Process for thermoforming multilayer sheets

Details Process for thermoforming multilayer sheets Process for thermoforming multilayer sheets

1993-05-21

1995-01-10

Fiorilla, Christopher A.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

264512, 264549, 264550, B29C 5100

Patent

active

053804813

ABSTRACT:
A process for thermoforming a sheet, involving a static back-pressure which initially increases substantially continuously, then decreases substantially continuously, during the thermoforming operation. The back-pressure is preferably controlled by a pressure release valve.

REFERENCES:
patent: 4421712 (1983-12-01), Winstead
patent: 4990562 (1991-02-01), Chou et al.
patent: 5198175 (1993-03-01), Kato et al.
patent: 5283029 (1994-02-01), Ellemor

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