Processing Machinery
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PVC De-HCl Autocatalysis
Problem Phenomenon
Once PVC shows slight degradation, deterioration speeds up faster and faster
Cause Analysis
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.
Solution
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
Key Takeaway
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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