Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means between charger and mold to cut off flow of...
Patent
1987-10-09
1988-11-01
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With means between charger and mold to cut off flow of...
264537, 2643289, 26432812, 425566, B29C 4520
Patent
active
047815728
ABSTRACT:
A self-regulating gate valve assembly, adapted for use in a plastic product injection molding apparatus having a mold cavity and a core therein for molding a hollow product of predetermined design, is characterized by a construction substantially eliminating core deflection during plastic molding compound flow in the injection molding apparatus and thus uneven wall thicknesses and weld lines in the hollow molded plastic product. The gate valve assembly includes a valve pin of unique construction for creating a sheath-like flow configuration of the plastic molding compound as it is injected into the mold cavity to produce balanced forces on the mold core to prevent deflection and for closing the gate in a self-regulating manner when the mold cavity is filled.
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Heitbrink Timothy W.
Sonoco Products & Company
Woo Jay H.
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