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     The screw of screw barrel of injection molding machine is an important part of injection molding machine. Its effect is to transport, compact, melt, stir and pressure the plastic. All these procedures are completed by the screw rotation in the barrel. When the screw rotates, the plastic will collide and move with each other on the inner wall of the barrel, the bottom surface of the screw groove, the pushing surface of the screw edge, and the plastic and plastic. The forward pushing of the plastic is the result of this movement combination, and the heat generated by the conflict is also absorbed to improve the plastic temperature to melt the plastic. The structure of screw will directly affect the degree of these effects. In order to improve the plasticizing quality, the screw can be planned as separate screw, barrier screw or split screw.
Screw type of screw barrel of injection molding machine:
1. Features of gradual change type screw: long tightening section, gentle energy conversion during plasticizing, mostly used for plastics with poor thermal stability such as PVC.
2. Features of mutant screw: shorter tightening section, more intense energy conversion during plasticization, mostly used for polyolefin, PA and other crystalline plastics.

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