Method and apparatus for reverse gated compression molding of th

Details Method and apparatus for reverse gated compression molding of th Method and apparatus for reverse gated compression molding of th

1994-12-07

1996-01-02

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

264320, 425555, 425420, 425812, B29C 4336, B29C 4534, B29C 4556

Patent

active

054806062

ABSTRACT:
Reverse gating is added to a conventional compression molding machine so that when the molding cavity is filled with material in excess of the amount required to mold a part, the material flows from the cavity to a pressure chamber to be vented. Pressure in the chamber allows back flow of the material from the chamber to the molding cavity during cooling to compensate for shrinkage.

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patent: 5256350 (1993-10-01), Franzini et al.
patent: 5281376 (1994-01-01), Hara et al.

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