Extrusion & Post
4 조회수
Metallocene linear low density polyethylene film cooling line height instability
문제 현상
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.
원인 분석
（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
해결 방법
（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
핵심 요약
Cooling line instability is caused by fluctuations in cooling or extrusion conditions, requiring stabilization of air ring parameters and environmental conditions.
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