Turbulent flow gate for the injection molding of tubular parts,

Details Turbulent flow gate for the injection molding of tubular parts, Turbulent flow gate for the injection molding of tubular parts,

1986-07-17

1987-12-08

Miles, Tim

Plastic article or earthenware shaping or treating: apparatus

With separate and distinct upstream agitating or kneading means

Within or at forming means

425207, 425533, B29C 3104

Patent

active

047116021

ABSTRACT:
Injection molding apparatus is disclosed in which weld lines are removed from a part, such as a parison, which weld lines are caused by the interruption or splitting of the flow of plastic material around core support pins or the like by the provision of an annular mixing chamber which opens into the plastic material flow passage. The plastic material is caused to move radially into the mixing chamber where it is spread by reason of the increasing volume encountered, accompanied by a reversal of flow radially inwardly into an annular injection gate. The movement of plastic material within the chamber and the resultant increase in temperature by reason of shear, eliminates the weld lines which have been formed in the material by reason of the splitting of flow around the pins.

REFERENCES:
patent: 3106746 (1963-10-01), Sunday
patent: 3266092 (1986-08-01), Corbett
patent: 3296662 (1967-01-01), Raley
patent: 3349155 (1967-10-01), Valyi
patent: 3859017 (1975-01-01), Meudec
patent: 4173446 (1979-11-01), Larson
patent: 4360494 (1982-11-01), Kurtz
patent: 4509907 (1985-04-01), Ratheiser
patent: 4584154 (1986-04-01), Cerny

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