Valve-gate bushing for gas-assisted injection molding

Details Valve-gate bushing for gas-assisted injection molding Valve-gate bushing for gas-assisted injection molding

1996-06-28

1998-12-01

Ryan, Patrick

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

2643288, 264572, 425546, 425566, 425573, B29C 4523

Patent

active

058434852

ABSTRACT:
Mold bushings or nozzles for gas-assisted injection molding processes are disclosed. The devices include movable shut-off mechanisms which selectively facilitate or prevent the passage of molten plastic material into mold cavities. One or more apertures, such as holes, openings, channels, slits, slots, and the like, are provided at or adjacent the end of the pin members or at the end of the devices. The apertures are thin or small and have dimensions which will allow the passage of gas and at the same time prevent the plastic material from plugging or clogging them.

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