Processing Machinery
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PVC Barrel Temperature Zoning
Problembeschreibung
PVC plasticization uneven, products contain unmelted material and local yellowing
Ursachenanalyse
Barrel temperature gradient unreasonable, front zone too high degrading while rear zone under-plasticized; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based solely on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Lösung
Barrel gradient: rear zone 150℃, middle zone 170℃, front zone 185℃; feed zone cooling to prevent bridging; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Wichtigste Erkenntnis
PVC temperature gradient must be gentle, strictly prevent front zone overheating; 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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