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US 4,688,622 AGranted
Injection molding manifold member and method of manufacture
OwnerJobst U. Gellertinventor
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OwnerJobst U. Gellertinventor
Estimating the term…
This invention relates to an elongated heating manifold member for injection molding and a method of making it. Channels are cut into the steel body to run parallel to a hot runner passage extending through the body. An electric heating element is centrally located in the channels using small spacer clips to provide a space around the heating element, and the channels are sealed at the ends. A highly conductive material such as a copper alloy is cast into the space around the heating element in a vacuum furnace. This forms an integral unit with the copper alloy fused to both the heating element and the steel body which substantially improve heat transfer in the manifold member. This avoids the creation of "hot spots" which otherwise may result in the heating element burning out, and maintains an even temperature along the hot runner passage which reduces deterioration of the melt due to overheating.
The method of manufacturing an integral injection molding manifold member having a hot runner passage extending therethrough and at least one electrically insulated electrical heating element extending therein and generally adjacent the hot runner passage with a terminal portion projecting therefrom, comprising the steps of:
Dependencies are inferred from the claim text.