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1. WO2020069733 - MÉTHODE DE TRAITEMENT D'ACIER GALVANISÉ OU RECUIT PAR GALVANISATION

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

CLAIMS

1. A method of treating a substrate, comprising:

providing an applicator roll (2,3) contacting the substrate (5) which travels at a certain line speed;

supplying a coating liquid (10) to the applicator roll (2,3) and thereby to the substrate (5),

applying the coating liquid (10) as a substantially uniform layer of liquid coating (10) onto the substrate (5),

wherein a contact angle Q is defined as the angle, measured -in a static situation- through the coating liquid, where the liquid-vapour interface of the coating liquid meets the solid surface of the applicator roll;

characterized by

providing that the substrate (5) is a metal strip (5’);

providing that -in forward coating mode or in reverse coating mode- the absolute value of the tangential speed of a surface area of the applicator roll (2, 3) contacting the substrate (5) substantially matches that of the line speed of the substrate (5);

providing that the contact angle Q is 97° or smaller.

2. Method according to claim 1 , characterized by providing that the contact angle Q is 93° or smaller.

3. Method according to claim 1 or 2, characterized by providing that the contact angle Q is 80° or smaller.

4. Method according to any one of the previous claims, characterized by providing that at least one applicator roll (2, 3) has a polymer cover, wherein the tangential speed of the surface area of the applicator roll (2, 3) differs 30 % or less, preferably 20 % or less, and most preferably 10 % or less up or down with respect to the line speed of the substrate (5).

5. Method according to any one of the previous claims, wherein the method is used in forward coating mode, characterized by providing that at least one applicator roll (2, 3) has a polymer cover and that the coating liquid (10) is applied to the substrate (5) as a thin wet film having a thickness of 4 pm or less, preferably 3 pm or less.

6. Method according to any one of the previous claims, wherein the method is used in reverse coating mode, characterized by providing that at least one applicator roll (2, 3) has a polymer cover and that the coating liquid (10) is applied to the substrate (5) as a thin wet film of less than 8 pm, preferably less than 6 pm, more preferably less than 4 pm.

7. Method according to any one of the previous claims, wherein the metal substrate is coated, preferably zinc based coated, e.g. is a galvanised or galvannealed steel substrate.