Mold for molding discs

Details Mold for molding discs Mold for molding discs

1995-10-30

1997-05-06

Davis, Robert

Plastic article or earthenware shaping or treating: apparatus

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

With product ejector

264106, 425437, 425810, B29C 4543

Patent

active

056268904

ABSTRACT:
In a mold for molding data discs having a stationary cylindrical member and a movable cylindrical member fixed to a stationary moldhalf and movable moldhalf respectively, in each of which a stationary mirror plate and a movable mirror plate are fixed, an outer peripheral ring is set on the outer peripheral surface of the movable mirror plate, having a protrusion in the lower portion of a small inner peripheral surface of the outer peripheral ring for preventing leakage of air blowing into a cavity to release the discs from the stamper.

REFERENCES:
patent: 5092758 (1992-03-01), Tanaka et al.
patent: 5092759 (1992-03-01), Lichtinger et al.
patent: 5180595 (1993-01-01), Kinoshita
patent: 5297951 (1994-03-01), Asai
patent: 5330693 (1994-07-01), Takada

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