Processing Machinery
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PMMA Sanding Whitening
Problem Phenomenon
Whitening and hazy surface appear in sanded and polished areas, losing transparency.
Cause Analysis
Local overheating or excessive pressure during sanding causes stress whitening of the surface material; deep scratches left by skipping sandpaper grits too far also appear white.; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based on experience alone.
Solution
①Move sandpaper in circular motion to avoid local overheating; ②increase fineness step by step to above 600 grit; ③control sanding pressure; ④fine polish with polishing compound when necessary.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Sanding whitening is the combined action of heat and stress; standardized step-by-step sanding process can balance efficiency and transparency recovery.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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