Method of manufacturing plastic molding

Plastic and nonmetallic article shaping or treating: processes – Carbonizing to form article – Agglomeration or accretion

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Details

264 455, 264 51, 264 54, 264DIG64, 425812, 425817R, B29C 3512, B29C 6722, B29C 3310, B29B 1114

Patent

active

047203633

ABSTRACT:
A method of manufacturing a plastic molding of a foamable thermoplastic raw material blank or preform which contains a foaming agent by high frequency voltage heating in a molding die assembly defining a molding cavity, wherein gas discharging openings which extend through the thickness of the blank or preform are preformed in the raw material blank or preform.

REFERENCES:
patent: 4203815 (1980-05-01), Noda et al.
patent: 4434251 (1984-02-01), Sasajima et al.
patent: 4459249 (1984-07-01), Matsuda
patent: 4524037 (1985-06-01), Marc

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