Extrusion & Post
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Wrinkling of PU extruded film after winding
Fenómeno do problema
Transverse wrinkles and longitudinal creases appear after PU extruded film is wound
Análise das causas
Film tension uneven with fluctuation of ±20%; uneven film thickness causes inconsistent stretching of each section; shrinkage after cooling differs in each direction
Solução
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
Conclusão principal
Film wrinkling is caused by tension fluctuation and uneven thickness; automatic tension control and homogenization are key
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