Calender provided with an extended nip

Details Calender provided with an extended nip Calender provided with an extended nip

D - Textiles, Paper

21

G

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

Patent

CA 2274820

The invention concerns a calender provided with an extended nip for calendering of a paper or board web. The calender comprises at least one calendering nip (N), which is formed between a healable hard roll (1) and a calendering belt (10) which has been formed as an endless loop and which is loaded against the healable hard roll (1) by means of a backup roll (3) or a press shoe (24). The paper or board web (W) to be calendered is arranged to run through said calendering nip (N). According to the invention, in respect of at least a part of its thickness, the calendering belt (10) is made of a material of compressible volume. According to a second embodiment of the invention, the necessary resilience in the nip (N) is provided by means of a separate support belt, which runs underneath the calendering belt in relation to the web (W).

L'invention concerne une calandre possédant une pince allongée et destinée au calandrage d'une bande de papier ou de carton. La calandre comprend au moins une pince de calandrage (N) qui est formée entre un rouleau dur chauffant (1) et une courroie de calandrage (10). Cette dernière se présente comme une boucle sans fin, chargée contre le rouleau dur chauffant (1) au moyen d'un rouleau d'appui (3) ou d'un sabot de presse (24). La bande de papier ou de carton (W) qui doit subir le calandrage est disposée de manière à passer par ladite pince de calandrage (N). Selon cette invention, la courroie de calandrage est faite, au moins sur une partie de son épaisseur, avec du matériau à volume compressible. Dans un autre mode de réalisation, l'élasticité requise de la pince (N) est assurée par une courroie de support séparée. Par rapport à la bande (W), cette courroie passe au-dessous de la courroie de calandrage. .

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