Extrusion & Post
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Transverse Ripples on EVOH Extruded Film
Problem Phenomenon
EVOH extruded film surface shows transverse periodic ripples with wavelength 5-10mm
Cause Analysis
Haul-off roller vibration or unstable rotation speed producing periodic stretching changes; chill roll eccentricity or out-of-round surface causing periodic contact pressure changes
Solution
1) Overhaul haul-off rollers to eliminate vibration; 2) Re-round chill roll with eccentricity <0.02mm; 3) Install pressure stabilizing device on extruder to eliminate pressure fluctuations; 4) Stably control haul-off speed ±0.5%
Key Takeaway
Transverse ripples are caused by haul-off vibration and roll eccentricity; equipment overhaul and stable control are key
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