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
1976-06-23
1978-02-28
Lazarus, Richard B.
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...
425563, B29F 104
Patent
active
040764850
ABSTRACT:
An improvement is provided for plastic molding machinery of the type comprising a plastic melt injection apparatus and a mold. A shut-off valve which provides communication between the injection apparatus and the mold, includes a single elongate passageway and an elongate shut-off piston oriented generally parallel to the flow path and mounted in the passageway by a housing, which housing is supported by a single, streamlined leg so that the plastic melt flows therethrough in a single, undivided flow path. The melt flow path, as defined by the passageway and housing mounted therein has a generally circular transverse cross-section at an upstream station and a generally U-shaped transverse cross-section at a station downstream of the circular station. An aspect of the improvement is a plug-shaped tip formed integrally on the downstream end of the piston for expelling residue and cleaning the outlet port especially in structural foam molding applications. A further aspect of the improvement is an elongate nozzle for molding applications with larger molder sizes that require an extra long injection reach.
REFERENCES:
patent: 3037245 (1962-06-01), Darnell
patent: 3741704 (1973-06-01), Beasley
patent: 3849048 (1974-11-01), Bielfeldt
Beloit Corporation
Lazarus Richard B.
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