Injection molding machine

An injection molding machine, comprising:

• a mold tool defining a mold cavity (10);
• a material cylinder (1) defining a vestibule (5) communicating with said cavity;
• an injection piston (2) movable in said material cylinder for injecting material from said vestibule into said cavity;
• material supply means (4) connected to said cylinder for supplying material to said vestibule;
• hydraulic actuator means (8) operatively connected to said injection piston and to said cylinder for moving said injection piston;
• control means (14) connected to said actuator means for actuating and controlling the pressure supplied by said actuator means during an injection phase (1) to move said injection piston to inject material into said cavity, during a means at the end of the dwell pressure phase used as an initial desired value for the solidification phase;
• said control means further including holding means (39) for receiving and holding the measured actual pressure value of said second pressure monitoring means during the injection phase, and said pressure control means having a tool pressure controller (33) for switching the actuator means to a dwell pressure phase when an initial desired cavity pressure (21) is reached and for maintaining pressure value (69) of said second pressure monitoring means during said injection phase as an initial desired value for said dwell phase, said holding means holding at least one of an actual cylinder and vestibule pressure when at least a part of the material in the cavity solidifies, said actual value being used to control the actuator means for the solidification phase.