Extrusion & Post
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CEF extrusion film has transverse corrugations
Problem Phenomenon
The surface of the CEF extruded film has transverse periodic corrugations with a wavelength of 5-10mm
Cause Analysis
The haul-off roller vibrates or the speed is unstable, producing periodic stretching changes; the cooling roller is eccentric or the surface is not round, causing periodic contact pressure changes
Solution
1) Overhaul the haul-off roller to eliminate vibration; 2) Round the cooling roller with eccentricity <0.02mm; 3) Install a pressure stabilizing device on the extruder to eliminate pressure fluctuations; 4) Stable control of the haul-off speed ±0.5%
Key Takeaway
Transverse corrugations are caused by haul-off vibration and roller eccentricity; equipment overhaul and stable control are the key
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