Multiple layer and slide die coating method and apparatus

B - Operations – Transporting – 05 – D

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B05D 1/26 (2006.01) B05C 5/00 (2006.01) B05C 5/02 (2006.01) B05C 9/06 (2006.01)

Patent

CA 2187881

A die coating method and appara- tus includes a die (100, 150, 220) having an upstream bar (104, 154, 226) with an upstream lip, a central bar, a downstream bar (108, 158, 232) with a downstream lip, and a vacuum bar (110, 160, 224). The upstream lip is formed as a land and the first manifold bar is formed as a sharp edge. The shape of the land conforms to the shape of the surface being coated. Changing at least one of the slot heights H, the overbites O, and the convergence C, can improve coating performance. The die can have a slide surface (236, 244) and the coating fluid can exit the die from a pas- sageway and slides along the slide surface to form a continuous coating bead between the manifold bar sharp edge, the upstream die lip, and the surface being coated. The die can include several passageways for coating multiple layers.

L'invention concerne un procédé et un appareil d'enduction à filière. Ledit appareil comporte une filière (100, 150, 220) dotée d'une barre d'amont (104, 154, 226) à lèvre d'amont, d'une barre centrale, d'une barre d'aval (108, 158, 232) à lèvre d'aval, et d'un barre à vide (110, 160, 224). La lèvre d'amont présente la forme d'un listel, et la première barre collectrice d'un bord tranchant. Le listel est conçu pour épouser les contours de la surface en cours d'enduction. La modification d'au moins les hauteurs H des fentes, des surfaces de contact O, et de la convergence C peut améliorer l'efficacité de l'enduction. La filière peut présenter une surface glissante (236, 244), et le liquide d'enduction peut sortir de la filière par un passage et glisser le long de la surface glissante pour former une perle d'enduction continue entre le bord tranchant de la barre collectrice, la lèvre de filière d'amont, et la surface en cours d'enduction. La filière peut comporter plusieurs passages pour l'application de couches multiples.

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