Extrusion & Post
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EEA extruded film winding wrinkles
Problembeschreibung
EEA extruded film shows transverse wrinkles and longitudinal creases after winding
Ursachenanalyse
Film tension uneven, fluctuating ±20%; film thickness uneven causing inconsistent stretching of each section; after cooling, shrinkage rate differs in all directions
Lösung
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
Wichtigste Erkenntnis
Film wrinkling is caused by tension fluctuation and thickness unevenness; automatic tension control and homogenization are the key
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