Material Analysis
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PPS Regrind Usage Ratio
Fenómeno del problema
After blending in regrind, part strength decreases, black specks increase, and customer inspection fails
Análisis de la causa
The thermal history of PPS regrind degrades performance; the conventional regrind ratio does not exceed 25-30%; when UL certification is required, regrind is limited to within 25%; regrind must be fully dried and clean
Solución
①Control the regrind ratio within 25-30%; ②Regrind ≤25% for UL-certified parts; ③Dry regrind before use and verify by batch; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Conclusión clave
PPS regrind management has clear ratio discipline; the 25-30% upper limit plus drying verification, stricter for UL parts; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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