INJECTION MOLDING NOZZLE FOR OPEN MOLD

摘要

PROBLEM TO BE SOLVED: To supply an injection molding material into a mold even by a postpressurizing phase and to obtain a clearly broken part. SOLUTION: In the injection molding nozzle 1 for the open mold of the type comprising a needle 2 having a plurality of tip ends 3 at the end of the mold to injection mold a molding having a plurality of gate positions in such a manner that the ends 3 are cooperated with an inlet opening of the cavity of the mold at the using position to form an annular gap, the needle 2 is longitudinally slidably held at the inside of the nozzle 1 of the mold and can be drawn back to enlarge the annular gap existing in the area of the ends 3 of the needle.