Injection molding apparatus having separate heating element in the cavity forming insert
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United States of America Patent
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Oct 29, 1991
Grant Date -
N/A
app pub date -
Dec 31, 1990
filing date -
Nov 19, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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