Extrusion & Post
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Transverse corrugations in EAA extruded film
Problem Phenomenon
Transverse periodic corrugations with a wavelength of 5-10mm on the surface of EAA extruded film
Cause Analysis
Vibration of the haul-off roller or unstable speed produces periodic stretching changes; eccentric cooling roller 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 fluctuations; 4) Stably control 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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