1. Each plastic has an ideal plasticizing temperature processing range, and the processing temperature of the wire drawing machine barrel should be controlled to make it close to this temperature range. When granular plastic enters the barrel from the hopper, it will first reach the feeding section. Dry friction will inevitably occur in the feeding section. When these plastics are not heated enough and melted unevenly, it is easy to increase the abrasion of 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 and uneven, it will also cause faster wear.

2. The speed should be adjusted properly. Because some plastics are added with strengthening agents, such as glass fibers, minerals or other fillers. The friction of these substances on metal materials is often much greater than that of molten plastics. When injection molding these plastics, if they are made with a high rotation speed, while increasing the shearing force to the plastic, it will also cause the reinforcement to produce more shredded fibers. The shredded fibers contain sharp ends, which will cause abrasion. The strength is greatly increased. When inorganic minerals slide at high speed on the metal surface, their scraping effect is not small. So the speed is not directly adjusted too high. 

3. The screw rotates in the barrel, and the friction between the material and the two causes the working surface of the screw and the barrel to gradually wear: the diameter of the screw gradually decreases, and the diameter of the inner hole of the barrel gradually increases. In this way, the matching diameter gap between the screw and the barrel increases a little as the two gradually wear. However, since the resistance of the head and the splitter plate in front of the barrel has not changed, this increases the leakage flow of the extruded material when it advances, that is, the amount of material flowing from the diameter to the feeding direction increases. As a result, the output of plastic machinery has fallen. This phenomenon increases the residence time of the material in the barrel and causes the material to decompose. If it is polyvinyl chloride, the hydrogen chloride gas produced by decomposition strengthens the corrosion of the screw and barrel.

4. If there are fillers such as calcium carbonate and glass fiber in the material, it can accelerate the abrasion of the screw and barrel.

5. Because the material is not plasticized uniformly, or metal foreign matter is mixed into the material, the screw torque is suddenly and abnormally increased. This torque exceeds the limit strength of the screw, causing the screw to twist and break, which is an unconventional accident damage .