Patent ID: 6709262
Filing Date: 2004-03-23
Classification: B29C

Abstract:
A nozzle cap (10) for securing an injection moulding nozzle tip (12) to a nozzle housing (4) and extending into a gate insert (16), said nozzle (10) cap comprising:a body (30) mountable over said nozzle tip; said body (30) having a housing end having a threaded portion for threadedly engaging said nozzle housing to secure a base flange (22) of said nozzle tip (12) to a recess (23) within said housing (14); said body (30) having a tip end (36) extending about an outlet end (24) of said nozzle tip (12) and having a passage (38) registering with said outlet end (24) of said nozzle tip (12) to pass melt flow emerging from said nozzle tip (12); said tip end (36) being dimensioned to provide a first clearance (40) between said outlet end (24) of said body (30) and said nozzle tip (12) sufficient to provide heat insulation while substantially preventing melt flow therebetween; said tip end (36) further being dimensioned to provide a second clearance (44) between said tip end (36) and said gate insert (16) and said nozzle tip sufficient to provide heat insulation while substantially preventing melt flow therebetween; said body (30) having a medial portion (46) between said tip end (36) and said housing end (32) which is dimensioned to sealingly contact said gate insert (18).