Injection molding apparatus

Details Injection molding apparatus Injection molding apparatus

1975-04-21

1978-01-17

Baldwin, Robert D.

Plastic article or earthenware shaping or treating: apparatus

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

With coupling between charger and mold

425549, 425DIG227, B29F 103

Patent

active

040690032

ABSTRACT:
A method and apparatus for the injection molding of plastics wherein the sprue bushing is provided with a plurality of grooves in its bore as contrasted with the conventional sprue bushings having smooth bores. The sprue formed is complementarily ribbed and these irregular surfaces speed cooling of the sprue and facilitate manual handling thereof.

REFERENCES:
patent: 235476 (1880-12-01), White
patent: 2511350 (1950-06-01), Kosobut
patent: 3822856 (1974-07-01), Gellert

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