Method for thermoforming sheet articles

Details Method for thermoforming sheet articles Method for thermoforming sheet articles

1997-10-09

1999-07-27

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

264314, 156222, 425520, 425521, 425389, 425390, B29C 5114, B29C 5128, B29C 5142

Patent

active

059285974

ABSTRACT:
A method of thermoforming sheet articles includes: a) heating a sheet article to be thermoformed; b) inserting the heated sheet article into a pressure vessel having first and second vessel halves, wherein each vessel half includes a liquid chamber and a thin shell configured for forming the sheet article to a desired shape; c) closing the pressure vessels such that the sheet article is captured between the thin shells; and d) providing liquid of equal pressure in each liquid chamber to force the thin shells together to form the sheet article to the desired shape and to draw heat away from the thin shells for cooling the sheet article.

REFERENCES:
patent: 1311342 (1919-07-01), Gloetzner
patent: 2978008 (1961-04-01), Conti
patent: 3580795 (1971-05-01), Eichenlaub
patent: 3964958 (1976-06-01), Johnston
patent: 4267142 (1981-05-01), Lankheet
patent: 5217563 (1993-06-01), Niebling et al.
patent: 5378134 (1995-01-01), Blot et al.
patent: 5425627 (1995-06-01), Reil et al.
patent: 5427599 (1995-06-01), Greschner et al.
patent: 5462786 (1995-10-01), Van Ert
International Search Report for PCT/US98/19991.

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