The cause of screw wear of injection molding machine needs to be found out as soon as possible

The working hours of the injection molding machine are very long every day, so the parts will inevitably be affected after a long time. Especially, if the screw is operated in the environment of high temperature, high pressure and high friction for a long time, it is easy to wear. Therefore, in order to reduce the occurrence of screw wear of the injection molding machine, we should find out the causes of screw wear, Then take measures to reduce.

Each kind of plastic has an ideal plasticizing processing temperature range. The processing temperature of the barrel of the injection molding machine should be controlled to make it close to this temperature range. When granular plastic enters the barrel from the hopper, it will first reach the feeding section. Dry friction will inevitably occur in the feeding section. When these plastics are not heated enough and melt unevenly, it is easy to increase the wear of the inner wall of the barrel and the surface of the screw, Similarly, in the compression section and homogenization section, if the melting state of the plastic is disordered and uneven, it will also increase the wear.

The water contained in the plastic has some impact on the wear of the screw surface of the injection molding machine. If the plastic does not remove all the water before injection molding, when the residual water enters the screw compression section, it will form “steam particles” with high temperature and pressure that are melted and mixed in the molten plastic before injection. With the advancement of the screw during the injection process, these “steam particles” will be formed from the homogenization section to the screw head, In the process of injection, the pressure relief expansion is like fine impurity hard particles, which has a friction and damage effect on the wall.

In addition, for some kinds of plastics, under high temperature and high pressure, water may become a catalyst for plastic cracking, producing harmful impurities that can erode the metal surface. Therefore, the drying work before plastic injection molding is not only directly related to the product quality, but also affects the working life of the screw of the injection molding machine.  

Here is the reason for the wear of the screw of the injection molding machine. I believe you have understood it clearly after reading it. If you want to know more information about the injection molding machine, you can continue to pay attention to our website, and we will provide you with more information in this regard.