Material Drying
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PMMA Drying Time Calculation
Problem Phenomenon
PMMA dried only 3 hours before startup, lenses show dense small bubbles
Cause Analysis
Although PMMA moisture absorption is not strong, optical parts have zero tolerance for bubbles, and 3 hours of drying is insufficient to remove core moisture; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based on experience alone.
Solution
PMMA drying time 4-8 hours, thick pellets take the upper limit; moisture content controlled at 0.02-0.04%; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Optical-grade PMMA drying must be given sufficient time, with moisture content judged by actual measurement; 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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