Injection molding nozzle having nose portion with heating element encircling the bore

In a sprue gated injection molding nozzle having a forward end, a rear end and a central portion, said nozzle having a generally cylindrical outer surface extending between a collar portion adjacent the rear end and a nose portion adjacent the forward end, the nose portion having a substantially smaller outer diameter than the central portion, the nozzle having a central melt bore which extends from an inlet at the rear end to a gate at the forward end, the nozzle having an electrically insulated heating element, said insulated heating element having a rear end, a forward end and a central portion integrally brazed in a spiral channel in the cylindrical outer surface of the central portion of the nozzle, the rear end of the heating element extending out through the collar portion to an electrical terminal, the improvement wherein;

• the electrical heating element has a circular forward end portion adjacent the forward end of the nozzle, said circular forward end portion of the electrical heating element being integrally brazed in the smaller diameter nose portion of the nozzle to substantially encircle the central melt bore extending therethrough.