Processing Machinery
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PMMA weather resistance limit
Problem Phenomenon
Outdoor PMMA signboards lose gloss and chalk on the surface after several years
Cause Analysis
Ordinary PMMA has a weather resistance limit, and aging accelerates in high-UV regions; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry literature and should be confirmed first during troubleshooting
Solution
Select UV-resistant co-extruded or cast weather-resistant sheets for outdoor parts; inspect and replace regularly; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
Select weather-resistant structural sheets for outdoor applications; 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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