Extrusion & Post
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LLDPE blown film output limitation
Problem Phenomenon
Speeding up causes sharkskin; output cannot increase.
Cause Analysis
The sharkskin critical shear rate limits output; without treating exit shear, only low speed is possible.
Solution
①PPA coating; ②increase die temperature; ③enlarge the die lip gap; ④optimize die head flow channel to reduce exit stress.
Key Takeaway
Output bottleneck = exit shear; crack it systematically.
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