Extrusion & Post
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Wrinkling of PU extruded film after winding
Fenómeno del problema
Transverse wrinkles and longitudinal creases appear after PU extruded film is wound
Análisis de la causa
Film tension uneven with fluctuation of ±20%; uneven film thickness causes inconsistent stretching of each section; shrinkage after cooling differs in each direction
Solución
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
Conclusión clave
Film wrinkling is caused by tension fluctuation and uneven thickness; automatic tension control and homogenization are key
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