Processing Machinery
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HDPE pipe surface roughness
Problem Phenomenon
The pipe outer surface shows orange peel or longitudinal brushed lines, poor gloss, rough touch.
Cause Analysis
Insufficient die head temperature prevents the discharge surface from fully melt-flattening; die buildup scrapes the surface; low melt temperature and poor plasticization also make the surface rough.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
①Increase the die head temperature to make the discharge surface smooth; ②clean the die buildup; ③appropriately increase the melt temperature to improve plasticization; ④check whether the die surface is damaged.; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
For surface roughness, first check the die head temperature and buildup, then check the plasticization state; die cleanliness and temperature are the first influencing factors of surface quality.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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