Patent ID: 7311848
Filing Date: 2007-12-25
Classification: B01D,B04B,G01N

Abstract:
1. A method of monitoring a papermaking process comprising; withdrawing a liquid fluid mixture from a pulp suspension comprising fibrous and filler materials and colloidal substances; pressurising and supplying the liquid fluid mixture to a separation apparatus, said separation apparatus comprising at least two rotatable discs defining at least one space between the discs, means for withdrawing a dense fraction of the liquid fluid mixture from the perimeter of the discs, said discs being arranged to a rotatable axis defining within it at least one bore fluidly communicating with said at least one space, said at least one bore having at least one outlet for removing a light fraction of the liquid fluid mixture; subjecting the supplied pressurised liquid fluid mixture to centrifugal forces at said at least one space by rotating said at least two rotatable discs, such that a light fraction of the liquid fluid mixture is pressed to said at least one bore for withdrawal thereof, and a dense fraction of the liquid fluid mixture is pressed to the perimeter of the discs for withdrawal thereof; guiding said withdrawn light fraction to an analyser for characterisation thereof or at least one component therein to monitor a papermaking process.