Method for forming shaped plastic shells

Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Forming plural articles

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Details

264301, 264302, B29C 3302, B29C 3904, B29C 4118

Patent

active

048511773

ABSTRACT:
A method for heating a plurality of molds for casting heat fusable thermoplastic material each of the molds having casting surfaces and each of the molds having outer mold profiles which differ and wherein the molds are moveable into a mold chamber including the steps of providing a hot air distributor with different tube length profiles thereon; advancing a selected mold into the heating chamber and indexing the distributor to selectively match the outer profile of a selected mold with a selected tube length profile and directing hot air through the selected tube length profile for uniformly raising the temperature of the selected mold and casting heat fusable thermoplastic material in the heated mold to cause the heat fusable thermoplastic to adhere to the casting surface.

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patent: 3590435 (1971-07-01), Dunham
patent: 3680629 (1972-08-01), Gaudreau et al.
patent: 3728429 (1973-04-01), Colby et al.
patent: 4217325 (1980-08-01), Colby
patent: 4338068 (1982-07-01), Suh et al.
patent: 4389177 (1983-06-01), Colby
patent: 4621995 (1986-11-01), Wersosky
patent: 4623503 (1986-11-01), Anestis et al.
patent: 4683098 (1987-07-01), Belleville et al.

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