Extrusion & Post
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EVA extruded film has transverse corrugations
Problem Phenomenon
EVA extruded film surface has transverse periodic corrugations with wavelength 5-10mm
Cause Analysis
Traction roller vibration or unstable rotation speed producing periodic stretching changes; cooling roller eccentricity or out-of-round surface causing periodic contact pressure changes
Solution
1) Overhaul the traction 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 traction speed ±0.5%
Key Takeaway
Transverse corrugations are caused by traction vibration and roller eccentricity; equipment overhaul and stable control are key
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