Method and arrangement for producing calendered paper or board

Details Method and arrangement for producing calendered paper or board Method and arrangement for producing calendered paper or board

D - Textiles, Paper

21

G

D21G 1/00 (2006.01) D21F 1/08 (2006.01) D21G 9/00 (2006.01) D21H 23/24 (2006.01) D21H 25/04 (2006.01)

Patent

CA 2372918

A method and an arrangement for manufacturing calendered paper or board particularly in the on-line manufacturing method. In the method, a base web is formed from a mixture of water and pulp supplied from the headbox and the web is dried by removing water over the press section and over the dryer section by heating. The formed web is calendered at least once to modify the surface on at least one of its sides. Before calendering the cross- direction thickness profile of the web is standardized and calendering is carried out by means of a long-nip calender, whereby good surface quality is obtained without losing the bulk or stiffness of the web.

Cette invention concerne un procédé et un dispositif permettant de produire du papier ou du carton calandré en particulier dans un procédé de production en ligne. Dans ce procédé, une bande de base est constituée à partir d'un mélange d'eau et de pâte à papier provenant du caisson de distribution, puis séchée par élimination de l'eau dans la partie presse et par chauffage dans la partie séchoir. La bande ainsi formée est calandrée au moins une fois afin de la modifier sur au moins une de ses faces. Avant le calandrage, le profil d'épaisseur transversal de la bande est standardisé et le calandrage est réalisé au moyen d'une calandre à longue pince, ce qui permet d'obtenir une bonne qualité de surface, sans que la bande ne perde du volume ou de la rigidité.

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