Method of bleaching de-inked pulp and removing the ink particles

Details Method of bleaching de-inked pulp and removing the ink particles Method of bleaching de-inked pulp and removing the ink particles

1993-04-13

1995-02-21

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Waste paper or textile waste

162 7, 162 8, 162 68, 162 80, D21C 502, D21C 910

Patent

active

053912616

ABSTRACT:
Deinked paper pulp is subjected to bleaching with sulfite or bisulfite ions and a reducing agent, preferably sodium bisulfite and sodium borohydride in aqueous alkaline solution. To assist the removal of ink particles, steam is bubbled through the pulp causing the ink particles to rise to the surface as a black foam which can be continuously removed.

REFERENCES:
Database WPIL, Section Ch, Week 9245, Derwent Publications Ltd., London, GB; Class F09, AN 92-370369, Sep. 1992.
Abstract Bulletin of the Institute of Paper Chemistry, vol. 48, No. 4, Oct. 1977, Appleton US, p. 466.

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