Method in the calendering of a paper or of an equivalent web...

Details Method in the calendering of a paper or of an equivalent web... Method in the calendering of a paper or of an equivalent web...

D - Textiles, Paper

21

G

D21G 1/00 (2006.01)

Patent

CA 2365775

The invention concerns a calender for the calendering of a paper or of an equivalent web material. The calender comprises a frame (11,11a), a variable-crown upper roll (13,13a), a variable-crown lower roll (14,14a) and two or more intermediate rolls (15...22,15a...22a) fitted between the upper (13,13a) and lower (14,14a) rolls. The upper, lower and intermediate rolls are arranged on the frame (11,11a) of the calender as a stack of rolls (12,12a) and being in nip contact with one another to form calendering nips (N1...N9) between the rolls. Hard- and soft-faced rolls are used as the intermediate rolls in which the form of the natural deflection line produced by their own gravity is substantially equal. The nip loads produced by the masses of the intermediate rolls and of the auxiliary equipment related to them are relieved and at least one of the intermediate rolls (15...22,15a...22a) is a cooled roll which is provided with a resilient polymer coating.

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