Extrusion & Post
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Unstable cooling line height of linear low-density polyethylene film (variant: strengthened measures)
Fenómeno del problema
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.
Especially, additional attention is needed on top of the original basis; this problem is more prominent and requires focused attention.
Análisis de la causa
(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
(6) On top of the original basis, additional attention is needed as process parameter fluctuations or equipment condition changes aggravate this problem
Solución
(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
(6) And strengthen process monitoring; on top of the original basis, additional attention is needed to pay special attention to parameter stability
Conclusión clave
Cooling line instability is caused by fluctuations in cooling or extrusion conditions; air ring parameters and environmental conditions need to be stabilized.
In different production scenarios, targeted preventive measures need to be taken.
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