Processing Machinery
2 Aufrufe
PVC Back Pressure Setting
Problembeschreibung
After PVC back pressure was set high, the melt turned yellow
Ursachenanalyse
Shear heat from high back pressure overheats the melt, and PVC's heat sensitivity amplifies the effect; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Lösung
Control back pressure at the low limit of 0.2-0.5MPa; plasticization relies on temperature, not back pressure; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Wichtigste Erkenntnis
PVC back pressure is managed at the low limit; 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 in the future
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