Material Drying
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PMMA Haze Increase and Loss of Transparency
Problem Phenomenon
Product transparency decreases and becomes misty; drying and temperature control records show abnormal periods corresponding to haze batches.
Cause Analysis
Internal stress, uneven cooling or trace moisture all increase haze; contamination and degradation also scatter light, and PMMA optical performance is highly sensitive to process fluctuations.
Solution
①Stabilize drying and melt temperature; ②balance mold temperature for uniform cooling; ③anneal to eliminate internal stress; ④monitor batch by batch with a haze meter.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Haze is a comprehensive quantitative indicator of PMMA optical quality; batch monitoring linked with process records can quickly lock onto the root cause of fluctuations.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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