Extrusion & Post
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PC UV Yellowing and Aging
Problem Phenomenon
[Problem Phenomenon] PC outdoor parts yellow and chalk, with insufficient weather resistance
Cause Analysis
PC has poor UV resistance and undergoes photo-oxidative yellowing under ultraviolet light; outdoor applications must add UV stabilizers or coatings; when troubleshooting on site, verify each item according to this mechanism one by one, and avoid blindly adjusting the machine based on experience alone
Solution
Select weather-resistant grades or coatings for outdoor parts; xenon lamp aging verification; avoid long-term unprotected exposure to the sun; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PC fears UV; outdoor parts must have stabilizers or coatings; 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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