Extrusion & Post
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Wrinkles in PET film winding
Fenómeno del problema
Transverse or longitudinal wrinkles appear when PET film is wound, increasing the scrap rate.
Análisis de la causa
Winding tension control is improper (too large, too small or uneven); uneven film thickness causes uneven stress distribution; roller surface friction is improper.
Solución
Optimize the winding tension curve (tapered tension control); improve thickness uniformity; use spreading rollers and a web guide system.
Conclusión clave
PET film winding quality is a comprehensive reflection of thickness, tension and equipment precision.
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