Material Drying
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PVC Drying Temperature Upper Limit
Fenómeno do problema
PVC dried above 100℃ for long time, pellets yellow and degradation advances during processing
Análise das causas
PVC thermal stability poor, too high drying temperature prematurely consumes heat stabilizer, processing window narrows; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based solely on experience.
Solução
PVC drying temperature 75-90℃ not exceeding 95℃; time 1-2 hours sufficient; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusão principal
PVC drying is a low-temperature short-time route, over-temperature consumes stabilizer; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems later
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