Material Drying
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PVC Regrind Use Problems
Fenómeno do problema
After adding regrind, products yellow quickly, black specks increase, performance declines.
Análise das causas
PVC regrind has consumed part of stabilizer and experienced heat history; crushed material contains moisture and dust; regrind's thermal stability reserve is discounted, easier to degrade; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based solely on experience.
Solução
①Regrind proportion controlled with additional stabilizer; ②Regrind dried and decontaminated; ③Downgrade use to non-appearance parts; ④Avoid multiple reuses; ⑤Establish correspondence ledger of regrind batches and performance.
Conclusão principal
PVC regrind = 'stabilizer reserve discounted': use less and cautiously, and add stabilizer; PVC regrind's heat history directly determines remaining stability, multiple reuse risk is extremely high.
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