Process for forming thermoplastic parts especially large structu

Details Process for forming thermoplastic parts especially large structu Process for forming thermoplastic parts especially large structu

1987-08-06

1989-09-05

Terapane, John F.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Differential temperature conditioning

264544, 264522, 264535, 264322, 264327, 425547, B29C 3502

Patent

active

H00006718

ABSTRACT:
Thermoplastic parts are formed by a process that produces at least one surface that is a direct replication of the mold surface without secondary operations, e.g., a "Class A" surface. The process is particularly suitable for the production of large parts such as automobile panels, refrigerator panels and the like especially those employing a high-viscosity resin and particularly those parts made by blow-molding. The process comprises pressing at a selected pressure a plastic preform heated above the glass transition temperature (Tg) against a suitably smooth or detailed mold surface held at a temperature below the Tg of the resin; raising, preferably rapidly, the mold to a temperature above Tg for the time necessary to raise above Tg a depth of resin sufficient to remove surface imperfections, die lines, and pores, and fill voids, and substantially embed included matter; and rapidly cooling the mold until the molded part is below Tg when pressure may be released and the mold opened.

REFERENCES:
patent: 3655848 (1972-04-01), Young et al.
patent: 3880973 (1975-04-01), Yoshikawa et al.
patent: 4512948 (1985-04-01), Jabarin

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