Injection molding valve member sealing bushing with a thin colla

Details Injection molding valve member sealing bushing with a thin colla Injection molding valve member sealing bushing with a thin colla

1994-03-07

1995-02-07

Heitbrink, Tim

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...

425566, B29C 4523

Patent

active

053870999

ABSTRACT:
Valve gated injection molding apparatus wherein the reciprocating valve member extends into the melt passage through a sealing bushing. The sealing bushing has a thin steel collar portion which extends forwardly into the melt passage and fits around the valve member to form a seal against leakage of melt rearwardly along the valve member. In the preferred embodiments, the collar portion is thin enough that it is slightly compressed around the valve member by the pressure of the surrounding melt in the melt passage to improve the seal.

REFERENCES:
patent: 4433969 (1984-02-01), Gellert
patent: 4521179 (1985-06-01), Gellert
patent: 4740151 (1988-04-01), Schmidt et al.
patent: 4919606 (1990-04-01), Gellert
patent: 5254305 (1993-10-01), Fernandez et al.

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