Method of injection molding a thermoplastic article having a cel

Details Method of injection molding a thermoplastic article having a cel Method of injection molding a thermoplastic article having a cel

1973-09-21

1976-06-01

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Recycling of reclaimed or purified process material

Of gaseous process material

264 455, 264328, 264329, 264DIG14, 264DIG83, 425244, 428322, 428409, B29D 2700, B29F 104

Patent

active

039609960

ABSTRACT:
A method of and apparatus for the molding of foamed thermoplastic bodies with integral skins wherein, for each mold operation after the first, a portion of previously foamed material produced by expansion in the mold cavity, is temporarily accumulated behind a body of unfoamed thermoplastic and the foamed and unfoamed material are then forced into the mold cavity and permitted to expand therein.

REFERENCES:
patent: 3218375 (1965-11-01), Hardwick
patent: 3268635 (1966-08-01), Kraus et al.
patent: 3694529 (1972-09-01), Josephsen et al.
patent: 3751534 (1973-08-01), Oxley
patent: 3773873 (1973-11-01), Spaak et al.

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