GAS NOZZLE

摘要

PURPOSE: To form an injection molding with excellent dimensional stability and outward appearance at a low reject rate and in a short cycle time by preventing gas leakage from occurring in gas injection. CONSTITUTION: This gas nozzle for gas injection has a sleeve 3 and an inner cylinder 2 which are provided in such a manner that a clearance A is formed on a tip part open in an intradie space, and is used for the injection of a gas into a die through the inner cylinder 2. The ratio (a)/(b) between the thermal conductivity(a) of the surface of the tip part of the sleeve 3 and the thermal conductivity(b) of the surface of the tip part of the inner cylinder 2 is within the range of 1.5 to 300. Further, the thermal conductivity(a) is within the range of 40 to 500 [W/mh deg.C].