| 摘要 |
PURPOSE: To provide a nozzle for injection molding unnecessary to replace in both of usual injection molding and the injection molding of a hollow molded article, keeping the stable operation of a needle valve and enabling the desired planning of a mold without being troubled by pressure fluid piping. CONSTITUTION: A control unit 7 has both of a usual molding mechanism and a hollow molded article molding mechanism and can arbitrarily select either one of the mechanisms and can set the operation of a needle valve 5 to either one of them. The opening and closing due to a valve head 52 of a pressure fluid emitting orifice 44 are performed by the separation and contact of a blocking surface 521 and a receiving surface 441 and, since there is no slide part, the penetration of a molten resin can be prevented. Since the inlet 35 of a pressure fluid introducing passage 351 is formed in the vicinity of an injection cylinder 1, pressure fluid piping does not obstruct a mold not shown in a drawing. A loosely fitted sphere 8 can prevent the penetration of a pressure fluid into the injection cylinder 1. |
