Extrusion & Post
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LLDPE die gap
Fenómeno del problema
LLDPE blown film produced per the LDPE die gap, bubble unstable and severe sharkskin.
Análisis de la causa
LLDPE melt viscosity is high and shear-sensitive, requiring a larger die gap (0.060-0.100 inches) to reduce shear; During on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience.
Solución
LLDPE die gap configured at 1.5-2.5mm; insufficient gap aggravates shear heat and melt fracture; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Conclusión clave
LLDPE die gap must be larger than LDPE; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future.
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