Processing Machinery
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PMMA Burnt
Problem Phenomenon
Brown burnt marks appear at corners of PMMA products
Cause Analysis
Adiabatic compression of trapped air makes local temperature exceed the degradation temperature, decomposing and discoloring PMMA; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Add venting at burnt locations; reduce end-stage speed; clean vent grooves; after adjustment, take samples continuously 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 burnt is handled by trapped air venting; 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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