Method and device for coating a continuous strip of...

D - Textiles – Paper – 21 – H

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D21H 25/08 (2006.01) B05C 11/04 (2006.01) D21H 23/34 (2006.01) D21H 23/78 (2006.01)

Patent

CA 2255656

The invention relates to a method and a device for coating a continuous strip of material (B), specially paper or cardboard, with a liquid or paste-like application medium. Said pre-dosed application medium is applied (at 240) directly or indirectly to the material strip (B), whereupon final dosing according to the desired weight of application and/or equalization (at 255) is carried out. Final dosing and/or equalization occurs only after a minimum time period (tmin) starting from pre-dosing in order to guarantee the formation of a coating of immobilized solids on the material surface in the application medium. Additionally or alternately, the immobilization of solids can be actively accelerated (by 278, 280, 282, 284). Another aspect of the invention provides for final dosing only after a maximum time period (tmax).

L'invention concerne un procédé et un dispositif pour le couchage d'une bande (B) continue, en particulier en papier ou en carton, avec un produit d'application pâteux ou liquide. Le produit d'application est appliqué directement ou indirectement après dosage préalable sur la bande de papier ou de carton (B) (en 240), puis fait l'objet d'un dosage final ou d'une égalisation afin d'atteindre le grammage de couche désiré (en 255). Le dosage final ou l'égalisation n'ont lieu au plus tôt qu'après l'écoulement d'un temps minimal t¿min? après le dosage préalable, afin de garantir la formation d'une couche de substances solides immobilisées à la surface de la bande, dans le produit d'application. Il est possible en plus ou en variante d'accélérer activement l'immobilisation des substances solides (par 278, 280, 282, 284). Selon une autre perspective de l'invention, le dosage final a lieu au plus tard après un temps maximal t¿max?.

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