Method for producing foamed moldings from synthetic resin materi

Details Method for producing foamed moldings from synthetic resin materi Method for producing foamed moldings from synthetic resin materi

1977-07-08

1978-12-12

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 51, 264529, 264328, 264DIG14, 264DIG83, B29D 2700

Patent

active

041296354

ABSTRACT:
Foamable synthetic resin materials are plastified and injected into a mold cavity in an amount less than the volume of mold cavity and a body of gas under pressure is charged in the mold cavity in such manner that it is enclosed by said resin materials. When the injected resin materials sets at least at its outer surface layer, the gas is discharged out of the mold cavity so that the foamable resin materials can be expanded in the hollow portion formed by the pressure of the charged gas. Said foamable resin materials may be surrounded by unfoamable resin materials in the mold cavity.

REFERENCES:
patent: 3058161 (1962-10-01), Beyer
patent: 3211605 (1965-10-01), Spaak
patent: 3378612 (1968-04-01), Dietz
patent: 3558751 (1971-01-01), Santelli
patent: 3901958 (1975-08-01), Doll
patent: 4033710 (1977-07-01), Hanning

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