Patent ID: 6666675
Filing Date: 2003-12-23
Classification: B29C

Abstract:
An injection-molding nozzle for resin of highly temperature-dependent viscosity, comprising a cylindrical nozzle main body of which both of middle parts of the front end and rear end are formed into thread shafts and of which an internal center passage is formed of a gently tapered hole; a nozzle tip made of low heat conductivity metal which has a nozzle port of a cap shape and has a tapered hole having an internal side diameter smaller than an exterior side diameter at the center thereof and which is fastened to the nozzle main body by screwing the threads of an inside wall thereof onto said front end thread shaft; and a heating means on the outside wall of said nozzle, characterized in that the internal diameter of said nozzle port and the diameter of the front end hole of the passage of the nozzle main body are set to a range of 0.9-1.5 mm capable of preventing a dropping phenomenon of resin without causing a large pressure loss, and a passage volume is no more than 1.0 cm3 within 70-115 mm in length range of the nozzle main body.