Patents Assigned to Voith Sultzer Paper Technology North America, Inc.
  • Method of removing wax from cellulosic fiber used in a fiber suspension for a paper-making machine
    Patent number: 6228212
    Abstract: The invention comprises, in one form thereof, a method of removing wax from recycled cellulosic fiber. The cellulosic fiber is pulped in a pulper to a suspension with a consistency of less than about 10% by weight. The suspension is then screened to remove coarse and fine contaminants. The screened suspension is diluted to a consistency of less than about 3% by weight. The wax is removed from the diluted suspension using a froth flotation device. The suspension is then washed and/or thickened.
    Type: Grant
    Filed: April 19, 1999
    Date of Patent: May 8, 2001
    Assignee: Voith Sultzer Paper Technology North America, Inc.
    Inventors: Oliver U. Heise, Bangij Cao