Extrusion & Post
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MP extruded film transverse waviness
Fenómeno do problema
MP extruded film surface has transverse periodic waviness, wavelength 5-10mm
Análise das causas
haul-off roller vibration or unstable speed producing periodic stretching variation; cooling roller eccentricity or non-round surface causing periodic contact pressure variation
Solução
1) overhaul the haul-off roller to eliminate vibration; 2) true 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%
Conclusão principal
transverse waviness is caused by haul-off vibration and roller eccentricity; equipment overhaul and stable control are key
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