Hot sprue assembly for an injection molding machine

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

1981-09-23

1983-11-01

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

425568, 425573, 425810, B29F 103

Patent

active

044128053

ABSTRACT:
A hot sprue assembly is provided for controlling flow of molten material into the mold cavity of an injection molding machine. The hot sprue assembly is particularly designed for use with an injection molding machine for molding centrally apertured record discs, such as video information discs. The hot sprue assembly includes a hot sprue bushing cooperating with a dispersion head to define an open and relatively narrow annular gate through which molten material is injected into the mold cavity, and a central die plug within the mold cavity for cooperating with the dispersion head to mold a central aperture into the disc. Valving of the molten material through the gate is achieved by heating the sprue assembly to create a temperature differential which, during solidification of the material within the mold cavity, permits the material within the mold cavity to solidify up to the gate without substantial solidification of material within the sprue assembly. The gate is disposed at a plane recessed slighty from the general plane of the solidified disc to prevent any surface discontinuities arising by retraction of the sprue assembly when the mold cavity is opened from projecting above the general plane of the disc.

REFERENCES:
patent: 4279588 (1981-07-01), Gellert
patent: 4290744 (1981-09-01), Dannels
patent: 4304544 (1981-12-01), Crandell
patent: 4340353 (1982-07-01), Mayer
patent: 4344750 (1982-08-01), Gellert
patent: 4345892 (1982-08-01), Schulte

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