Compact cartridge hot runner nozzle and method of making

Details Compact cartridge hot runner nozzle and method of making Compact cartridge hot runner nozzle and method of making

B - Operations, Transporting

29

C

B29C 45/20 (2006.01) B23P 15/00 (2006.01) B29C 45/27 (2006.01) B29C 45/78 (2006.01) H05B 3/40 (2006.01)

Patent

CA 2692246

The present invention provides an electrically heated nozzle (22) for injection molding which is insulated to prevent conduction of electricity and loss of thermal transmission to the casing, wherein at least a part of the electrical insulation comprises a layer of dielectric insulator material (84) with an electrical resistance wire (80) wound spirally thereabout and another dielectric insulator layer (86) thereover. Also disclosed is a method for making such a nozzle (22) which includes the steps of applying a first insulator layer (84), winding electrical resistance wire (80) about the first insulator layer (84), applying a second insulator layer (86), and applying a casing layer (88) thereover. The first and second insulating layers (84, 86) may be provided by spraying or through telescoping, self-supporting sleeves.

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