JPH0632386A - Biodegradable foamed mold vessel and manufacture thereof - Google Patents

Abstract

PURPOSE:To obtain a biodegradable foamed mold vessel, excellent in strength, heat-insulation, water-resistance, by feeding a raw material composed of cereals, starch, vegetable protein, and fibrous powder into an enclosed mold and depressurized after heating and binding with each other to form a vessel. CONSTITUTION:At least one of raw materials selected from groups such as cereals like polished rice, unpolished rice, barley, japanese millet, millet, corn, beans, etc., or starch, vegetable protein, fibrous powder (like cellulose) pelletized materials of the powder and the grains is put into a sealed mold. When the mold is heated, since the pressure within the mold is increased, it is depressurized after this high pressure condition is kept for a certain interval to foam the raw material in the mold while they are granular or powder. And then molded vessels are formed by combining with each other. At this time, the strength of vessels against shocks can be enhanced by controlling the water content of the molded vessel to 3-30%, preferably 3-20%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foam-molded container made of grain, starch, vegetable protein, fiber or the like as a raw material and a method for producing the same.

[0002]

2. Description of the Related Art Corn cups, monaka containers, etc. are known as biodegradable containers obtained by mixing raw materials consisting of wheat flour and / or starch and water into a slurry and then firing the mixture. There is.

[0003]

However, the above-mentioned container has a weak structure and is liable to be cracked, so that the strength is not sufficient. Further, it is inferior in water resistance and cannot be used for foods having a high water content. I have a problem.

The object of the present invention is a biodegradable foam-molded container made of granular material such as grains and starch, having sufficient strength during use and storage, and having excellent heat insulation and water resistance. And its manufacturing method.

[0005]

The method for producing a biodegradable foam-molded container according to the present invention comprises a powdery material of grain, starch, vegetable protein, and fibrous material, a granulated material from the powdery material, and It is characterized in that at least one raw material selected from the group consisting of grain grains is put into a closed mold, heated, and then decompressed to bind to form a container.

The biodegradable foam-molded container of the present invention is a molded container obtained by the above manufacturing method.

[0007] Examples of the grain include white rice, brown rice, wheat, hie, fluff, corn, beans and the like. Examples of the vegetable protein include wheat extracted protein and the like, and examples of the fiber include cellulose and the like.

In the above manufacturing method, the pressure inside the mold is increased by heating the mold. At this time, further pressure may be applied. Then, the pressure is maintained for a certain period of time and then reduced. As a result, the raw material in the mold is foamed in the form of particles or powder and bound to each other to obtain a container-shaped molded product.

By pressing the once foamed molded product again in the mold, a foamed molded product that is more dense and has increased strength and an excellent appearance can be obtained.

Further, by arbitrarily changing the shape of the forming die, it is possible to obtain a forming container having an arbitrary shape such as a dish, a bowl or a cup.

By controlling the water content of the molded container to about 3 to 30%, preferably 3 to 20%, the strength of the container against impact can be increased. Water content is 3
If it is less than%, the obtained molded container becomes brittle, while
If it exceeds 30%, it becomes soft and the shape cannot be maintained.

The water content can be controlled by controlling the water content of the raw materials, controlling by molding conditions,
Control of the water content after molding can be mentioned.

As a control method according to molding conditions,
Examples include heating conditions such as temperature rising rate, pressure, holding time, depressurizing method, that is, control of depressurizing rate, and method of opening a molding die.

As an example of a method for controlling the water content after molding, the molded product is left in a constant humidity chamber for a fixed time. Alternatively, it is possible to spray water into the molding container.

At least one of sugars, oils and fats, emulsifiers, stabilizers, salts, water, and protein powders in addition to the above raw materials.
You may add one. By adding these, a binding property is improved and a molded container having a good surface condition can be obtained.

Examples of the emulsifier include monoglyceride and its derivatives, sugar ester, propylene glycol ester, polyglycerin fatty acid ester, sorbitan fatty acid ester and the like.

Examples of the above stabilizers include plant polysaccharides such as locust bean gum, seaweed extracts such as carrageenan, and thickeners of microbial origin.

Examples of the salts include phosphates.

If necessary, colorants, fragrances, etc. may be added to the above raw materials.

The foam-molded container of the present invention is a food container such as kushikatsu, frankfurt, chicken nugget, takoyaki, yakisoba, okonomiyaki, curry, hamburger, hot dog, soup, rotary grill, butaman, ramen, pizza, hot cake, and fried potato. It can be widely used as a general container.

Further, this container is decomposed by microorganisms, and when it is buried in soil, it is decomposed in about 2 to 10 weeks.

[0022]

Industrial Applicability As described above, the biodegradable foam-molded container of the present invention is a powdery material of cereals, starch, vegetable protein, and fibrous material, a granulated product of the powdery material, and a grain particle. At least one raw material selected from the above is placed in a closed mold, heated, depressurized and bound, and molded into a container shape.

Therefore, the container has sufficient strength during use and storage, and also has excellent heat insulation and water resistance. For example, in addition to general food containers, for example, food containers with high temperature and high water content. There is an effect that can be used as.

As described above, the method for producing a biodegradable foam-molded container of the present invention is, as described above, a powdery material of cereals, starch, vegetable protein, and fibrous material, a granulated material from the powdery material,
In addition, a raw material consisting of at least one selected from grain grains is put into a closed mold, heated, and then decompressed to bind to form a container.

Therefore, it is possible to obtain a foamed container by decompressing and binding, and as a result, it is possible to impart heat insulation and water resistance to the container. Further, by putting the molding container in the molding die again and pressurizing it, it is possible to obtain an effect that a container which is more dense and has improved strength and appearance can be obtained. In addition, the water content of the molding container is 3 to 30%.
By controlling so that the strength of the container can be further increased.

Further, by adding at least one of sugars, oils and fats, emulsifiers, stabilizers, salts, water and proteins to the raw material, the binding property can be improved and the surface condition of the molding container can be further improved. .

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location C08L 1/02 LAV 7415-4J 89/00 LSE 7415-4J

Claims (8)

[Claims] 1. A hermetically sealed mold is provided with a raw material comprising at least one selected from grains, starch, vegetable proteins, and fibrous powders, granules from the powders, and grains. A method for producing a biodegradable foam-molded container, which comprises heating, depressurizing, and binding to form a container. 2. The method for producing a biodegradable foam-molded container according to claim 1, wherein pressure is applied during the heating. 3. The method for producing a biodegradable foam-molded container according to claim 1, wherein the molded container is put into a molding die again and pressurized. 4. The water content of the molded container after molding is 3 to 30.
%, And the method for producing a biodegradable foam-molded container according to any one of claims 1 to 3. 5. The raw material contains at least one selected from the group consisting of sugars, fats and oils, emulsifiers, stabilizers, salts, water, and proteins.
5. The method for producing a biodegradable foam-molded container according to any one of items 4 to 4. 6. A hermetic molding die is charged with a raw material comprising at least one selected from grains, starch, vegetable proteins, and fibrous powders, granules from the powders, and grains. A biodegradable foam-molded container, characterized in that the container is formed into a container shape after heating, decompressing and binding. 7. The water content of the molded container after molding is 3 to 30.
%, The biodegradable foam-molded container according to claim 6. 8. The raw material contains at least one selected from the group consisting of sugars, fats and oils, emulsifiers, stabilizers, salts, water, and proteins.
Alternatively, the biodegradable foam-molded container according to item 7.