Extrusion & Post
10 조회수
Wrinkling of PU extruded film after winding
문제 현상
Transverse wrinkles and longitudinal creases appear after PU extruded film is wound
원인 분석
Film tension uneven with fluctuation of ±20%; uneven film thickness causes inconsistent stretching of each section; shrinkage after cooling differs in each direction
해결 방법
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
핵심 요약
Film wrinkling is caused by tension fluctuation and uneven thickness; automatic tension control and homogenization are key
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