Process for increasing pulp whiteness by bleaching printed waste

Details Process for increasing pulp whiteness by bleaching printed waste Process for increasing pulp whiteness by bleaching printed waste

1997-04-11

1999-09-28

Nguyen, Dean T.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Waste paper or textile waste

162 56, D21C 502, D21B 132

Patent

active

059581794

ABSTRACT:
A process for increasing a degree of whiteness of paper pulp may include bring paper fiber pulp, which may at least partially include printed waste paper, into a suspension with water. The suspension may be mixed with bleaching aids and bleaching chemicals. The bleaching chemicals may preferably contain molecular oxygen. Intensely mechanically treating the pulp, e.g., at at least 20 kWh/to, prior to bleaching the pulp suspension. The bleaching period may take at least 10 minutes, with a pressure above the atmospheric pressure being exerted during the bleaching. After bleaching, a major portion of remaining color print particles may be removed from the bleached pulp.

REFERENCES:
patent: 4909900 (1990-03-01), Matzke et al.
patent: 5211809 (1993-05-01), Naddeo et al.
patent: 5518580 (1996-05-01), Ortner et al.
European Search Report and Annex.
Don McBride, "Separate Pulping . . . Benefits", Paper Recycling Strategies, Economics, and Technology, pp. 100-104, 1992.

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