Processing Machinery
3 조회수
PMMA Residence Time
문제 현상
After a 1-hour mid-production shutdown, products yellow and have black specks
원인 분석
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.
해결 방법
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.
핵심 요약
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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