INJECTION MOLDING NOZZLE

摘要

PROBLEM TO BE SOLVED: To open and close a leading end part at an inner hole of a nozzle jacket by constituting the nozzle jacket or an inner pin out of materials largely different in the coefficient of thermal expansion to heat or cool the same. SOLUTION: An injection molding nozzle is constituted of a manifold 2 connected and fixed to the rear end of a cylindrical nozzle jacket 1 in a liquidtight state and the inner pin 15 internally inserted in the nozzle jacket 1 and the manifold 2 and constituted so that the leading end part thereof is constituted so as to make the leading end part of the inner hole of the nozzle jacket 1 openable and closable and the rear end part thereof is fixed to and supported by the manifold 2 in a liquidtight state and the nozzle jacket 1 and the inner pin 15 are formed from materials mutually largely different in the coefficient of thermal expansion.