What is the cause of screw wear? (1)


1. Each plastic has an ideal plasticizing processing te […]

1. Each plastic has an ideal plasticizing processing temperature range. The barrel processing temperature should be controlled to make it close to this temperature range. The granular plastic enters the feeding barrel from the hopper, and it will first reach the feeding section. Dry friction will inevitably occur in the feeding section. When these plastics are insufficiently heated and the melting is uneven, it is easy to cause increased wear on the inner wall of the barrel and the screw surface. Similarly, in the compression section and the homogenization section, if the molten state of the plastic is disordered, it will also cause faster wear.
2. If there are fillers such as calcium carbonate and glass fiber in the material, it can accelerate the wear of the screw and barrel.
3. Since the material is not plasticized evenly, or there is metal foreign matter mixed into the material, the torque of the screw rotation increases suddenly. This torque exceeds the strength limit of the screw, causing the screw to twist.