Mold for producing molded discs

Details Mold for producing molded discs Mold for producing molded discs

1992-05-13

1994-03-29

Bushey, Charles S.

Plastic article or earthenware shaping or treating: apparatus

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

With product ejector

264106, 425437, 425810, 425812, B29C 4500

Patent

active

052979512

ABSTRACT:
In a mold for producing a disc having a stationary mold half and a movable mold half, an air passageway is provided in the stationary mold half to feed air into a cavity between the mold halves approximate the center of the disc being molded. Further, two air passageways are provided in the movable mold half to feed air into the cavity between the mold halves. One of the air passageways in the movable mold half feeds air into the cavity proximate the center of the molded disc while the second air passageway feeds air into the cavity proximate the outer periphery of the disc on the side toward the stationary disc. The air fed from the second air passageway of the movable mold half flows around the outer periphery of the disc and behind the disc to assist in separating the disc from the movable mold half. Further, a vacuum passageway is provided in the movable mold half leading to the backside of a stamper, mounted to the face of the movable mold half, to prevent air from the second air passageway of the movable mold half from also flowing around the peripheral edge of the stamper and behind the stamper.

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Anon., Webster's New World Dictionary, World Pub. Co., Cleveland (1957) p. 907.

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