Patents Assigned to AGA Aktienbolag
  • Method of pre-treating secondary fibers with oxygen in a disperser
    Patent number: 5997689
    Abstract: A method of bleaching secondary fibers. A secondary fiber pulp is first slushed and then transferred at a consistency of 20-40% to a disperser. In the disperser, the secondary fiber pulp is mechanically treated and mixed so that ink particles in the secondary fiber pulp are dispersed throughout the secondary fiber pulp. While the secondary fiber pulp is being treated and mixed in the disperser, oxygen is delivered to the disperser so as to distribute the oxygen within the secondary fiber pulp.
    Type: Grant
    Filed: July 3, 1997
    Date of Patent: December 7, 1999
    Assignee: AGA Aktienbolag
    Inventor: Monica Bokstrom