Injection-compression process for forming complex shaped items o

Details Injection-compression process for forming complex shaped items o Injection-compression process for forming complex shaped items o

1994-07-05

1995-12-26

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

264320, 2643282, 2643287, B29C 4314, B29C 4318

Patent

active

054785197

ABSTRACT:
An injection-compression process for forming curable items of elastomeric material, the process including: an injection stage wherein a bottom half mold is injected by a nozzle with a quantity of fluid elastomeric material of a volume, at injection pressure, greater than that of the impression, the material in excess of the volume of the impression being collected outside the impression, in a recess at the injection nozzle and communicating with the impression; and a molding stage wherein the injection nozzle is replaced in fluidtight manner by an element of the same shape, but without the recess, for compressing the excess material into the impression until it sets.

REFERENCES:
patent: 3341647 (1976-04-01), Aberle
patent: 3950119 (1967-09-01), Reichenbach
patent: 4006210 (1977-02-01), Denton
patent: 4219322 (1980-08-01), Chang et al.
patent: 4321225 (1982-03-01), Jelinek
patent: 4618466 (1986-10-01), McGlashen et al.

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