Extrusion & Post
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Transverse corrugations in PU extruded film
Problem Phenomenon
Transverse periodic corrugations with wavelength 5-10mm on the surface of PU extruded film
Cause Analysis
Haul-off roller vibration or unstable speed produces periodic stretching changes; cooling roller eccentricity or out-of-round surface causes periodic contact pressure changes
Solution
1) Overhaul haul-off roller to eliminate vibration; 2) Round-correct cooling roller eccentricity <0.02mm; 3) Install pressure stabilizing device on extruder to eliminate pressure fluctuation; 4) Stable control of haul-off speed ±0.5%
Key Takeaway
Transverse corrugations are caused by haul-off vibration and roller eccentricity; equipment overhaul and stable control are key
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