NOZZLE FOR INJECTION MOLDING MACHINE

摘要

PROBLEM TO BE SOLVED: To provide a nozzle for an injection molding machine of low cost constituted so as to be capable of preventing stringing. SOLUTION: The recessed surface 3b facing to the resin passage 2a in a hot runner 2 is formed to the inner end surface of the nozzle tip 3 attached to the outlet part of the hot runner 2 and a nozzle orifice 3a is opened to the recessed surface 3b. Further, the disc-shaped piece member 4 superposed on the outer peripheral edge part of the rising part 3c formed to the outer periphery of the recessed surface 3b of the inner end surface of the nozzle tip 3 is provided and opening parts 4a are formed to the part not opposed to the nozzle orifice 3a of the piece member 4. The part opposed to the nozzle orifice 3a of the piece member 4 becomes the shield part 4b shielding the nozzle orifice 3a with respect to the resin passage 2a to prevent stringing. The width of the gap between the piece member 4 and the recessed surface 3b is set to 10-50% of the diameter of the nozzle orifice 3a to the recessed surface 3b and the peripheral wall surfaces of the opening parts 4a are formed as inclined surfaces 4c inclined to the insides of the opening parts 4a toward the nozzle tip 3.