Processing Machinery
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LLDPE sharkskin
Fenómeno del problema
LLDPE film sharkskin is more severe than LDPE
Análisis de la causa
LLDPE narrow molecular weight distribution has poor shear-thinning ability and is highly sensitive to melt fracture; when troubleshooting on site, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solución
Large die gap; increase melt temperature; add PPA aid; reduce speed; 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
LLDPE sharkskin requires both equipment and additive measures; 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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