Processing Machinery
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PMMA yellowing and aging
Problem Phenomenon
Indoor PMMA products slightly yellow after several years
Cause Analysis
Long-term light exposure and thermo-oxidative aging cause PMMA to yellow slowly, and ultraviolet light accelerates the process; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Keep indoor parts away from direct sunlight; select UV-resistant grades; replace severely yellowed parts; 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
PMMA yellowing is long-term aging, and UV-resistant grades delay it; 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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