Why do PE pipes have pockmarks

People who frequently come into contact with PE pipes should know that during the selection process, they may find that some pipes have pockmarks on the surface. Many people are worried that this may be due to the quality of the pipes. In fact, there is no need to worry when such a situation occurs in the pipes. Today, the editor will take you to understand the reasons for the pockmarks on PE pipes.
1. It is possible that the raw materials in the equipment head and barrel have undergone oxidation and deterioration due to prolonged heating, resulting in the formation of large pits or cavities in the PE pipe during basic production. This phenomenon is particularly evident when recycled materials are added during the production of some unqualified pipelines. Therefore, when this situation occurs again, it is necessary to better control the temperature during processing and the time of the materials in the barrel. The improvement effect is also significant after rapid cooling or regular cleaning.
2. Also, when the moisture content in the material is relatively high, bubbles are more likely to appear on the surface of the pipe. After shaping, some pitting will form on the surface, so we need to dry the raw materials to reduce the moisture content.
3. When the cooling water volume in the equipment shaping set is uneven, it can also cause some pitting on the surface of the pipe. The main reason for this situation is that as the pipe diameter increases, the amount of water required for further cooling also increases. This makes it difficult to form a complete water film. Therefore, when we encounter this situation again, we need to adjust the water flow rate of the inlet pipe and the flow channel pores appropriately. Increasing the water flow rate appropriately and ensuring even film formation of the cooling water can solve the problem.
After the above introduction, I believe everyone also knows the reasons for the occurrence of pitting in PE pipes. The impact caused by the use of such pipes is not very significant, but we still need to avoid this situation as much as possible during production.