Belt, method and apparatus for dewatering web in press nip

Details Belt, method and apparatus for dewatering web in press nip Belt, method and apparatus for dewatering web in press nip

D - Textiles, Paper

21

F

D21F 7/08 (2006.01) D21F 1/00 (2006.01) D21F 3/00 (2006.01) D21F 3/02 (2006.01)

Patent

CA 2243597

An endless belt for use in dewatering of a paper web or sheet is described. The belt has a first surface, an opposite second surface, and a body portion. The body portion is permeable to pressurized gas and substantially impermeable to liquid. The body portion has a first portion adjacent the first surface and a second portion adjacent the second surface. The first portion has a number of air cavities adjacent and exposed to the first surface. The second portion has a number of passageways each of which is dimensioned to be permeable to pressurized gas and substantially impermeable to liquid. Each passageway extends from the second surface to a select one of the air cavities. The belt is used in a press section of a papermaking machine and has the advantage of allowing pressurized gas through the belt into the paper web or sheet while at the same time not acting as a receptor for water expressed in a press nip of the press section.

L'invention concerne une courroie (30) pour une section de presses, comprenant une partie corps (42) perméable à l'air sous pression amené dans la ligne de contact (6) entre deux rouleaux d'une presse, et pratiquement imperméable au liquide pendant le passage de la bande à travers la ligne de contact entre les deux rouleaux. L'invention concerne également une section de presses et un procédé ayant recours à une telle courroie.

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