Hot runner heater device and method of manufacture thereof
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United States of America Patent
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Apr 25, 2006
Grant Date -
Nov 27, 2003
app pub date -
Mar 13, 2003
filing date -
Mar 13, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A heater device used for mold injection processes and related method for manufacturing the same is disclosed. The heater device comprises an inner sleeve having a hollow tubular body with opposed flanges formed at either end thereof and a resistive element applied around the body of the inner sleeve. In assembly, the inner sleeve is disposed inside and engaged to an outer sleeve having a hollow tubular body with opposed openings that communicate with a cavity defined between the inner and outer sleeves. The outer sleeve further defines a first aperture for permitting connection of terminal leads to the resistive element inside the outer sleeve during manufacturing. During manufacture, a slurry of ceramic insulation material is injected through a second aperture in order to completely fill the cavity and encase the resistive element.
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