Method and apparatus of coating a moving substrate surface

B - Operations – Transporting – 05 – D

Patent

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B05D 1/40 (2006.01)

Patent

CA 2393284

A method of providing a paint coat of an organic polymeric paint composition (7) on a surface of a moving substrate (4), comprises establishing a quantity (6) of the paint composition, in a high solids form at a temperature such that it is spreadable, in a nip defined by the substrate surface and a smoothing roll (3) to enable paint from the established quantity to pass through the nip as a paint layer on the substrate surface, wherein the smoothing roll has a surface roughness coefficient (Ra) of no more than 1.5, and wherein the maximum surface speed of the smoothing roll expressed as a percentage of the substrate speed bears a linear relationship to the substrate speed, such that the surface speed of the smoothing roll is no more than 1.2 percent of the substrate speed at an exemplary low substrate speed of 15 metres per minute and no more than 12 percent of the substrate speed at an exemplary substrate speed of 150 metres per minute.

L'invention concerne un procédé de revêtement de peinture à base de composition de peinture polymère organique (4), qui consiste à établir une quantité (6) de composition, sous une forme à haut extrait sec, à une température permettant l'étalement, dans l'espace de contact défini par la surface du substrat et un rouleau lisseur (3), afin d'appliquer la peinture de la quantité établie via cet espace de contact, donnant ainsi une couche à la surface du substrat. Le rouleau lisseur a un coefficient de rugosité de surface (Ra) ne dépassant pas 1,5, sachant que la vitesse de surface maximum du rouleau lisseur, exprimée en pourcentage par rapport à la vitesse du substrat, présente une relation linéaire vis-à-vis de la vitesse du substrat, de sorte que la vitesse de surface du rouleau lisseur ne dépasse pas 1,2 % de la vitesse du substrat, par exemple pour une vitesse du substrat de 15 m/min, et ne dépasse pas 12 % de cette vitesse, par exemple pour un vitesse du substrat de 150 m/min.

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