Processing Machinery
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PMMA Regrind Limitation
Problem Phenomenon
After mixing regrind, optical quality of transparent parts decreases, and gel particles and impurities increase
Cause Analysis
Even if PMMA regrind is glass-transparent, optically qualified products usually cannot be obtained; thermal history and trace contamination make transparency and purity unrecoverable; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Prohibit regrind in optical transparent parts; ②opaque colored parts can reuse it after thorough drying; ③limit regrind ratio according to product grade; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PMMA regrind and optical quality cannot be achieved together; zero regrind for transparent parts is an industry rule; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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