1. Each type of plastic has an ideal processing temperature range, which should control the processing temperature of the barrel and make it close to this temperature range.Granular plastic from the hopper into the cylinder, will first reach the feeding section, the charging period of inevitable dry friction, when the plastic is heated, fused inequality, very easy to cause the inner wall of the cylinder and the screw appearance wear increased.Similarly, in the reduction and homogenization section, if the plastic melt state is unbalanced, it will also cause wear and increase.

2. The speed should be adjusted properly.Some plastics are fortified with a strong agent, such as glass fiber, mineral or other fillings.These materials tend to be much more abrasive to metal than molten plastic.When these plastic injection molding, if with high speed, is in the increase of plastic shear force at the same time, will also strengthen accordingly produce more fiber is torn, torn fiber containing sharp ends, to wear force greatly fill.Inorganic minerals are also very effective when they glide on the surface of metal.Therefore, the speed should not be adjusted too high.
3. The screw is rotated inside the barrel, and the friction between the material and the two is gradually wearing out the professional appearance of the screw and the cylinder. The diameter of the screw is gradually reduced, and the diameter of the inner hole of the cylinder is gradually increased.In this way, the diameter gap between the screw and the cylinder is increased with the gradual wear of the two., however, because of the barrel in front of the nose and shunt plate resistance did not change, it's all been extruded material on leakage flow, the material from the diameter of the clearance flow quantity to fill in the direction of feed.The effect reduced the production of plastic machinery.This kind of phenomenon causes the material to stay in the tube to fill the time, resulting in the decomposition of the material.If it is polyethylene, the decomposition of hydrogen chloride gas enhances the corrosion of the screw and cylinder.
4. Materials such as calcium carbonate and glass fiber fill material, can accelerate the screw and cylinder wear.
5, because the material is not plasticized, or mixed with metal foreign material, the torque force of the screw is suddenly added. This torque exceeds the strength limit of the screw and causes the screw to be broken.This is a kind of extreme damage.