Extrusion & Post
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Unstable frost line height of low density polyethylene film
Problem Phenomenon
The frost line height of blown film fluctuates greatly, film thickness and quality unstable.
Frost line height reflects cooling condition stability, directly affecting film performance.
Cause Analysis
(1) Unstable air ring air volume or air speed
(2) Extrusion temperature fluctuation
(3) Ambient airflow interference
(4) Screw rotation speed fluctuation
(5) Cooling air temperature fluctuation
Solution
(1) Check air ring blower and valves, ensure stable air volume
(2) Stabilize extrusion temperature, control fluctuation within ±3°C (160-220°C range)
(3) Install wind shields or isolation curtains, reduce ambient airflow interference
(4) Stabilize screw rotation speed
(5) Use constant temperature cooling air, reduce temperature fluctuation
Key Takeaway
Unstable frost line is caused by fluctuating cooling or extrusion conditions; air ring parameters and environmental conditions need to be stabilized.
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