Electrostatically assisted coating method and apparatus with...

B - Operations – Transporting – 05 – D

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B05D 1/04 (2006.01) B05B 5/00 (2006.01) B05C 5/00 (2006.01) B05D 1/30 (2006.01) B05D 1/00 (2006.01) B05D 1/26 (2006.01)

Patent

CA 2402969

A system for applying a fluid coating onto a substrate includes forming a fluid wetting line by introducing a stream of fluid onto a first side of the substrate along a laterally disposed fluid-web contact area. An electrical force is created on the fluid from an effective electrical field originating from a location on the second side of the substrate and at a location substantially at and downstream of the fluid contact area. The electrical field can be generated in a highly effective manner relative to the coating fluid by a sharply defined electrode on the second side of the substrate. Ultrasonics combined with electrostatic fields further enhances coating process conditions and coating uniformity.

La présente invention concerne un système d'application de revêtement fluide sur un substrat par formation d'une ligne mouillante fluide grâce à l'introduction d'un courant de fluide sur une première face du substrat le long d'une zone de contact du fluide-bande se présentant latéralement. En l'occurrence, on crée une force électrique s'appliquant sur le fluide à partir d'un champ électrique effectif depuis un endroit de la seconde face du substrat, et jusqu'à un endroit sensiblement au niveau de la zone de contact du fluide, mais en aval de celle-ci. Le champ électrique peut être produit de façon très efficace par rapport au fluide de revêtement grâce à une électrode finement définie sur la seconde face du substrat. Des champs ultrasoniques se combinant à des champs électrostatiques améliorent encore plus les conditions de traitement du revêtement et l'uniformité du revêtement.

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