Method for the prevention of drooling from a plastic injection m

Details Method for the prevention of drooling from a plastic injection m Method for the prevention of drooling from a plastic injection m

1979-07-18

1981-11-10

Pavelko, Thomas P.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

26432811, 425558, 425568, 425569, B29F 103

Patent

active

042997917

ABSTRACT:
A method for the prevention of drooling from a plastic injection molding mold and injection nozzles. The method comprises the steps of varying a volume of a sprue in injection molding mold by movement of a plunger in a nozzle touch member inserted into the sprue, automatically returning the plunger previously moved by the nozzle touch force to its original position as the nozzle touch force decreases when the nozzle moves away after injection molding has been carried out, and increasing the sprue volume equal to an amount of movement thereof more than when injection is made to reduce the residual pressure to the extent that no drooling is introduced while maintaining said nozzle in contact with said nozzle receiver.

REFERENCES:
patent: 3339239 (1967-09-01), Peck
patent: 3934626 (1976-01-01), Hall

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