Processing Machinery
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PMMA regrind impurities
Fenómeno del problema
Surface impurities increase in PMMA products mixed with regrind
Análisis de la causa
Regrind contains degradation products and contaminant particles, which appear as impurities after molding; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry literature and should be confirmed first during troubleshooting
Solución
Prohibit regrind in optical parts; sieve regrind to remove impurities; control the mixing ratio; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Conclusión clave
Regrind impurities are controlled by prohibition and sieving; 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 problems in the future
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