Injection foam molding process

Details Injection foam molding process Injection foam molding process

1977-12-14

1979-01-09

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264328, 264DIG5, 264DIG83, 425817R, 521146, B29D 2700

Patent

active

041338588

ABSTRACT:
This invention relates to an improved injection foam molding method in which a foamable mixture of molten synthetic polymer resin and a chemical blowing agent in unfoamed condition is injected into a gas-pressurized expandable mold having a mold section movable for expanding the mold cavity to a position in which the surface of that section is in registry to the surface of another mold section, in which process the mold is filled under conditions resisting foaming of the material prior to filling of the mold and a novel controlled time sequence effective to form a fine mold crease line is employed in releasing the gas pressure and expanding the mold to allow foaming of the mixture into conformity with the mold surface.

REFERENCES:
patent: 3268635 (1966-08-01), Kraus et al.
patent: 3694529 (1972-09-01), Josephsen et al.
patent: 3960996 (1976-06-01), Tonchev et al.
patent: 3966372 (1976-06-01), Yasulke et al.

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