Extrusion & Post
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HDPE pipe outer surface roughness
Problem Phenomenon
The pipe surface is rough, without gloss, with a granular feel.
Cause Analysis
Low extrusion temperature and poor plasticization; poor raw material quality or high regrind ratio; contamination of the screw and die.
Solution
①Optimize temperature settings; ②use qualified HDPE resin; ③regularly clean the screw, barrel, and die; ④control the regrind ratio.
Key Takeaway
Surface roughness: check temperature, raw material, and cleanliness.
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