Hot sprue valve assembly for an injection molding machine

Details Hot sprue valve assembly for an injection molding machine Hot sprue valve assembly for an injection molding machine

1980-10-31

1983-02-08

Pavelko, Thomas P.

Plastic article or earthenware shaping or treating: apparatus

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

With product ejector

264106, 264155, 264161, 264163, 2643289, 425562, 425568, 425574, B29D 1700

Patent

active

043727417

ABSTRACT:
A hot sprue valve assembly is provided for controlling flow of molten material through a hot sprue bushing of an injection molding machine. The valve assembly is particularly designed for use with an injection molding machine for molding centrally apertured record discs, such as video information discs, and the valve assembly includes means for forming the central aperture in the disc. In one embodiment, the aperture-forming means comprises a sleeve valve for molding the aperture in the disc prior to solidification of the disc-forming melt, whereas in another embodiment the aperture-forming means comprises a punch for punching the aperture subsequent to solidification of the disc-forming melt.

REFERENCES:
patent: 2613395 (1952-10-01), Massler
patent: 2992455 (1961-07-01), Salzman
patent: 3937779 (1976-02-01), Simmons
patent: 4085178 (1978-04-01), McNeely
patent: 4260360 (1981-04-01), Holmes

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