B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/703
B29C 45/74 (2006.01) B23P 15/00 (2006.01) B29C 45/27 (2006.01)
Patent
CA 1238161
ABSTRACT This invention relates to an improved method of making nozzles for injection molding. The nozzles are heated by an electrical heating element which is cast in a copper portion between inner and outer stainless steel portions. The method includes making a main rear portion and a steel nose cap portion separately, brazing them together in a vacuum furnace to form an integral unit, and then finishing it by drilling and machining to provide it with a central bore and a particular gating configuration. This method has the advantage that a single inventory of unfinished nozzles can be maintained, from which a requirement for one of several gating configurations can be quickly supplied by finishing the nozzles according to that configuration.
496645
Bereskin & Parr
Gellert Jobst Ulrich
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