Extrusion & Post
12 مشاهدة
Wrinkling of PU extruded film after winding
ظاهرة المشكلة
Transverse wrinkles and longitudinal creases appear after PU extruded film is wound
تحليل الأسباب
Film tension uneven with fluctuation of ±20%; uneven film thickness causes inconsistent stretching of each section; shrinkage after cooling differs in each direction
الحل
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
الخلاصة الأساسية
Film wrinkling is caused by tension fluctuation and uneven thickness; automatic tension control and homogenization are key
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