Extrusion & Post
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DSTDP extruded film winding wrinkling
Problem Phenomenon
DSTDP extruded film shows transverse wrinkles and longitudinal creases after winding
Cause Analysis
Film tension uneven, fluctuating ±20%; film thickness uneven causing inconsistent stretching of each section; after cooling, shrinkage differs in each direction
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) fully cool film to <30°C before winding
Key Takeaway
Film wrinkling is caused by tension fluctuation and uneven thickness; automatic tension control and uniformization are key
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