Sprue bar assembly for use in a stack mold

Details Sprue bar assembly for use in a stack mold Sprue bar assembly for use in a stack mold

1998-08-28

1999-10-19

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

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

With coupling between charger and mold

425588, B29C 4512

Patent

active

059685620

ABSTRACT:
A sprue bar assembly for a melt transfer system for stack molds comprises a sprue bar and a sprue bar sleeve, a sprue bar and drool restrictor and sleeve or a sprue bar and drool restrictor. For the assemblies with the sleeve, when the stack mold is opened, the sprue bar slides inside the sprue bar sleeve which captures any leakage therefrom. When the mold is closed, the sprue bar sweeps captured leakage out of the sleeve to an area outside the mold. As the busing at the end of the sprue bar can contact the nozzle of the injection machine at a point very close to the edge of the fixed platen, the resulting minimum length of the sprue bar is reduced, reducing pressure losses through the sprue bar and reducing the cost of the sprue bar. The sprue bar sleeve can be fabricated from an insulating material to enhance the thermal characteristics of the sprue bar assembly and a scraper can be provided on the sprue bar to improve removal of captured material from the sprue bar sleeve. If a drool restrictor is provided within the bushing, the amount of drool from the sprue bar when the bushing is not in engagement with the nozzle of the injection machine can also be reduced and, in some circumstances, can eliminate the need for the sleeve.

REFERENCES:
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patent: 4212626 (1980-07-01), Gellert
patent: 4611983 (1986-09-01), Bielfeldt
patent: 4867938 (1989-09-01), Schad et al.
patent: 5011646 (1991-04-01), Bertschi
patent: 5040969 (1991-08-01), von Buren et al.
patent: 5458843 (1995-10-01), Brown et al.
patent: 5518387 (1996-05-01), Di Simone
patent: 5522720 (1996-06-01), Schad

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