Calendering method and a calender that makes use of the method

Details Calendering method and a calender that makes use of the method Calendering method and a calender that makes use of the method

D - Textiles, Paper

21

G

D21G 1/00 (2006.01) D21G 1/02 (2006.01)

Patent

CA 2285301

The invention concerns a calendering method, in which the paper or board web (W) is passed through the calender, in which calender the calendering nip (N) is formed between a heatable hard roll (11) and an endless, flexible and substantially non-compressible calendering belt (15) passed over said roll. The heatable hard roll (11) is heated in order to plasticize the surface layer of the web (W) to be calendered placed at the side of the heatable roll, and the web (W) is brought into a preliminary contact with the heatable roll (11) before the calendering proper of the web (W). After the stage of preliminary contact (I), the press treatment proper is applied to the web (W) to be calendered in two stages. First a deformation is produced in the material web (W) in the press stage (II), after that the deformation that was produced in the press stage (II) is allowed to be reversed partially under control in a reversing stage (III), and a new deformation is produced in the material web (W), which was already once pressed and partly reversed, by pressing the web again in a finishing press stage (IV). After the finishing press stage (IV), the calendered web is supported by means of the calendering belt (15) over a certain distance before the web (W) is passed away from between the heatable hard roll (11) and the calendering belt (15).

L'invention concerne un procédé de calandrage, selon lequel la bande de papier ou de carton (W) traverse la calandre. Celle-ci présente une pince de calandrage (N) formée entre un rouleau dur (11) pouvant être chauffé et une courroie (15) de calandrage sans fin, flexible et sensiblement non compressible, passant au-dessus dudit rouleau. Le rouleau dur (11) est chauffé de façon à ramollir la couche superficielle de la bande (W) destinée à être calandrée, placée sur le côté dudit rouleau, et la bande (W) est amenée en contact préliminaire avec le rouleau (11) avant son calandrage proprement dit. Après l'étape de contact préliminaire (I), le traitement par presse proprement dit est appliqué en deux étapes à la bande (W) destinée à être calandrée. On produit une déformation dans la bande de matériau (W) à l'étape de presse (II); on laisse la déformation produite à l'étape de presse (II) s'inverser partiellement, de manière contrôlée, à une étape d'inversion (III); puis on produit une nouvelle déformation dans la bande de matériau (W), déjà pressée et inversée, en pressant de nouveau la bande à une étape terminale de finition (IV). Après l'étape de finition (IV), la bande calandrée est supportée sur une certaine distance par une courroie de calandrage (15) avant de passer entre le rouleau dur pouvant être chauffé (11) et la courroie de calandrage (15).

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