Hot-runner tool for supplying molten plastic to an injection mol

Details Hot-runner tool for supplying molten plastic to an injection mol Hot-runner tool for supplying molten plastic to an injection mol

1984-09-24

1986-09-02

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

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

With means to heat or cool

264269, 2643288, 26432814, 425548, 425549, B29C 3302, B29C 3338

Patent

active

046093419

ABSTRACT:
A hot-runner tool with at least one hot-runner section for supplying molten plastic to an injection mold, preferably a multiple injection mold with a pin-point gate for each casting. The hot-runner section has an outer housing with a flow channel, at least one inlet, and at least one outlet and a heat conductor that can be connected to an electric voltage and that the molten plastic flows around. The flow channel in the hot-runner section is demarcated externally by at least one metal tube that is separated from the heat conductor and a layer of heat insulation is positioned between the metal tube and the inner surface of the outer housing. The metal tube can store and conduct a lot of heat and helps to heat up the plastic rapidly. Since the tube supplies additional heat to those points along the hot-runner section where the plastic needs more heat than at other points, the tube homogenizes the molten plastic along the total length of the hot-runner section.

REFERENCES:
patent: 4340156 (1982-07-01), Muller
patent: 4501549 (1985-02-01), Abramov et al.
patent: 4505661 (1985-03-01), Bielfeldt

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