초록 ▼

Foam forming techniques capable of permitting foaming of biodegradable resin to be positively and uniformly accomplished to provide a biodegradable resin foam with satisfactory quality. The biodegradable resin foam is made of biodegradable resin consisting of a main biodegradable resin ingredient of

Foam forming techniques capable of permitting foaming of biodegradable resin to be positively and uniformly accomplished to provide a biodegradable resin foam with satisfactory quality. The biodegradable resin foam is made of biodegradable resin consisting of a main biodegradable resin ingredient of 100°C. or more in melting point and a low-melting biodegradable resin ingredient of 100°C. or less in melting point. The biodegradable resin foam is produced by placing a starting material consisting of at least biodegradable resin and a substantial amount of moisture in a heated and pressurized environment, releasing the starting material from the environment to foam the biodegradable resin, and subjecting the foamed resin to forming by means of a forming mold. An apparatus for producing the foamed biodegradable resin foam includes a pressure adjusting chamber, an air-permeable forming mold, a pressure reducing tank and an injection machine.

대표청구항 ▼

A method for producing a biodegradable resin foam comprising the steps of: arranging an air-permeable forming mold in front of a cylinder formed at a front portion thereof with a narrowed opening charging a biodegradable resin starting material containing biodegradable resin and moisture in the cyli

A method for producing a biodegradable resin foam comprising the steps of: arranging an air-permeable forming mold in front of a cylinder formed at a front portion thereof with a narrowed opening charging a biodegradable resin starting material containing biodegradable resin and moisture in the cylinder; raising a temperature of the biodegradable resin to fluidize the biodegradable resin while forcibly transferring the biodegradable resin starting material toward the narrowed opening in the cylinder; extruding the fluidized biodegradable resin from the cylinder into the air-permeable forming mold to rapidly release the biodegradable resin from a heated and pressurized environment in the cylinder to foam the biodegradable resin by an expansion force caused by vaporization of the moisture resulting from rapidly releasing fluidized biodegradable resin which is in a heated and pressurized environment and in which the moisture is trapped; and forming the foamed biodegradable resin into a shape depending on a configuration of the forming mold.