Extrusion & Post
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PVA extruded film wrinkling during winding
Fenómeno del problema
PVA extruded film shows transverse wrinkles and longitudinal creases after winding
Análisis de la causa
Film tension uneven, fluctuating ±20%; uneven film thickness causes inconsistent stretching of each section; shrinkage differs in each direction after cooling
Solución
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
Conclusión clave
Film wrinkling is caused by tension fluctuation and uneven thickness; automatic tension control and homogenization are the key
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