The reason why the HDPE Pipe is generated is that the flow velocity between the wall and the inner wall is different when the melt flows in the cylinder. When leaving the die, the entire melt is not subjected to the resistance, and the difference between the two becomes zero. It is the change of the relative movement speed of each layer that causes the melt flow at the die to produce intense oscillation, which causes such phenomena to occur! So what is the solution?
1. Adding auxiliaries: like silicone auxiliaries (silicone plastic additives) or propylene polymer additives (PPA).
2. The appropriate increase in temperature can also improve melt flow!
Squeezing HDPE pipe, sometimes because of the temperature, sometimes more or less patterns due to the type of raw materials, but sometimes it is to increase the temperature, the shape of the plastic is still somewhat. I have tried to raise the wind ring on the membrane head, or to raise it.
3.Choose the assured wear resistance HDPE Pipe must first determine the appropriate material. In the past, the pipes used for water supply were mainly cast iron pipes. The outdoor mainly uses sand mold cast iron pipes, and the indoor uses galvanized cast iron pipes, which can be divided into cold (electric) galvanizing and hot galvanizing. The galvanized pipe is used as a water pipe. After a few years of use, a large amount of rust is generated in the pipe. The yellow water that flows out not only pollutes the sanitary ware, but also is mixed with bacteria that grow on the inner wall of the slick. The rust causes the heavy metal content in the water to be too high, which seriously endangers the health of the human body. More importantly, the high performance HDPE pipe is not expensive.
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