Extrusion & Post
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EVOH Extruded Film Winding Wrinkles
Problem Phenomenon
EVOH extruded film shows transverse wrinkles and longitudinal creases after winding
Cause Analysis
Film tension uneven, fluctuating ±20%; uneven film thickness causing inconsistent stretching of each section; shrinkage differs in each direction after cooling
Solution
1) Automatic tension control system to stabilize winding tension; 2) Improve film thickness uniformity to ±5%; 3) Adjust guide roller parallelism <0.05mm/m; 4) Fully cool film to <30°C before winding
Key Takeaway
Film wrinkling is caused by tension fluctuation and uneven thickness; automatic tension control and homogenization are key
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