Extrusion & Post
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EMA Extruded Film Wrinkling During Winding
Problem Phenomenon
Transverse wrinkles and longitudinal creases appear after winding of EMA extruded film
Cause Analysis
Film tension uneven, fluctuating ±20%; film thickness uneven, causing inconsistent stretching of each section; shrinkage rates differ 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 the film to <30°C before winding
Key Takeaway
Film wrinkling is caused by tension fluctuation and uneven thickness; automatic tension control and uniformization are key
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