Processing Machinery
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LLDPE screw speed
Fenómeno do problema
After increasing screw speed, LLDPE sharkskin becomes severe
Análise das causas
LLDPE is highly sensitive to shear rate, increasing speed immediately exceeds the critical value; when troubleshooting on site, 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
Solução
Control speed by the melt fracture critical value; add PPA to widen the window; large die gap; 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
Conclusão principal
LLDPE speed management is stricter 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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