Extrusion & Post
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Wrinkling During Winding of CMC Extruded Film
Problem Phenomenon
Transverse wrinkles and longitudinal creases appear after winding of CMC extruded film
Cause Analysis
Film tension is uneven, fluctuating ±20%; uneven film thickness causes inconsistent stretching of each section; shrinkage after cooling differs in each direction
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)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 the key
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