Sealing and retaining bushing for injection molding

Details Sealing and retaining bushing for injection molding Sealing and retaining bushing for injection molding

1986-10-20

1988-04-26

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

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

With means to heat or cool

2643288, 26432815, 425562, 425564, 425566, 425570, 425571, 425572, B29C 4520

Patent

active

047401516

ABSTRACT:
This invention relates to sealing and support bushings which are located between the manifold and the mold back plate to encircle each valve pin in a multi-cavity valve gated injection molding system. Each bushing is bolted through the manifold to a respective heated nozzle with central bores in alignment to receive the valve pin therethrough. The bushing has an outer flanged portion which extends to contact the mold back plate and forms a leakage containment chamber between them. Thus, the bushings retain the manifold in place, seal against substantial melt leakage around the reciprocating valve pins and collect any melt which does escape to prevent it entering the insulative air space between the hot manifold and the cooled mold back plate. Location of the bushing between the manifold and the mold back plate also enables the use of a standard manifold having longitudinal and transverse bores without requiring diagonal bores.

REFERENCES:
patent: 4026518 (1977-05-01), Gellert
patent: 4213751 (1980-07-01), Fernandez
patent: 4433969 (1984-02-01), Gellert
patent: 4446360 (1984-05-01), Gellert
patent: 4530654 (1985-07-01), Rose
patent: 4588367 (1986-05-01), Schad
patent: 4609138 (1986-09-01), Harrison
patent: 4657496 (1987-04-01), Ozeki et al.
patent: 4663811 (1987-05-01), Gellert
Husky Hot Runner Systems Catalogue C3.0.

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