Extrusion & Post
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Wrinkling of PU extruded film after winding
Problem Phenomenon
Transverse wrinkles and longitudinal creases appear after PU extruded film is wound
Cause Analysis
Film tension uneven with fluctuation of ±20%; uneven film thickness causes inconsistent stretching of each section; shrinkage after cooling differs in each direction
Solution
1) Automatic tension control system stabilizes winding tension; 2) Improve film thickness uniformity to ±5%; 3) Adjust guide roller parallelism <0.05mm/m; 4) Wind after the film is fully cooled to <30°C
Key Takeaway
Film wrinkling is caused by tension fluctuation and uneven thickness; automatic tension control and homogenization are key
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