Processing Machinery
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PMMA Regrind Limitation
Fenómeno del problema
After mixing regrind, optical quality of transparent parts decreases, and gel particles and impurities increase
Análisis de la causa
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
Solución
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
Conclusión clave
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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