Thermally insulated heated sprue bushing in plastic molding appa

Details Thermally insulated heated sprue bushing in plastic molding appa Thermally insulated heated sprue bushing in plastic molding appa

1986-01-08

1987-05-19

Hoag, Willard E.

Plastic article or earthenware shaping or treating: apparatus

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

With means to heat or cool

219200, 219421, 219523, 425568, B29C 4527, B29C 4574

Patent

active

046663967

ABSTRACT:
This invention is to disclose an insulated heated sprue bushing in plastic molding apparatus, and comprises a plastic molded segment as a thermal barrier to insulate or break the heat flow between the sprue bushing shoulder and neck section of the stem of the sprue bushing, and a heater band placed on the head of the sprue bushing.

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patent: 4273525 (1981-01-01), Reitan
patent: 4279588 (1981-07-01), Gellert

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