Injection Molding Machine Screw Barrel Improves Plasticization Quality

The screw is an important part of the injection molding machine. Its function is to convey, compact, melt, stir and apply pressure to the plastic.
All these procedures are completed by the rotation of the screw in the barrel. When the screw rotates, the plastic will generate friction and mutual motion against the inner wall of the barrel, the bottom surface of the screw groove, the propulsion surface of the screw edge, and between the plastic and the plastic. The forward advancement of the plastic is the result of this combination of motion, and the heat generated by friction It is also absorbed and used to increase the temperature of plastics to melt them. 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 separation screw, a barrier screw or a split screw.
1. Gradient type Gradient screw features: the compression section is longer, and the energy conversion is gentle during plasticization, and it is mostly used for plastics with poor thermal stability such as PVC.
2. Mutation type The characteristics of mutation type screw: the compression section is short, and the energy conversion is more severe when plasticizing, and it is mostly used for crystalline plastics such as polyolefin and PA.
3. General-purpose General-purpose screw Features: The general-purpose screw with strong adaptability can adapt to the processing of various plastics and avoid frequent screw replacement.