Extrusion & Post
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Ridges in PET film winding
Fenómeno del problema
Local protrusions (ridges) appear on the end face after PET film winding, affecting slitting and use.
Análisis de la causa
Local film thickness is too thick, forming ridges; winding tension is uneven; the film slips on the roller surface.
Solución
Improve transverse thickness uniformity (automatic die lip control); optimize the winding tension curve; use nip rollers to improve winding flatness.
Conclusión clave
PET film ridges are a comprehensive manifestation of uneven thickness and poor winding.
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