Processing Machinery
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LDPE Residence Management
Fenómeno del problema
After mid-process shutdown, yellow spots appear on the film.
Análisis de la causa
LDPE melt residing over 30 minutes oxidatively degrades; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; This mechanism has been repeatedly verified by industry literature and should be confirmed first during troubleshooting.
Solución
For shutdown over 20 minutes, lower temperature or purge; at restart, discharge until normal; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability; Change only one variable at a time and record parameter changes to facilitate locating effective measures.
Conclusión clave
LDPE residence is managed by the 30-minute rule; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; Incorporate this case into the defect archive as a troubleshooting reference for similar future problems.
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