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

1981-09-23

1983-07-05

Pavelko, Thomas P.

Plastic article or earthenware shaping or treating: apparatus

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

With means to heat or cool

425549, 425563, 425564, 425568, 425573, 425810, B29D 1700

Patent

active

043915795

ABSTRACT:
A hot sprue valve assembly is provided for controlling flow of molten material into the mold cavity 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. The valve assembly comprises a stationary valve body supporting a movable valve member for sliding motion toward and away from the mold cavity. The valve member includes a hot sprue bushing defining a heated flow path for passage of molten material toward the mold cavity, and a dispersion head carried by the bushing for directing the molten material to flow in a generally radially outward direction through gate passages with substantially uniform radial distribution into the mold cavity. In one position, the valve member is advanced into the mold cavity to align the gate passages with the mold cavity and thereby permit flow of the molten material into the mold cavity. The valve member is movable to retract the gate passages from alignment with the mold cavity to prevent flow of the molten material into the mold cavity. In this retracted position, a portion of the dispersion head remains within a central portion of the mold cavity to mold a central aperture into the disc prior to solidification of the molten material.

REFERENCES:
patent: 4260360 (1981-04-01), Holmes
patent: 4290744 (1981-09-01), Dannels

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