Extrusion & Post
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PPO Extrusion Surface Defects
Problem Phenomenon
[Problem Phenomenon] Rough surface and sharkskin texture on PPO extruded tubes and rods
Cause Analysis
Improper die temperature and excessive melt exit shear cause surface defects; when the die land is insufficient, the melt exit is unstable; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Optimize die temperature and land; reduce extrusion speed to reduce exit shear; polish die flow channels to reduce resistance; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
For PPO extrusion surface check die temperature and land; speed reduction and polishing assist; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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