Extrusion & Post
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Ridges in PET film winding
Fenómeno do problema
Local protrusions (ridges) appear on the end face after PET film winding, affecting slitting and use.
Análise das causas
Local film thickness is too thick, forming ridges; winding tension is uneven; the film slips on the roller surface.
Solução
Improve transverse thickness uniformity (automatic die lip control); optimize the winding tension curve; use nip rollers to improve winding flatness.
Conclusão principal
PET film ridges are a comprehensive manifestation of uneven thickness and poor winding.
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