Calender for treating a web of paper

Details Calender for treating a web of paper Calender for treating a web of paper

D - Textiles, Paper

21

G

D21G 1/00 (2006.01)

Patent

CA 2191274

A calender for treating a web of paper includes a stack of hard rollers and soft rollers. The stack includes a first set of processing nips and a second set of processing nips. Each processing nip is formed by a juncture of one of the hard rollers and one of the soft rollers. One side of the web of paper contacts against the hard rollers in the first set of processing nips and contacts against the soft rollers in the second set of processing nips. At least a last soft roller in the stack, which delimits a last processing nip that the web of paper passes through in the calender, has a lower surface roughness Ra than a surface roughness Ra of at least a first soft roller in the stack. The first soft roller delimits a first processing nip that the web of paper passes through in the calender. The surface roughness Ra of the last soft roller is less than 0.35 µm.

ne calandre pour le traitement d'une bande de papier en bout de machine est constituée de rouleaux durs et de rouleaux tendres. Elle comporte deux séries de pinces, chacune formée par la réunion d'un rouleau dur et d'un rouleau tendre. Une des faces de la bande de papier est comprimée contre les rouleaux durs pendant son passage dans la première série de pinces, et contre les rouleaux tendres, pendant son passage dans la deuxième série de pinces. Au moins un des derniers rouleaux tendres de la chaîne de calandrage, qui forme la dernière pince dans laquelle passe la bande de papier, présente une rugosité de surface Ra inférieure à celle Ra d'au moins un des premiers rouleaux tendres de la chaîne, le premier rouleau tendre délimitant la première pince à travers laquelle passe la bande de papier. La rugosité de surface Ra du dernier rouleau tendre est inférieure à 0,35 µm.

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