Patent ID: 6027612
Filing Date: 2000-02-22
Classification: D21F

Abstract:
A method of removing water from a fiber suspension and for controlling a transverse profile of the fibers in the suspension in a forming section of a paper machine, the fibers within the suspension being capable of changing their orientations until the suspension is dewatered to a point of immobility when the orientation of the fibers do not change, the method comprising the steps of:supplying the fiber suspension onto at least one wire of the forming section of the paper machine;exposing the fiber suspension of the web to: (i) a level of suction at its center; and (ii) respective levels of suction at its lateral edges in a manner for dewatering the fiber suspension through the wire; andcontrolling the rate of removal of water from the fiber suspension at edges of the web as compared with a center region of the web prior to the point of immobility of the fibers in the suspension by providing a different level of suction at the edge regions than at the center region of the web.