Patent ID: 6284167
Filing Date: 2001-09-04
Classification: B29C

Abstract:
A method of purging leaked resin in a preplasticizing injection molding machine having an injection device including an injection plunger having a head portion and a shaft portion, the head portion having a larger diameter than the shaft portion, said method including a metering operation and further comprising the steps of:forcibly retracting the injection plunger to a forced retraction position which is a pre-determined position that exceeds the metering completed position;forcibly restoring the injection plunger to a position at or slightly displaced from said metering completed position;said forcibly retracting and forcibly restoring steps being performed periodically with respect to said metering operation;wherein said forced retraction position is a position representing an increased retraction position from any suck back position to which the plunger may retract beyond the metering completed position.