Backflow preventer for an injection molding machine

Details Backflow preventer for an injection molding machine Backflow preventer for an injection molding machine

1983-01-19

1984-10-16

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

With separate and distinct upstream agitating or kneading means

Within pressurizing chamber

2643281, 366 79, 425562, 425563, 425564, B29F 103, B29F 302

Patent

active

044772424

ABSTRACT:
A backflow preventer at the end of an injection molding worm has a pressure ring which abuts directly upon the worm and serves a shank of the valvehead which also bottoms in a bore upon the worm so that force transmission to the worm is over its entire cross section. The shank is surrounded by a blocking ring which can shift in its axial stroke between a position in which it abuts the head and a position in which it abuts the pressure ring, the axial stroke being adjustable by shims forming the floor against which the shank abuts within the bore of the worm.

REFERENCES:
patent: 3319299 (1967-05-01), Kraly
patent: 3550208 (1970-12-01), Peters
"What Injection Molders Should Know About Reciprocating Screw-Tip Shutoffs," Plastics Technology Reprint.

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