Method and device for coating strips of material, in...

D - Textiles – Paper – 21 – H

Patent

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Details

D21H 23/32 (2006.01)

Patent

CA 2198264

The prior art includes methods and devices for coating webs of paper or cardboard (2) in which an excess of coating material is first applied to the web (2) by an applicator (1) and the excess subsequently wiped off by a dosaging device (9). The invention calls for the web (2) to be guided so that, over at least part of the distance between application and wiping off of the coating material, the web travels along a concave path with its axis of curvature running parallel to the web (2) and perpendicular to the direction of travel of the web on the coated side of the web at a certain distance from this coated side. This ensures that, at very high web speeds, the coating is applied uniformly.

Pour l'enduction de bandes de papier ou de carton (2) il existe des procédés et des dispositifs connu selon ces procédés, le matériau d'enduction est appliqué en quantités excédentaires sur la bande (2) au moyen d'un système d'application (1), l'excédent de matériau d'enduction étant ensuite éliminé par raclage, au moyen d'un élément de dosage (9). Selon l'invention, la bande de matériau (2) est guidée courbée, de manière concave, entre la zone d'application et la zone de raclage, au moins sur une section partielle, de manière à ce que l'axe de courbure soit parallèle à la bande de matériau (2) et transversale au sens de progression de la bande, du côté de l'enduction et à une certaine distance de celle-ci. Ce système permet d'obtenir une enduction uniforme, même pour des bandes qui circulent à des vitesses élevées.

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