Injection molding nozzle having tapered heating element adjacent

Details Injection molding nozzle having tapered heating element adjacent Injection molding nozzle having tapered heating element adjacent

1990-12-31

1991-09-10

Heitbrink, Timothy

Plastic article or earthenware shaping or treating: apparatus

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

With means to heat or cool

219523, 26432815, 425568, 425570, B29C 4522

Patent

active

050469428

ABSTRACT:
An injection molding thermal gated nozzle having a nose portion which extends forwardly to the cavity. The nozzle has a melt channel which extends through the nose portion to form the gate. An integral electric heating element has a forward portion with a generally rectangular cross section and a number of adjacent coils which form an inwardly tapered inner surface. Part of the inner surface of the forward portion of the heating element forms an inwardly tapered portion of the melt channel adjacent the gate. This direct contact of the heating element with the melt reduces considerably the cycle time of the thermal gate. The forward portion of the heating element is shaped by compressing it between tapered dies. It is then mounted between forward and rearward portions of the nozzle, and the assembly is integrally brazed together in a vacuum furnace.

REFERENCES:
patent: 4688622 (1987-08-01), Gellert
patent: 4768283 (1988-09-01), Gellert
patent: 4768945 (1988-09-01), Schmidt et al.
patent: 4875848 (1987-10-01), Gellert
patent: 4911636 (1990-03-01), Gellert
patent: 4941249 (1990-07-01), Gellert
patent: 4954072 (1990-09-01), Zimmerman

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