Extrusion & Post
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PVA extruded film has transverse corrugations
Problem Phenomenon
PVA extruded film surface has transverse periodic corrugations with wavelength 5-10mm
Cause Analysis
Haul-off roller vibration or unstable rotation speed produces periodic stretching changes; cooling roller eccentricity or out-of-round surface causes periodic contact pressure changes
Solution
1) Overhaul the haul-off roller to eliminate vibration; 2) Round the cooling roller, eccentricity <0.02mm; 3) Install a pressure stabilizing device on the 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 the key
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