Processing Machinery
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PVC De-HCl Autocatalysis
Fenómeno del problema
Once PVC shows slight degradation, deterioration speeds up faster and faster
Análisis de la causa
PVC degradation removes HCl, HCl in turn catalyzes further degradation, forming self-accelerating vicious circle; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based solely on experience.
Solución
Upon finding degradation signs, immediately stop and clean; ensure heat stabilizer dosage; avoid any overheating points; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
PVC degradation is an autocatalytic process, must be handled at first time; 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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