Gas assisted injection molding apparatus

Details Gas assisted injection molding apparatus Gas assisted injection molding apparatus

1990-06-08

1991-09-03

Chiesa, Richard L.

Plastic article or earthenware shaping or treating: apparatus

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

425555, B29C 4517

Patent

active

050449249

ABSTRACT:
A gas assisted injection molding apparatus of the type in which a supply of resin is introduced into a cavity in a mold at a resin injection location and a gas injection assembly is provided to introduce gas into the mold cavity at a gas injection location removed from the resin injection location to assist the resin in filling out the mold cavity. The gas injection assembly includes a bore in the mold communicating with the mold cavity, a pin having a size to fit slidably in the bore and including a central axial passage for delivery of gas into the mold cavity through the pin, a power cylinder assembly mounting the pin for movement between an advanced gas injection position in which the pin is positioned in the bore with its forward tip in communication with the mold cavity and a retracted position in which the mold cavity is vented through the bore, and an annular edge on the pin operative to remove obstructions with each forward movement of the pin from its retracted position to its advanced position.

REFERENCES:
patent: 3621529 (1971-11-01), Kovacs
patent: 3873661 (1975-03-01), Kontz
patent: 4106887 (1978-08-01), Yasuike et al.
patent: 4474717 (1984-10-01), Hendry
patent: 4740150 (1988-04-01), Sayer
patent: 4824732 (1989-04-01), Hendry et al

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