D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
92/21, 100/26
D21F 3/00 (2006.01) D21F 3/04 (2006.01)
Patent
CA 2017010
The invention concerns a press section of a paper or paperboard making machine, comprising a number of rolls (1, 11, 22, 32, 44, 70) which forms press nips (N1, N2, N3, N4) that dewater the web (W) with each other, the web being arranged to run through these nips. Of the rolls at least one roll (1;70) is a smooth-faced so-called center roll, which forms a press nip (N2, N3;N4) with at least one other press roll (11, 32, 44), over which a press felt (10, 30; 40), which has been formed as an endless loop, is passed to absorb water from the web (W). The center roll (1; 70) in accordance with the invention is a variable-crown roll, which comprises a metallic roll mantle (2; 71) arranged to revolve around a stationary roll axle (3; 72). The roll includes at least one set of crown-variation members (4, 5; 73), which are arranged to load the roll mantle (2; 71) in the direction of the nip plane (K2, K3; K4) of the center roll (1; 70) and the roll (11, 32; 44) that forms a press nip N2, N3; N4) with the center roll so as to regulate the linear load profile in the nip (N2, N3; N4).
Marks & Clerk
Valmet Paper Machinery Inc.
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