Press section with separate press nips in a paper machine

Details Press section with separate press nips in a paper machine Press section with separate press nips in a paper machine

D - Textiles, Paper

21

F

92/15.3

D21F 3/00 (2006.01) D21F 3/02 (2006.01) D21F 3/04 (2006.01)

Patent

CA 1268649

ABSTRACT OF THE DISCLOSURE A press section of a paper machine includes, in the direction of web run, at least three successive, separate press nips for dewatering a web, the web passing between the nips in a closed draw. The web is dewatered in the first nip through both of its faces. The press section includes at least one upper fabric and lower fabrics, the first fabrics in the direction of web run being water-receiving fabrics arranged such that one of the first fabrics acts as a press fabric in the first nip while the other of the first fabrics acts as a press fabric both in the first as well as in the second nip. Of the second fabrics in the direction of web run, the upper fabric is a water-receiving press fabric while the second lower fabric is a substantially non- water-receiving transfer fabric or belt on which the web is transferred from the third press nip to the following drying section as a closed draw. The third separate press nip comprises an extended nip press, the length of the nip zone thereof being substantially larger than the lengths of the zones of the preceding roll nips. the web runs through the nip zone of the extended-nip press supported on its bottom side by the substantially non-water-receiving transfer fabric, the upper water-receiving fabric being pressed against the other side of the web.

482222

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