Extrusion & Post
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Ridges in PET film winding
Problem Phenomenon
Local protrusions (ridges) appear on the end face after PET film winding, affecting slitting and use.
Cause Analysis
Local film thickness is too thick, forming ridges; winding tension is uneven; the film slips on the roller surface.
Solution
Improve transverse thickness uniformity (automatic die lip control); optimize the winding tension curve; use nip rollers to improve winding flatness.
Key Takeaway
PET film ridges are a comprehensive manifestation of uneven thickness and poor winding.
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