Processing Machinery
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PVC Shutdown Purging Material
Fenómeno del problema
After purging PVC at shutdown with ordinary material, residue remains
Análisis de la causa
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
Solución
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
Conclusión clave
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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