Extrusion & Post
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Uneven coating on PET film
Problembeschreibung
Streaks, uneven thickness or pinholes appear when coating functional coatings on PET film.
Ursachenanalyse
Film surface tension is uneven (locally insufficient dyne value); the coating liquid wets the film poorly; environmental cleanliness is insufficient.
Lösung
Ensure uniform corona treatment, all areas ≥42mN/m; optimize the coating liquid formulation to improve wettability; operate in a clean environment.
Wichtigste Erkenntnis
PET film coating uniformity depends on surface treatment quality and coating process control.
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