How can the issue of wettability be addressed when trying to spray micron-scale films onto ultra-thin PET?

2018-07-26View Original

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For the RT/PET substrate, which has a thickness of around 10 μm, it is desired to apply a coating layer about 5 μm thick on its surface. Ultrasonic spraying is used for this purpose, and the dispersion phase in the coating is water-based. The problem encountered so far is that many holes can be seen on the surface when viewed under an SEM after spraying; it is presumed that this is due to the poor wettability of the water-based dispersion system with PET, resulting in a coating layer that does not form a continuous film on the surface. I would like to ask what approach is generally recommended to address infiltrative issues in such cases? The premise is that the coating must be a water-based system, and the thickness of the film layer cannot be too thick, with a maximum of 10μm.

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How can the issue of wettability be addressed when trying to spray micron-scale films onto ultra-thin PET?

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