Extrusion & Post
8 views
PVA extruded film wrinkling during winding
Problem Phenomenon
PVA extruded film shows transverse wrinkles and longitudinal creases after winding
Cause Analysis
Film tension uneven, fluctuating ±20%; uneven film thickness causes inconsistent stretching of each section; shrinkage differs in each direction after cooling
Solution
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
Key Takeaway
Film wrinkling is caused by tension fluctuation and uneven thickness; automatic tension control and homogenization are the key
Was this helpful?
0 people found this helpful
Thank you for your feedback!