Processing Machinery
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Rough and dull surface of PP-R pipes
Problem Phenomenon
The outer surface of PP-R pipes is rough, dull, and grainy, clearly different in appearance from qualified pipes.
Cause Analysis
Low melt temperature causes poor plasticization and poor surface replication; poor raw material quality or an excessively high regrind ratio; contamination or wear of the screw and die causing uneven output—all manifest on the surface as roughness and dullness.
Solution
①Optimize and stabilize the temperature settings to ensure sufficient plasticization; ②use qualified PP-R resin and control the regrind ratio; ③regularly clean the screw, barrel, and die; ④check the die surface condition and polish it; ⑤stabilize the extrusion output to avoid pulsation.
Key Takeaway
For rough PP-R pipe surface, investigate in the order of 'temperature → raw material → equipment cleanliness': first ensure plasticization is in place, then check raw material and regrind, and finally clean the equipment; appearance problems are often a mirror of upstream plasticization and raw material quality.
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