Method and arrangement for coating a moving web

D - Textiles – Paper – 21 – H

Patent

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Details

D21H 23/52 (2006.01) B05C 1/08 (2006.01) D21H 23/70 (2006.01)

Patent

CA 2329749

Method and arrangement for coating a paper or board web, wherein the web (1) to be coated is brought to a film transfer coater and taken to a nip (12) between the film transfer roll (3) of the coater and its backing roll (4), and coating mix is applied onto the surface of the film transfer roll (3). The web (1) is taken through the nip (12) between the rolls (3, 4) and the rolls (3, 4) are turned whereby the coating mix applied onto the applicator roll (3) is at least partly transferred onto the surface of the web (1). According to the invention the web (1) is supported through the nip (12) by means of a belt (2) travelling at the same speed as the web, the belt having been arranged to travel round the backing roll (4). The web (1) is taken onto the surface of the belt (2) prior to the nip (12) and separated from the belt (2) after the nip, and it is pressed against the film transfer roll (3) by means of the belt (2) and the length of the path covered in contact with each other by the web (1) and the film transfer roll (3) is controlled by varying the position of the web (1) and the belt (2).

Dans le cadre de ce procédé de couchage d'une bande de papier ou de carton, la bande (1) à enduire est amenée à une coucheuse par transfert de film et prise par une pince (12) entre le rouleau de couchage par transfert de film (3) de la coucheuse et son contre-rouleau (4), puis un mélange de couchage est déposé sur le rouleau de couchage par transfert de film (3). La bande (1) est maintenue par la pince (12) entre les rouleaux (3, 4) qui entrent en rotation afin que le mélange de couchage préalablement déposé sur le rouleau applicateur (3) soit au moins en partie transféré vers la surface de la bande (1). Dans le cadre de ce procédé, la pince (12) retient la bande par le biais d'une courroie (2) se déplaçant à la même vitesse que la bande et conçue pour tourner autour du contre-rouleau (4). La bande (1), qui porte sur la surface de la courroie avant d'être prise par la pince (12), est retirée de la courroie (2) après l'enlèvement de la pince. La bande est appuyée contre le rouleau de couchage par transfert de film (3) par la courroie (2) et l'on commande la longueur du trajet que court la bande (1) en restant en contact avec le rouleau de couchage par transfert de film (3) en modifiant la position de la bande (1) et de la courroie (2).

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