Method and apparatus for thermoforming thermoplastic foam articl

Details Method and apparatus for thermoforming thermoplastic foam articl Method and apparatus for thermoforming thermoplastic foam articl

1978-09-15

1980-12-16

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Starting material is nonhollow planar finite length preform...

264321, 425384, 425388, 425398, B29C 1703, B29D 2700

Patent

active

042397278

ABSTRACT:
A method and apparatus for thermoforming plastic foam articles comprising the sequential steps of (a) preheating the plastic foam, usually supplied in the form of a continuous sheet stock, (b) clamping, in a fixed position, that portion of the stock material which is to be thermoformed, (c) initially deforming the preheated foam stock with a portion of a male mold member to form a preform, (d) drawing a vacuum on the interior of the female mold member to assist in completion of the thermoforming operation, and (e) completing formation of the desired article by deformation of the preform between a male and female thermoforming device.

REFERENCES:
patent: 3260781 (1966-07-01), Lux et al.
patent: 3667889 (1972-06-01), Martelli
patent: 3789095 (1974-01-01), Winstead
patent: 3814784 (1974-06-01), Wolf
patent: 3825166 (1974-07-01), Padovani
patent: 3917770 (1975-11-01), Jackson
patent: 3933562 (1976-01-01), Cruckshank et al.
patent: 3978182 (1976-08-01), Luthra
patent: 4025275 (1977-05-01), Gournelle

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