1. Each type of plastic has an ideal plasticizing processing temperature limit. The processing temperature of the barrel should be controlled to be close to this temperature limit. Granular plastics enter the barrel from the hopper and first reach the feeding section. Dry friction is bound to occur in the feeding section. When these plastics are not heated and melted unevenly, it is very easy to cause the inner wall of the barrel and the surface of the chrome-plated rod to increase wear. Similarly, in the compression section and homogenization section, if the molten state of the plastic is uneven, it will also cause faster wear.
2. The speed should be adjusted properly. Because the one-sided plastic is added with strengthening agents, such as glass fiber, mineral materials or other fillers. The friction of these materials 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 more torn fibers in the reinforcement response. The torn fibers contain sharp ends, which will cause wear. The power has grown tremendously. When inorganic mineral materials slide on the metal surface at high speed, the scraping benefits are not small. Therefore, the speed should not be adjusted too high.
3. The chrome-plated rod rotates in the barrel, and the debate between the material and the two causes the working surface of the chrome-plated rod and the barrel to gradually wear out: the diameter of the chrome-plated rod is gradually compressed, and the diameter of the inner hole of the barrel gradually increases. In this way, the joint diameter gap between the chrome-plated rod and the barrel increases little by little with the gradual wear of the two. However, because the resistance of the head and the splitter plate in front of the barrel has not changed, this increases the leakage flow when the extruded material progresses, that is, the amount of material behavior increases from the diameter gap to the feeding direction. As a result, the production of plastic machines has fallen. This phenomenon increases the residence time of the material in the barrel and causes the material to decompose. In the case of polyethylene, the hydrogen chloride gas generated by the decomposition strengthens the corrosion of the chrome-plated rod and the barrel.
4. If there are fillers such as calcium carbonate and glass fiber in the material, it can accelerate the wear of the chrome-plated rod and the barrel.
5. Because the material is not plasticized and symmetrical, there is still metal foreign matter mixed into the material, which makes the rotating torque of the chrome-plated rod abruptly increase. This torque exceeds the strength limit of the chrome-plated rod and causes the chrome-plated rod to twist and break. This is an unconventional accident damage.
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