Material Drying
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PA66 regrind deterioration
Problem Phenomenon
Regrind products become brittle, performance declines.
Cause Analysis
Heat history + fast moisture absorption; molecular weight drops; repeated reuse causes severe degradation; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience; during troubleshooting, confirm item by item around key factors such as regrind and embrittlement to avoid misjudgment.
Solution
①Ratio 10%~30%; ②re-dry regrind before use to avoid excessive moisture; ③prohibit production with 100% regrind; ④use virgin material for critical load-bearing and appearance parts; ⑤establish a ledger corresponding regrind batches to performance.
Key Takeaway
PA66 regrind='ratio + drying': high-temperature nylon regrind degrades fast; repeated reuse risk is high, use new material for critical parts; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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