Material Drying
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PA6 Regrind Problems
Fenómeno do problema
After blending regrind, strength declined and silver streaks increased, with unstable quality.
Análise das causas
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.
Solução
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.
Conclusão principal
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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