Method in film transfer coating and equipment intended for...

D - Textiles – Paper – 21 – H

Patent

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Details

D21H 23/56 (2006.01) B05C 1/08 (2006.01) B05C 11/06 (2006.01) B05D 1/28 (2006.01)

Patent

CA 2217681

The invention concerns a method in film transfer coating, in which the coating agent is applied as a film (F1, F2) onto the face of at least one of the rolls (12, 16) that form a film press nip (N), from which roll face the coating agent is transferred in the nip between the rolls (12, 16) onto the paper or board web (W') running through the nip. According to the invention, in the coating process, formation of coating-agent mist is prevented at the outlet side of the film press nip (N) so that steam jets are applied at least to the side of the web (W) that is being coated. The steam jets are passed favourably to the outlet side of the nip (N), and the steam jets are preferably passed substantially to the point of separation of the web (W') from the film press roll (12, 16). The invention also concerns an equipment intended for carrying out the method.

Procédé de revêtement par transfert de film, selon lequel l'agent de revêtement est appliqué sous la forme d'un film (F1, F2) sur la surface d'au moins l'un des rouleaux (12, 16) qui forment une zone de contact (N) où le film est comprimé. A partir de la surface de ce rouleau, l'agent de revêtement est transféré dans la zone de contact entre les rouleaux (12, 16) sur la bande de papier ou de carton (W') qui défile dans cette zone. Selon cette invention, au cours du processus de revêtement, la formation d'un brouillard constitué par l'agent de revêtement est empêchée du côté sortie de la zone de contact (N) de telle sorte que les jets de vapeur sont appliqués au moins du côté de la bande (W) qui subit le revêtement. Il est avantageux que les jets de vapeur passent du côté sortie de la zone de contact (N) et qu'ils passent de préférence sensiblement au point de séparation de la bande (W') du rouleau de compression (12, 16) du film. L'invention porte également sur l'installation permettant de mettre en oeuvre ce procédé.

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