Biodegradable resin foam and method and apparatus for producing

Details Biodegradable resin foam and method and apparatus for producing Biodegradable resin foam and method and apparatus for producing

1994-07-12

1997-02-11

Seidleck, James J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

264 459, 264 461, 264 51, 264 53, 264 55, 521 88, 521 841, 521 99, 521102, 5211091, C08J 908, B29D 700

Patent

active

056021887

ABSTRACT:
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.degree. C. or more in melting point and a low-melting biodegradable resin ingredient of 100.degree. 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.

REFERENCES:
patent: 4479914 (1984-10-01), Baumrucker
patent: 5252271 (1993-10-01), Jeffs
patent: 5308879 (1994-05-01), Akamatu et al.
patent: 5360586 (1994-11-01), Wyatt et al.

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