Extrusion & Post
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Metallocene linear low density polyethylene film cooling line height instability（Variant: Strengthened Measures）
Problem Phenomenon
The cooling line （frost line） height of the blown film fluctuates greatly, and film thickness and quality are unstable.
The cooling line height reflects the stability of cooling conditions and directly affects film performance.In particular, extra attention is needed on top of the original basis, this problem is more prominent and requires key attention.
Cause Analysis
（1） Air ring air volume or air speed unstable\
（2） Extrusion temperature fluctuates\
（3） Ambient airflow interference\
（4） Screw speed fluctuates\
（5） Cooling air temperature fluctuates\
（6） On top of the original basis, extra attention is needed: process parameter fluctuations or equipment status changes aggravate this problem
Solution
（1） Check the air ring fan and valves, ensure stable air volume\
（2） Stabilize the extrusion temperature, fluctuation controlled within ±3°C （190-260°C range）\
（3） Install wind shields or isolation curtains to reduce ambient airflow interference\
（4） Stabilize the screw speed\
（5） Use constant-temperature cooling air to reduce temperature fluctuations\
（6） And strengthen process monitoring; on top of the original basis, extra attention is needed, paying special attention to parameter stability
Key Takeaway
Cooling line instability is caused by fluctuations in cooling or extrusion conditions, requiring stabilization of air ring parameters and environmental conditions.Targeted preventive measures need to be taken in different production scenarios.
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