriately, and the exothermic material is configured to generate heat to 80-110° C. in the presence of oxygen and maintain that temperature for 5 to 8 hours.

The heat generating material can be stored along the side wall, but it is better to store it flat at the bottom.

A heat-generating material is stored at the bottom, and a plate or tray-like material made of aluminum or plastic plate with good thermal conductivity is placed on top of it, and the bento is placed on top of it.

Freshly steamed shumai etc. are served.

It is a good idea to make appropriate holes in the aluminum plate etc. so that condensed water can fall.

Further, it is necessary to appropriately open air holes at the bottom of the food container for supplying oxygen to the heat generating material.

A food container containing a heat-generating material and a lid is packaged and sealed as a whole with oxygen-impermeable wrapping paper to block oxygen from reaching the heat-generating material, and the product is made into a product.

Next, examples of the present invention will be shown.

Embodiment 1 FIG. 1 is a longitudinal sectional view of a food container for keeping freshly steamed shumai wrapped in a paper bag warm.

1 is a foamed polystyrene layer, 2 is a water absorption layer made of nonwoven rayon fabric provided inside the layer, and 3 is an aluminum tray. 4 is freshly made shumai.

Reference numeral 5.5' indicates an appropriate number of air passage holes provided in a circular shape at the bottom of the container. Reference numerals 6 and 6' denote dew condensation water drop holes drilled in the tray, and an appropriate number of holes are provided in a circular shape.

7 is a heat-generating material, and when the oxygen-impermeable wrapping paper (not shown) is torn, fresh air is supplied with oxygen and starts generating heat. Depending on the amount of heat generating material, 5 to 10 hours, 80
It can be adjusted so that -110°C can be maintained.

8 is the wrapping paper that wrapped the freshly made shumai 4.

If the shumai is left packaged in the food container of the present invention, the product temperature can be maintained at around 50°C for about 7 hours, and all the water that evaporates due to heating is absorbed by the water absorbing material 2, so the shumai It won't get wet and soggy.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a heat-retaining food container of the present invention containing freshly made shumai. 1... Styrofoam layer 2... Water absorbing material layer 3...
Tray 4...Shumai's agent Patent attorney 1) Parent Male chart procedure amendment document March 28, 1999

Claims (1)

[Claims] (1) Food products made by storing a heat-generating material in a part of a food container made by bonding a water-absorbing material onto a packaging container base material such as polystyrene or styrofoam, and then molding it into a tray, box, or cylinder shape. Heat-retaining container.