Process for the production of a molding from a preform composed

Details Process for the production of a molding from a preform composed Process for the production of a molding from a preform composed

1988-03-09

1989-07-18

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

264523, 264544, 264570, 264571, 264292, 264319, 264320, B29C 5100, B29C 4302

Patent

active

048491535

ABSTRACT:
A process for the production of a molding from at least one preform, in which process the preform, which has been heated to 330.degree. to 400.degree. C., is pressed by means of a pressure difference which increases slowly during the shaping into or onto a rigid mold heated to about the same temperature, and is then cooled while the pressure difference is maintained and is released from the mold. During the shaping and cooling, the edges of the preform are secured in their original position. The process makes it possible to produce moldings which have a thin wall thickness and a good surface and which exhibit a residual shrinkage which is sufficiently small for most applications.

REFERENCES:
patent: 3891736 (1975-06-01), Voaden
patent: 3893882 (1975-07-01), Repenning
patent: 3957939 (1976-05-01), Voaden
patent: 4129618 (1978-12-01), Downer et al.
patent: 4165357 (1979-08-01), Vetter
patent: 4261473 (1981-04-01), Yamada et al.
patent: 4510300 (1985-04-01), Levy
Abstract of East German 232,669.

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