Compression molding process

Details Compression molding process Compression molding process

1996-03-05

1998-06-09

Woo, Jay H.

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

264296, 2642975, 264323, 425393, 425400, 425414, B29C 4354

Patent

active

057628548

ABSTRACT:
A compression molding process for forming an article, preferably a preform or closure, is provided. The process includes the steps of forming thermoplastic resin into a precursor, wherein the precursor fits in a compression mold and has a shape for allowing the precursor to be supported in a predetermined or dimensionally preheld manner in a cavity of the compression mold prior to being compressed into a final shape, which shape is the shape of the compression mold; heating the precursor; and compression molding the precursor into the article while said precursor is heated. The step of forming may include the steps of extruding the resin into sheets; cutting discs from the sheets; and stacking the discs to form the precursors.

REFERENCES:
patent: 2403042 (1946-08-01), Bogoslowsky
patent: 4137031 (1979-01-01), Dickson et al.
patent: 4404159 (1983-09-01), McFarlane
patent: 4529372 (1985-07-01), Saumsiegle
patent: 4725219 (1988-02-01), Jakobsen et al.
patent: 4943405 (1990-07-01), Keller et al.
patent: 5571540 (1996-11-01), Weyenberg et al.

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