Extrusion & Post
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Rough inner wall of PP pipe extrusion
Problem Phenomenon
Longitudinal lines appear on the inner wall of PP pipes, increasing fluid resistance.
Cause Analysis
The mandrel temperature is low so the output surface is not fully melted flat; die buildup or melt fracture can also cause inner wall lines.; during on-site investigation, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Increase the mandrel temperature; ②clean the die buildup; ③appropriately increase the melt temperature; ④check the die surface condition.; after adjustment, continuously sample and verify the effect, and resume mass production after confirming stability
Key Takeaway
Inner wall quality depends on the mandrel temperature and die condition; temperature control and cleanliness are the two major management points.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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