Processing Machinery
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PVC Profile Discoloration
Problem Phenomenon
Outdoor PVC profiles yellow and discolor after several years
Cause Analysis
UV aging degrades and discolors the PVC surface; the weather-resistant system is insufficient; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
Select weather-resistant formulation (titanium dioxide + UV absorber); co-extrude a weather-resistant layer; verify by xenon lamp aging; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
Outdoor profile weather resistance relies on formulation and co-extruded layer; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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