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