Anti-drip injection nozzle for plastic molding

Details Anti-drip injection nozzle for plastic molding Anti-drip injection nozzle for plastic molding

1974-05-17

1976-01-27

Aegerter, Richard E.

Fluent material handling, with receiver or receiver coacting mea

Drip prevention by flow reversing and/or overfill removal

By means reversing direction of flow

141354, 164337, 251354, 425245, B65B 304, B65B 3902

Patent

active

039346269

ABSTRACT:
An axially compliant injection nozzle for plastic molding machines incorporating a valve actuated by differential motion between the mold and the conditioning chamber comprises a tappet engaged on the stem of that valve and entrapping a valve spring between the valve seat and the tappet. The nozzle has a sliding fit with a bore in the tappet head and is biased away from the latter by a secondary spring. The action of the secondary spring aids in maintaining good sealing contact between the nozzle and the sprue bushing and during the injection period despite variations in the lock-up force between the nozzle and the sprue, and retains such contact subsequent to injection so as to prevent plastic drip due to backflow.

REFERENCES:
patent: 2821750 (1958-02-01), Huelskamp
patent: 3416577 (1968-12-01), Franz

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