Processing Machinery
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PMMA Residence Time
Problem Phenomenon
After a 1-hour mid-production shutdown, products yellow and have black specks
Cause Analysis
PMMA melt residing at 240℃ for more than 30 minutes accelerates degradation, yellowing and producing carbonized spots; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based on experience alone.
Solution
For shutdowns over 20 minutes, lower temperature to 180℃ or empty; purge material until normal at restart; 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 residence control is managed by the 30-minute red line; 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 future problems.
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