Composite nozzle cap

A nozzle cap for securing an injection molding nozzle tip to a nozzle housing and extending into a gate insert, said nozzle tip having an inner end opposite an outer end, said inner end having a securing flange extending radially outwardly thereabout, for clamping securement between said nozzle cap and said nozzle housing, said nozzle cap comprising:

• a first part having a housing end opposite a connector end with a passage therethrough for receiving said nozzle tip, said housing end being dimensioned to engage said base flange, said first part having a threaded portion for threadedly engaging said nozzle housing for said clamping securement;
• a second part secured at a first end to said first part and having a recess for receiving said nozzle tip, said second part having a tip end opposite said first end with an outlet passage therethrough for registering with a melt outlet of said nozzle tip to pass melt emerging from said melt outlet;
• said tip end of said second part being dimensioned to sealingly engage said outer end of said nozzle tip and said gate insert to avoid melt flow between said tip and said outer end of said nozzle and between said tip end and said gate insert;
• said tip portion being of a thermoplastic polymer useable at a selected operating temperature of said nozzle tip.