B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 45/20 (2006.01) B29C 45/27 (2006.01) B29C 45/74 (2006.01)
Patent
CA 2083413
An injection molding nozzle and method of making it having an electrical heating element extending in a pair of alternating coils in a spiral channel around a central melt passage. The heating element has a U-shaped bend near the forward end of the nozzle and two ends at an external terminal-near the rear end. A central wire in the heating element has a fine coiled heating portion extending between two larger diameter conductive portions which extend to the terminal. One of the conductive portions of the central wire is a predetermined length longer than the other and extends in one of the alternating coils of the heating element along a rear portion of the nozzle adjacent the terminal. The heating portion of the wire extends in both of the alternating coils of the heating element along a forward portion of the nozzle so the heating element provides substantially less heat along the rear portion than along the forward portion of the nozzle.
4437667 Canada Inc.
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
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