REDUCING WAX CONTENT AND ENHANCING QUALITY OF RECYCLED PULP FROM OCC AND WASTE PAPER

摘要

A system and method for treating a waxed fiber paper product with a high wax content to remove a substantial portion of the wax content includes the pulping of the wax paper fiber at an elevated temperature in excess of the melting temperature of the wax to separate a pulp fraction and to form an emulsion of water and molten wax. The pulp fraction is separated from the emulsion by filtering in a reverse pressure screen (30) in which a finely perforated screen (45) defines a high pressure side and a low pressure side, and a major portion of the water/emulsion is removed from the suspension through the screen perforations (45) leading from the high pressure side to the low pressure side, in which a rotor and foil arrangement (50, 52) within the reverse screen (30) is operated under such conditions that the suspension at the high pressure side of the screen (30) is maintained in a constant fluidized condition.