Method and apparatus for manufacturing compression molded articl

Details Method and apparatus for manufacturing compression molded articl Method and apparatus for manufacturing compression molded articl

1989-02-13

1990-07-24

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

264325, 264335, 425125, 4253871, 425393, 425398, 425414, 425437, B29C 4302

Patent

active

049434055

ABSTRACT:
A method and apparatus for manufacturing compression molded articles from a thermoplastic material blank comprising heating the material, and compression molding the blank by means of a die. The material forming the blank is deposited on the surface of an intermediate support which forms a part of the compression molding mold and extends under and is separated from the die. The blank is separated from the die, which may be accomplished using a heated stream of gas surrounding the die and directed at the point of separation. The blank is introduced into the mold which is closed as the intermediate support is lowered, followed by compression molding the blank by the application of compression molding pressure, and cooling the molded article at least partly under pressure.

REFERENCES:
patent: 3313875 (1967-04-01), Magerle
patent: 3861846 (1975-01-01), Berry
patent: 3930770 (1976-01-01), Gaudet
patent: 4351629 (1982-09-01), Farrell
patent: 4492548 (1985-01-01), Hubert
patent: 4834641 (1989-05-01), Keyser

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