Injection molding machine having a freely rotatable screw

Details Injection molding machine having a freely rotatable screw Injection molding machine having a freely rotatable screw

2006-07-11

2006-07-11

Heitbrink, Tim (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

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

Feed control of material en route to shaping area

C264S040300

Reexamination Certificate

active

07074028

ABSTRACT:
By starting injection, resin pressure in front of the check valve is raised, and the check ring moves backward. Pressure of resin accumulated between flights of the screw prevents the check ring from moving backward, and the screw is kept freely rotatable to thereby make the backward speed of the check ring faster. Therefore, the check ring is brought into tight contact with the check seat quickly to close the resin path. Thereafter, the rotation of the screw is fixed, reduced pressure in the injection/dwell causes the screw to rotate in a normal direction, and prevents the resin from being pressed toward the front of the check valve.

REFERENCES:
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Patent Abstracts of Japan of JP 06071706, published Mar. 15, 1994.
Patent Abstracts of Japan of JP 07195461, published Aug. 1, 1995.
Patent Abstracts of Japan of JP 2001030316, published Feb. 6, 2001.

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