INJECTION MOLDING MACHINE FOR FOAM MOLDING AND CONTROL OF RESIN PRESSURE IN MELTING ACCELERATING PROCESS

摘要

PROBLEM TO BE SOLVED: To control the resin pressure on the leading end side of a plasticizing screw regardless of the number of rotations of a screw. SOLUTION: When a screw shaft 37 is rotated at a retreat position to accelerate stirring, resin pressure is detected by a pressure sensor 92 to control the number of rotations of the adjusting motor of a substrate resin supply amt. adjusting device 100 by the signal from an injection system controller so as to control the resin pressure to constant set pressure and the supply amt. of a substrate resin is adjusted. That is, when the resin pressure is ready to exceed the set pressure, the number of rotations of the adjusting motor is lowered to reduce the supply amt. of the substrate resin and, in the reverse case, the number of rotations thereof is raised.