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