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When the raw material is wet, some small bubbles on the surface of the PE water supply pipe will form pits after setting. This kind of pits have a small tail formed by stretching in the opposite direction of extrusion. The drying process was done. When there are impurities in the raw material that are difficult to plasticize, some pitting points will also be generated. When the pitting point is relatively large, the impurities in the middle of the pitting point can be seen. At this time, it is necessary to increase the processing temperature or replace the raw material.