Patent ID: 6651679
Filing Date: 2003-11-25
Classification: D21B,Y02W

Abstract:
A process for disintegration and cleaning of contaminant-containing raw paper stocks, the process comprising:producing a contaminant-containing suspension; feeding the contaminant-containing suspension to a closed coarse screen; drawing of a cleaned flow fraction from the closed coarse screen; drawing off an overflow fraction containing an increased amount of contaminants from the coarse screen during at least about 80% of an operating time; adjusting a volumetric mass flow of the overflow fraction to at least about 15% and maximally 50% of a volumetric mass flow of an inflow into the coarse screen; and feeding the overflow fraction to a screening device, in which contaminants collected are sluiced out discontinuously as a further overflow fraction, thereby forming a further cleaned flow fraction.