Material Analysis
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PPS Regrind Usage Ratio
Problem Phenomenon
After blending in regrind, part strength decreases, black specks increase, and customer inspection fails
Cause Analysis
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
Solution
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
Key Takeaway
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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