Injection molding nozzle with thermocouple tube

Details Injection molding nozzle with thermocouple tube Injection molding nozzle with thermocouple tube

1993-03-02

1994-05-17

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With means to heat or cool

26432815, 425570, B29C 4520

Patent

active

053122429

ABSTRACT:
A heated injection molding nozzle having a cylindrical locating flange extending forwardly from a rear collar portion to mount the nozzle in a well in a cooled mold. The nozzle has a cylindrical central portion with an insulative air space extending between it and the surrounding cooled mold. A hollow thermocouple tube extends through the rear collar portion and along the inner surface of the locating flange to removably receive a thermocouple element which extends from the rear end of the nozzle and through the insulative air space to monitor the operating temperature near the forward end of the nozzle. In the event of pressurized melt escaping to fill the air space, contact of the thermocouple tube with the locating flange cools the melt which flows into the thermocouple tube sufficiently to freeze it and prevent leakage out amongst the wiring in other parts of the mold.

REFERENCES:
patent: 4583284 (1986-04-01), Gellert
patent: 4586887 (1986-05-01), Gellert
patent: 4705473 (1987-11-01), Schmidt
patent: 4768283 (1988-09-01), Gellert

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