Biodegradable molding

a technology biodegradable materials, which is applied in the field of expanded molded articles, can solve the problems of inability to bury the molded articles, damage to the incinerator of plastic molded articles, and the inability to use disposable molded articles as molded articles, so as to prevent a reduction of strength, improve physical strength, and be sufficiently water resistant

a technology biodegradable materials, which is applied in the field of expanded molded articles, can solve the problems of inability to bury the molded articles, damage to the incinerator of plastic molded articles, and the inability to use disposable molded articles as molded articles, so as to prevent a reduction of strength, improve physical strength, and be sufficiently water resistant

US20050202229A1Inactive Publication Date: 2005-09-15NISSEI CO LTD
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  • Biodegradable molding
  • Biodegradable molding
  • Biodegradable molding

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0357] First of all, 30.0 grams of starch as the main ingredient, 7.0 grams of coniferous virgin pulp as water-insoluble fiber (strength adjusting agent), 7.0 grams of calcium carbonate as strength adjusting agent, 0.2 gram of guar gum as stabilizer and strength adjusting agent, 55.8 grams of water were mixed to prepare 100 grams of dough molding material. In this example, only high-amylose starch (corn starch containing 60% of amylose) was used as starch.

[0358] Next, in the aforementioned method 1 of the simultaneous attaching method the above molding material as the molding material 14, the biaxially stretched modified polyester film (50 μm thick) as the coating film 12, and the metal mold 20a shown in FIGS. 5(a) and 5(b), were used to manufacture the bowl-shaped container 10a. As for the heating method, both external heating to heat the metal mold 20a by an electric heater and internal heating by high-frequency dielectric heating were used. Also, in the external heating and inte...

example 2

[0360] The bowl-shaped container 10a was manufactured in the same way as example 1 except that a mixture of 25 weight % of potato starch and 75 weight % of high-amylose starch (corn starch containing 60% of amylose) is used as starch instead of high-amylose starch.

[0361] Moisture absorption strength of the resultant bowl-shaped container 10a was assessed in the aforementioned method. The result is shown in table 1.

example 3

[0362] The bowl-shaped container 10a was manufactured in the same way as example 1 except that a mixture of 40 weight % of potato starch and 60 weight % of high-amylose starch (corn starch containing 60% of amylose) is used as starch instead of high-amylose starch.

[0363] Moisture absorption strength of the resultant bowl-shaped container 10a was assessed in the aforementioned method. The result is shown in table 1.

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Abstract

A bowl-shaped container (10a) which is as a biodegradable molded article adheres a coating film (12) mainly made of biodegradable plastic and having at least hydrophobicity to the surface of the main body (11a) of the container mainly made of starch. The main body (11a) is molded through steam expansion of a slurry or dough molding material containing high-amylose starch and water, or a slurry or dough molding material containing starch, polyvinyl alcohol and water. For these reasons, it is possible to accomplish sufficient strength and at least sufficient water resistance, to exert a very excellent biodegradability and further to provide a biodegradable molded article having excellent moisture absorption strength mainly made of starch even if the biodegradable molded article has a complicated shape.

Description

TECHNICAL FIELD [0001] The present invention relates to a biodegradable expanded molded article mainly derived from starch, and a biodegradable molded article including a coating film bonded on a surface thereof, and particularly to a biodegradable molded article that can suitably be used for disposable expanded molded articles that are disposed after the use as a food container, a molding buffer material, GES, a wrapping tray, etc. BACKGROUND ART [0002] Conventionally, a plastic molded article and a paper / pulp molded article are the mainstream of a disposable molded article that is disposed after the use. This is because in most cases, raw materials of the disposable molded article should be durable and strong and at the same time readily formable depending on usage of the molded article. [0003] However, the plastic molded article and the paper / pulp molded article both have difficulties to be used as the disposable molded article, as shown below. [0004] First, when incinerated, the...

Claims

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Application Information

Patent Timeline
15 Sep 2005
Publication
US20050202229A1
IPC
B29C43/18; B29C44/12; B65D65/46
CPC
B29C43/003; B29C43/184; B29C43/206; B29C43/361; B29C44/12; B29C44/3426; B65D65/466; B29K2003/00
Inventors
OZASA, AKIO; HASHIMOTO, AKIHISA