Processing Machinery
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PMMA Melt Temperature Range
Problem Phenomenon
PMMA melt temperature set at 260℃, products yellow and bubbles increase
Cause Analysis
Above 250℃ PMMA melt thermal degradation accelerates, and methyl methacrylate monomer is released forming bubbles and yellowing; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based on experience alone.
Solution
Melt temperature controlled at 200-250℃; optical parts take 220-240℃; overheated material must be purged and must not be used; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
PMMA melt upper limit is 250℃, and over-temperature degradation is irreversible; 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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