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Conical Twin Screw and Barrel
Conical Twin Screw and Barrel for PVC Pipe Machine manufacturers show you how to improve the life of the screw barrel
The manufacturer of Conical Twin Screw and Barrel for PVC Pipe Machine tells you that the screw of the injection molding machine works under high pressure, high temperature, high mechanical torque and high friction environment for a long time. The first few factors are required by the process conditions, but the loss caused by friction is inevitable. The manufacturer of Conical Twin Screw and Barrel for PVC Pipe Machine tells you that generally the screw has been treated with surface nitriding to improve the surface hardness, that is, to improve the wear resistance. However, if the cause of wear is ignored and the wear is not minimized, the working life of the screw will inevitably be greatly reduced.
The following two points will introduce the causes of screw wear and the methods to reduce wear:
1. The manufacturer of Conical Twin Screw and Barrel for PVC Pipe Machine tells you that each plastic raw material has an ideal plasticizing processing temperature range, so the processing temperature of the barrel should be controlled to make it close to this temperature range. When the granular plastic enters the barrel from the hopper, it will first reach the feeding section, and dry friction will inevitably occur in the feeding section. When these plastics are not heated enough and melt unevenly, it is easy to cause increased wear on the inner wall of the barrel and the surface of the screw; similarly, In the compression section and the homogenization section, if the molten state of the plastic is disordered, it will also cause increased wear.
2. The speed should be adjusted properly. Conical Twin Screw and Barrel for PVC Pipe Machine manufacturers tell you that because some plastics are added with reinforcements, such as glass fiber, minerals or other fillers. These substances tend to be much more abrasive to metallic materials than molten plastic. When injecting these plastics, if a high rotational speed is used, the shear force on the plastic will be increased, and the reinforcement will correspondingly produce more shredded fibers. The shredded fibers contain sharp ends, causing wear and tear. The force is greatly increased. When inorganic minerals slide at high speed on the metal surface, their scraping effect is not small. So the speed should not be adjusted too high.