1. Each plastic has an aspirational plasticization proc […]
1. Each plastic has an aspirational plasticization processing temperature scale, and the barrel processing temperature should be controlled to make it close to this temperature scale. Granular plastics enter the barrel from the hopper and firstly 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 cause increased wear on the inner wall of the barrel and the outer surface of the screw. Similarly, in the compression section and the homogenization section, if the molten state of the plastic is disordered and uneven, wear will increase.
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. In the injection of these plastics, if they are made with a high rotation speed, as the shearing force on the plastic is increased, it will also cause more torn fibers to be strengthened. The torn fibers contain sharp ends, which will cause wear. The force is greatly increased. The scraping effect of inorganic minerals is not small when sliding at high speed on the metal surface. Therefore, the speed should not be adjusted too high.
