Metal mold and stamper for injection molding of a plastic disc f

Details Metal mold and stamper for injection molding of a plastic disc f Metal mold and stamper for injection molding of a plastic disc f

1984-08-21

1986-12-09

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With shrinkage compensation means

264106, 425810, B29C 4537

Patent

active

046278095

ABSTRACT:
A metal mold to be used for injection-molding of a flat plastic disc. The flat, annular mold cavity has a substantially continuously increasing axial thickness away from the injection gate. The gate can be in the center or on the outer periphery of the mold. A split mold type is disclosed wherein at least one of the inner opposed surfaces tapers away from an imaginary flat center plane. Alternatively, a stamper having a tapering thickness can be used in a mold having parallel opposed inner surfaces.

REFERENCES:
patent: 1665759 (1928-04-01), Vasselli
patent: 2616125 (1952-11-01), Colombo
patent: 4085178 (1978-04-01), McNeely et al.
patent: 4185955 (1980-01-01), Holmes et al.

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