Wire section and method of dewatering a fiber web in a wire sect

Details Wire section and method of dewatering a fiber web in a wire sect Wire section and method of dewatering a fiber web in a wire sect

1997-09-11

2000-02-22

Fortuna, Jose

Paper making and fiber liberation

Processes and products

Running or indefinite length work forming and/or treating...

162203, 162308, 162334, 162364, 162301, D21F 100, D21F 1100

Patent

active

060276126

ABSTRACT:
The invention concerns the wire section of a papermaking machine and a method of removing water from a fiber web in that section. A fiber suspension is discharged from a headbox on at least one and usually between two wires in the forming section. The fiber suspension is dewatered until it eventually reaches the point of immobility at which the fiber orientation is fixed. The rate of removal of water transverse to the direction of travel of the web is controlled at regions across the web. In particular, the rate of water removal is decreased at the edge regions of the wire and the web, as compared with the center region, to improve the transverse formation profile of the web. Various techniques for controlling the rate of water removal are disclosed including using different mesh of the wire at the edge regions and at the center region, a suction forming roll applying different levels of suction at different zones across the wire and the web, and adjustable ledges engaging one of the two wires and being adapted or adjusted to apply different pressure levels to the wire across the web.

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Holik, H., Blattbildung --Grundlage fur Papierqualitat. In: Wochenblatt fur Papierfabrikationen, Nov. 12, 1992, S. 443, 444, 446, 448, 450-453.

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