Material Analysis
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LLDPE narrow molecular weight distribution
Problem Phenomenon
LLDPE film has good optical properties but unsatisfactory impact strength and narrow processing window
Cause Analysis
LLDPE's narrow molecular weight distribution brings excellent optical and downgauging properties, but short-chain branches do not provide shear thinning and viscosity is high under high shear; narrow MWD also limits the processing window
Solution
①Choose wide-MWD or metallocene grades for high-impact needs; ②appropriately raise processing temperature to compensate viscosity; ③set process by grade MWD characteristics; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
LLDPE's narrow MWD is a trade-off between performance and processability; optical and downgauging advantages must be realized through process refinement; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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