Extrusion & Post
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CEF extrusion film winding wrinkling
Fenómeno del problema
After the CEF extruded film is wound, transverse wrinkles and longitudinal creases appear
Análisis de la causa
The film tension is uneven and fluctuates ±20%; the film thickness is uneven, causing inconsistent stretching of each section; the shrinkage rate after cooling is anisotropic
Solución
1) Automatic tension control system to stabilize the winding tension; 2) Improve the film thickness uniformity to ±5%; 3) Adjust the guide roller parallelism <0.05mm/m; 4) Fully cool the film to <30°C before winding
Conclusión clave
Film wrinkling is caused by tension fluctuations and uneven thickness; automatic tension control and homogenization are the key
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