Patent ID: 7717698

Claim:
A plasticizing and injection device for a plastics processing machine, comprising: a plasticizing cylinder; a rotatable plasticizing screw arranged in the plasticizing cylinder in an axially immovable manner; an injection plunger arranged in the plasticizing screw ( 8 ) and having a forward end; a linear drive for moving the injection plunger back and forth in relation to the plasticizing screw; an injection cylinder positioned anteriorly of the plasticizing cylinder, and a non-return valve provided at the forward end of the injection plunger and movable back and forth by the injection plunger to execute an injection process within the injection cylinder between a rearward position at the start of the injection process and a forward position after conclusion of the injection process, wherein a melt chamber is formed between a forward end of the plasticizing screw and the non-return valve for formation of an annular gap between the injection plunger and the injection cylinder for accepting plastic melt during the injection process and during a holding pressure phase, while the plasticizing screw continues to rotate during the injection process.