Method for molding expanded plastic material articles

Details Method for molding expanded plastic material articles Method for molding expanded plastic material articles

1978-04-11

1981-04-07

Hoag, W. E.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264120, 264126, 264294, 264310, 264321, B29D 2700, B29F 502

Patent

active

042605717

ABSTRACT:
According to the method of the invention an article of thermoplastic material is partially expanded and preformed in a heated mold. The preformed article is withdrawn from the heated mold to further expand at atmospheric pressure and is transferred still malleable into a cooled mold having the final size and configuration of the article.

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patent: 3984511 (1976-10-01), Lammers
patent: 4106884 (1978-08-01), Jegelka

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