Minimum vestige nozzle assembly for plastics injection molding

Details Minimum vestige nozzle assembly for plastics injection molding Minimum vestige nozzle assembly for plastics injection molding

1996-08-21

1998-09-08

Heitbrink, Tim

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, B29C 4520

Patent

active

058042288

ABSTRACT:
A hot tip nozzle assembly for injection molding plastic components comprises a nozzle housing defining a hot runner passage and a nozzle tip section which is received in the hot runner passage. The nozzle tip section defines a hot runner tip passage in flow communication with the hot runner passage. The nozzle tip section slides freely within the hot runner passage during injection molding. A stop is provided on the nozzle tip section to limit downward movement relative to the cavity gate and automatically position the nozzle tip relative to the injection gate of the mold. In addition, axial thermal expansion of the nozzle housing is not imparted to the nozzle tip section. The nozzle tip section also has a restricted length that can axially thermally expand. Accordingly, the position of the nozzle tip is only minutely affected by even larger temperature changes in the nozzle assembly. This controlled thermal expansion together with the sliding movement of the nozzle tip section relative to the nozzle housing maintains the nozzle tip at a substantially constant position during the injection molding operation and minimizes vestige formation in the molded components.

REFERENCES:
patent: 3632248 (1972-01-01), Reinfeld
patent: 4588367 (1986-05-01), Schad
patent: 4902218 (1990-02-01), Leonard et al.
patent: 5098280 (1992-03-01), Trakas
patent: 5318434 (1994-06-01), Gellert
patent: 5501594 (1996-03-01), Glozer et al.
patent: 5513976 (1996-05-01), McGrevy
patent: 5609893 (1997-03-01), Eastwood
The Condensed Chemical Dictionary, p. 126, 1981.

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