Extrusion & Post
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DSTDP extruded film transverse ripples
Problem Phenomenon
DSTDP extruded film surface has transverse periodic ripples, wavelength 5-10mm
Cause Analysis
Haul-off roller vibration or unstable speed producing periodic stretching changes; cooling roller eccentricity or out-of-round surface causing periodic contact pressure changes
Solution
1) Overhaul haul-off roller to eliminate vibration; 2) true the cooling roller, eccentricity <0.02mm; 3) install pressure stabilizing device on extruder to eliminate pressure fluctuation; 4) stable control of haul-off speed ±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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