B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/711
B29C 45/73 (2006.01) B23P 15/00 (2006.01) B29C 45/27 (2006.01)
Patent
CA 1265909
ABSTRACT OF THE DISCLOSURE This invention relates to a gate insert which screws into the forward end of an injection molding nozzle and a method of making it. The gate insert has an intermediate portion which extends between a threaded cylindrical rear portion which screws into the nozzle and a cylindrical nose portion which is secured in an opening in the cavity plate and forms the gate. A gradually tapered melt bore extends axially through the gate insert, and an electrical heating element is integrally embedded in the gate insert with a helical portion extending around the melt bore to maintain the temperature of the melt as it flows through the bore. The gate insert is made by forming a body portion with a neck portion having a tapered outer surface extending between the rear portion and the nose portion. A recess is machined in the tapered surface and a helical portion of the heating element is wound in the channel. A nut portion having a matching tapered inner surface is mounted on the neck portion. A slug of nickel alloy is placed in a filler tube which leads to a filler bore extending radially through the nut portion. The assembly is heated in a vacuum furnace to integrally cast the heating element in the channel and bond the nut portion to the body portion.
559000
Gellert Jobst Ulrich
Riches Mckenzie & Herbert Llp
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