Extrusion & Post
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Unstable cooling line height of linear low-density polyethylene film
Problem Phenomenon
The cooling line (frost line) height of the blown film fluctuates greatly, and film thickness and quality are unstable.
Cooling line height reflects the stability of cooling conditions and directly affects film performance.
Cause Analysis
(1) Air ring air volume or air speed is unstable
(2) Extrusion temperature fluctuates
(3) Ambient airflow interference
(4) Screw speed fluctuates
(5) Cooling air temperature fluctuates
Solution
(1) Check the air ring fan and valves to ensure stable air volume
(2) Stabilize extrusion temperature, controlling fluctuation within ±3°C (190-250°C range)
(3) Install wind shields or isolation curtains to reduce ambient airflow interference
(4) Stabilize screw speed
(5) Use constant-temperature cooling air to reduce temperature fluctuation
Key Takeaway
Cooling line instability is caused by fluctuations in cooling or extrusion conditions; air ring parameters and environmental conditions need to be stabilized.
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