Processing Machinery
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LDPE Film Raw Material Melt Index Selection
Problem Phenomenon
After switching to raw material with a different melt index, the process fluctuates greatly.
Cause Analysis
Melt index level directly changes melt viscosity and the optimal temperature window; mixing materials of different melt indexes complicates rheological behavior.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Select the melt index range according to product requirements; ②Re-verify the process after changing melt index; ③Avoid arbitrary material mixing; ④Record process cards for each melt index.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Melt index is the first parameter in material selection; the process must be recalibrated with the melt index.; 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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