Injection molding nozzle probe and stack molding apparatus

Details Injection molding nozzle probe and stack molding apparatus Injection molding nozzle probe and stack molding apparatus

1984-06-11

1986-05-06

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Temperature control

26432815, 425378R, 425379R, 425549, 425570, 425572, B29C 4522

Patent

active

045868875

ABSTRACT:
This invention relates to an improved heated nozzle probe for injection molding and an improved stack molding system in which it is used. Each nozzle probe has an inner helical shaped heating element which extends into the pointed tip, and a separate outer one which does not. In addition to providing more heat to the pointed tip, this has the advantage that a standard unit can be used for various applications. In the stack molding system, two heated nozzles are arranged in alignment to bridge the parting line and the pointed tip of only the downstream one is heated. Combined with tapering the aligned gates to gradually increase in diameter in a downstream direction, this has been found to considerably reduce stringing and drooling problems as the mold opens for ejection.

REFERENCES:
patent: 3141915 (1964-07-01), Nieuwenhuis et al.
patent: 3674407 (1972-07-01), Neuhaus
patent: 3800027 (1974-03-01), Tsutsumi
patent: 3970821 (1976-07-01), Crandell
patent: 4161386 (1979-07-01), Osuna-Diaz
patent: 4212626 (1980-07-01), Gellert
patent: 4230934 (1980-10-01), ter Beek et al.
patent: 4376244 (1983-03-01), Gellert
patent: 4433969 (1984-02-01), Gellert
patent: 4516927 (1985-05-01), Yoshida
patent: 4517453 (1985-05-01), Tsutsumi

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