| 摘要 |
<p>An insulated injection molding nozzle (24) having several alternating layers (98,100,102,104,106,108) of stainless steel and ceramic insulating material surrounding an integral spiral electrical heating element (88). The coils (96) of the heating element (88) are wound around a central cylindrical portion (76) of the body (74) of the nozzle (24) extending between larger diameter rear and forward collar portions (78,80). The alternating layers are plasma sprayed over the coil (96) from a thin inner stainless steel layer (98) to a thick outer stainless steel layer (108). The heating element (88) and an outer shoulder portion (122) are vacuum brazed in two stages to provide a completely integral structure. <IMAGE></p> |
