Material Analysis
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LLDPE material changeover cleaning
Fenómeno del problema
After switching between LDPE and LLDPE, not switching process parameters causes batch defects
Análisis de la causa
LDPE and LLDPE differ greatly in rheological properties: die gap, air ring type and temperature settings are all different; changing material without changing parameters inevitably causes melt fracture or bubble instability
Solución
①After material changeover, switch the full set of die gap, air ring and temperature; ②archive and recall parameters by material type; ③downgrade and isolate transition-period products; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
LDPE and LLDPE changeover is a full parameter switch; die gap, air ring and temperature are three linked items, none can be omitted; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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