INJECTION HOLDING MACHINE AND METHOD FOR INJECTION MOLDING

摘要

PROBLEM TO BE SOLVED: To realize stably uniform plasticizing and stable control of a resin. SOLUTION: The injection molding machine comprises a charging unit 26 for forwarding a charging plunger 44 to inject a resin from an injection nozzle 47 by an operation of a charging cylinder 51, a plasticizer 25 for rotating a plasticizing screw 29 by an operation of a hydraulic motor 30 to supply the resin to a resin reservoir 48 of a charging heating cylinder 43, and a melt resin pressurizing or pressure reducing unit 27 for pressurizing or pressure reducing the resin of the reservoir 48 by moving a forced plunger 56 by an operation of a pressing driver 57. In this case, a back pressure or the like in a resin pressure in an injecting step or a suck back step is controlled by a four-way directional servo valve 90.