Internally heated torpedo with internal melt distribution chambe

Details Internally heated torpedo with internal melt distribution chambe Internally heated torpedo with internal melt distribution chambe

1990-08-22

1991-10-08

Heitbrink, Timothy

Plastic article or earthenware shaping or treating: apparatus

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

With means to heat or cool

26432815, 425568, 425570, 425573, B29C 4520

Patent

active

050550284

ABSTRACT:
An integral heated torpedo for use in injection molding has an internal melt distribution chamber which distributes heated melt through multiple melt flow paths onto the exterior surface of the torpedo. The torpedo is formed from a single piece of metal and has an elongate body portion which extends axially from an enlarged end portion and which terminates in tip. The center of the torpedo body portion contains an axial cavity extending between the torpedo tip and the enlarged end portion. The bore is adapted to receive a heating element which includes a coil of resistance wire and a thermocouple which are surrounded by heat insulative material. A plurality of melt flow passages extend axially through the enlarged end portion and are disposed generally around the torpedo bore to provide a series of melt flow paths through the enlarged end portion onto the heated exterior surface of the torpedo body.

REFERENCES:
patent: 4120086 (1978-10-01), Crandell
patent: 4161386 (1979-07-01), Osuna-Diaz
patent: 4304544 (1981-12-01), Crandell
patent: 4376244 (1983-03-01), Gellert
patent: 4433969 (1984-02-01), Gellert
patent: 4576567 (1986-03-01), Gellert
patent: 4577685 (1985-12-01), Gellert
patent: 4611394 (1986-09-01), Gellert
"Update on Runnerless Molding: New Hardware, New Suppliers", Plastics Technology, Apr. 1985, pp. 93-100.

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