Patent ID: 6302996
Filing Date: 2001-10-16
Classification: D21C,D21D,D21F

Abstract:
A method of washing a fiber pulp mixture having a substantially constant consistency, said method comprising:feeding the fiber pulp mixture at a substantially constant volumetric input flow between two filter wires running in the same direction;advancing the filter wires into a closed dewatering space which converges in the direction of travel of the wires;advancing the filter wires past at least one surface equipped with dewatering holes so that water is removed from the fiber pulp mixture through the wires and the surfaces;advancing the filter wires supporting the washed fiber pulp mixture through a slice at an output end of the dewatering space; andadjusting the thickness of the fiber pulp layer in terms of pulp weight per surface area ratio when the fiber pulp mixture is between the filter wires such that the ash and fines content of the washed fiber pulp can be adjusted to desired values.