Extrusion & Post
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Wrinkles in PET film winding
Problem Phenomenon
Transverse or longitudinal wrinkles appear when PET film is wound, increasing the scrap rate.
Cause Analysis
Winding tension control is improper (too large, too small or uneven); uneven film thickness causes uneven stress distribution; roller surface friction is improper.
Solution
Optimize the winding tension curve (tapered tension control); improve thickness uniformity; use spreading rollers and a web guide system.
Key Takeaway
PET film winding quality is a comprehensive reflection of thickness, tension and equipment precision.
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