Injection molding manifold member and method of manufacture

Details Injection molding manifold member and method of manufacture Injection molding manifold member and method of manufacture

B - Operations, Transporting

29

C

26/159, 18/709

B29C 45/27 (2006.01) B23P 15/00 (2006.01)

Patent

CA 1174020

ABSTRACT OF THE DISCLOSURE This invention relates to an elongated heated 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.

393671

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