Injection molding apparatus having separate heating element in t

Details Injection molding apparatus having separate heating element in t Injection molding apparatus having separate heating element in t

1990-12-31

1991-10-29

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

26432815, 425568, 425570, B29C 4520

Patent

active

050611747

ABSTRACT:
Apparatus for thermal gated injection molding having a cavity forming insert separate from the heated nozzle. The cavity forming insert has a combination of heating and cooling extending around a central melt bore leading to a gate. The cavity forming insert has an integral electric heating element with an inner portion having a number of adjacent coils near the gate. Power to the heating element is switched on and off during the thermal gated cycle, and the combination of heating and cooling in the cavity forming insert improves the thermal response and shortens the cycle time.

REFERENCES:
patent: 4622001 (1986-11-01), Bright et al.
patent: 4688622 (1987-08-01), Gellert
patent: 4768945 (1988-09-01), Schmidt et al.
patent: 4875848 (1989-10-01), Gellert
patent: 4911636 (1990-03-01), Gellert
patent: 4941249 (1990-07-01), Gellert

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