Patents Assigned to SCA Graphic Research AB
  • Separation of solids from aqueous suspensions containing cellulosic fibers and fines
    Patent number: 6248207
    Abstract: Cellulosic fines and cellulosic fibers are separated from a suspension containing the fines, the fibers and hydrophobic materials by screening the suspension to remove the fibers, and then subjecting the resultant filtrate to dispersed air flotation in the presence of calcium and generally a separation aid to form an upper Reject fraction in which the hydrophobic material is concentrated and a lower Accept fraction in which the cellulosic fines are concentrated.
    Type: Grant
    Filed: May 13, 1999
    Date of Patent: June 19, 2001
    Assignees: CIBA Specialty Chemicals Water Treatment Limited, SCA Graphic Research AB
    Inventors: Paul Kenneth Cutts, Matthew James Green, Bo Gunnar Drehmer, Inger Viktoria Eriksson, Hans Olov Johansson