Material Drying
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PA6 Regrind Problems
Problem Phenomenon
After blending regrind, strength declined and silver streaks increased, with unstable quality.
Cause Analysis
PA6 regrind has reduced molecular weight and absorbs moisture faster; repeated reuse causes serious degradation; crushed material contains fine powder and plasticizes unevenly; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Regrind proportion 10%~30%;②re-dry;③prohibit production with 100% regrind;④use all-new material for key stressed parts and appearance parts;⑤establish a ledger corresponding regrind batches to performance.
Key Takeaway
PA6 regrind = 'proportion + drying' dual control: nylon regrind absorbs moisture fast and degrades fast; repeated reuse has high risk, and key stressed parts resolutely use new material; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence.
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