Injection molding nozzle having circumferentially spaced conductive probes
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United States of America Patent
Stats
-
May 1, 1990
Grant Date -
N/A
app pub date -
Mar 1, 1989
filing date -
Feb 10, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An injection molding multi-gate nozzle with a central portion having a central melt bore and a spiral electrical heating element integrally brazed in a channel in its outer surface. The nozzle has a number of elongated conductive probes spaced in a sleeve portion which extends around the central portion adjacent its forward end. Each probe extends in the sleeve portion a predetermined distance rearwardly along the central portion and projects from the sleeve portion a predetermined distance forwardly of the forward end of the central portion. Each conductive probe has a copper inner portion which picks up heat from the adjacent coils of the heating element and carries it forwardly to the projecting forward portion adjacent one of the gates. In addition to providing additional heat, this configuration with the forwardly projecting probes provides the mold with more structural strength and improved cooling.
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