Calender for the treatment of a paper web and process for...

D - Textiles – Paper – 21 – G

Patent

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

Patent

CA 2169977

A calender for treating a paper web includes a roller stack being loaded with a load on one end. The calendar has at least two hard rollers each having a substantially smooth outer surface. The at least two hard rollers each have a device for heating a surface of the roller to a temperature of at least 100°C. The calendar also includes at least two soft rollers, wherein each of the at least two soft rollers is disposed adjacent to at least one of the at least two hard rollers to form a working nip therebetween. At least one working nip has a dwell time of the paper web passing through the working nip of at least 0.1 ms. The load on the rollers produces an average compressive stress in the at least one working nip of at least 42 N/mm. An arithmetic mean of the numerical value of the surface temperature T, the dwell time t and the compressive stress p in all of the working nips satisfies the following relationship: a target value Zg = 1.378-0.00356T-(0.00825-5.1210-5T)p-[0.039+(0.188- 0.00112T)pe-0.093p]te-0.42lt = 0.8 to 0.9.

Calandre destinée au traitement d'une bande de papier et constituée de rouleaux superposés ayant une charge à une extrémité. La calandre comprend au moins deux rouleaux durs présentant chacun une surface extérieure essentiellement lisse. Au moins ces deux rouleaux durs sont pourvus d'un dispositif chauffant une de leurs surfaces à une température d'au moins 100 degrés C. La calandre comprend aussi au moins deux rouleaux tendres. Au moins ces deux rouleaux tendres sont disposés de façon contiguë à au moins un des deux rouleaux durs pour former une pince de travail entre eux. Au moins une pince de travail a un temps de passage de la bande de papier dans la pince de travail d'au moins 0,1 ms. La charge sur les rouleaux produit une contrainte de compression moyenne d'au moins 42 N/mm~ dans la pince de travail. Une moyenne arithmétique de la valeur numérique de la température T de surface, le temps de passage t et la contrainte de compression p dans toutes les pinces de travail correspondent à la relation suivante : une valeur cible Zg = 1.378-0.00356~T-(0.00825-5.12~10-5T)p-[0.039+(0.188-0.00112T)p~e-0.093p t~e-0.42lt = 0.8 à 0.9.

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