Processing Machinery
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PVC Shutdown Purging Material
Problembeschreibung
After purging PVC at shutdown with ordinary material, residue remains
Ursachenanalyse
PVC melt is highly adhesive, and ordinary purging does not clean thoroughly; 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
At shutdown, use dedicated purging material or HDPE for thorough displacement; disassemble and clean when necessary; 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 shutdown cleaning requires thorough displacement with dedicated material; 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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