How can I improve the screw barrel

Injection molding screw is a long time in high temperature, high pressure, high mechanical torque and high friction environment. The first several factors are the requirements of technological conditions, while the loss caused by friction is unavoidable. The normal screw has been treated with surface nitrification to improve the surface hardness, which is to improve the wear resistance. However, if you ignore the cause of wear and tear, not try to minimize the wear and tear, it will greatly reduce the working life of the screw.

The following illustrates the cause of the screw wear and the method of reducing wear

1. Each type of plastic has an ideal working temperature range of ideal plasticizing, which should control the processing temperature of the cylinder, so as to bring it close to the 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 surface wear. Similarly, in compression and homogenization, if the melting state of plastic is uneven, it can also cause wear increase.

2. The speed should be adjusted properly. As part of the plastic add a fortifier, such as glass fiber, mineral or other fillings. These materials tend to be much more abrasive 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 end, the wear and tear strength increased greatly. Inorganic minerals can be used to scrape the metal surface at high speed. So the speed should not be set too high.