Material Drying
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PVC Regrind Use Problems
Problem Phenomenon
After adding regrind, products yellow quickly, black specks increase, performance declines.
Cause Analysis
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.
Solution
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.
Key Takeaway
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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