The screw of the screw barrel of the injection molding […]
The screw of the screw barrel of the injection molding machine is an important part of the injection molding machine. Its role is to transport, compact, melt, agitate and apply pressure to plastics. All of these procedures are accomplished by the rotation of the screw within the barrel. When the screw rotates, the plastic will produce friction and mutual movement between the inner wall of the barrel, the bottom surface of the groove, the advancement surface of the screw, and the plastic and the plastic. The forward advancement of the plastic is the result of the combination of the motion, and the heat generated by the friction. It is also absorbed to increase the plastic temperature to melt the plastic. The structure of the screw will directly affect the extent of these effects. In order to improve the plasticizing quality, the screw can be designed as a separate screw, a barrier screw or a split screw.
Screw type of injection molding machine screw barrel:
1. Gradient type gradient screw features: long compression section, energy conversion during plasticization is moderate, and it is mostly used for plastics with poor thermal stability such as PVC.
2, mutant mutant screw features: shorter compression section, energy conversion during plasticization is more intense, mostly used in polyolefin, PA and other crystalline plastics.