B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
18/99
B29D 17/00 (2006.01) B29C 45/26 (2006.01) B29C 45/28 (2006.01)
Patent
CA 1168408
HOT SPRUE VALVE ASSEMBLY FOR AN INJECTION MOLDING MACHINE ABSTRACT OF THE DISCLOSURE 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 direc- tion 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.
389116
Discovision Associates
Gowling Lafleur Henderson Llp
LandOfFree
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