Method for reducing alkaline darkening of mechanical pulp...

Details Method for reducing alkaline darkening of mechanical pulp... Method for reducing alkaline darkening of mechanical pulp...

2006-02-14

2006-02-14

Walls, Dionne A. (Department: 1731)

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Treatment with particular chemical

C162S181100, C162S181200

Reexamination Certificate

active

06998015

ABSTRACT:
A method is disclosed for reducing or inhibiting alkaline darkening of mechanical pulp caused by the presence of calcium carbonate filler during production; the method comprises adding a sulfite, or sulfur-containing reducing agent, especially a sulfite to the mechanical pulp and the filler; the method is usefully applied in the production of mechanical pulp and paper in which calcium carbonate is used as a filler and also in the production of paper at neutral or mildly alkaline conditions.

REFERENCES:
patent: 2173167 (1939-09-01), Hovey
patent: 2173687 (1939-09-01), Hovey
patent: 4183146 (1980-01-01), Tsukamoto et al.
patent: 4427490 (1984-01-01), Eckert
patent: H1690 (1997-11-01), Nye
patent: 5882476 (1999-03-01), Evans et al.
patent: 0 608 687 (1994-07-01), None
patent: 96/20308 (1996-07-01), None

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