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Uneven coating on PET film
Fenómeno del problema
Streaks, uneven thickness or pinholes appear when coating functional coatings on PET film.
Análisis de la causa
Film surface tension is uneven (locally insufficient dyne value); the coating liquid wets the film poorly; environmental cleanliness is insufficient.
Solución
Ensure uniform corona treatment, all areas ≥42mN/m; optimize the coating liquid formulation to improve wettability; operate in a clean environment.
Conclusión clave
PET film coating uniformity depends on surface treatment quality and coating process control.
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