SCREW HEAD FOR INJECTION MOLDING MACHINE

摘要

A screw head for an injection molding machine is mounted to a distal end portion of a screw, and includes a trunk portion and a screw portion, and an undercut portion formed between the trunk portion and the screw portion, wherein a relationship between a shaft diameter ~ of the undercut portion and a nominal diameter ~ of the screw portion is defined as: 0.74f ~ e ~ 0.85f and a relationship between the nominal diameter ~ of the screw portion and a radius ~ of curvature of the undercut portion is defined as: 0.5f ~ r