Method of treating bleached pulp on a washer with calcium ions t

Details Method of treating bleached pulp on a washer with calcium ions t Method of treating bleached pulp on a washer with calcium ions t

1992-03-02

1993-12-28

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With washing

162 87, 1621812, D21C 902

Patent

active

052736253

ABSTRACT:
Method for treating chemically treated cellulosic pulp that contains sodium ions wherein the pulp is subjected to an ion exchange with a cation (preferably calcium) having a higher valence than the sodium followed by washing of the sodium cations from the pulp and then forming the pulp containing the cations in an amount equivalent to at least 700 ppm of calcium ions into a sheet thereby to facilitate water removal and increase the production rate of the sheet forming machine.

REFERENCES:
patent: 3029181 (1962-04-01), Thomsen
patent: 3567574 (1971-03-01), Braitberg et al.
patent: 3897301 (1975-07-01), Bauman et al.
"Panorama of Papermaking Today", Westvaco Chart, Westvaco Corp. 1971.
Trinh et al, "Sodium Equilibrium In Kraft Pulp Washing", J. of Pulp & Paper Science, vol. 13, No. 3; May 1987, pp. 93-98.
Crotogino et al, "The Principles of Pulp Washing", Tappi J., Jun. 1987, pp. 95-103 (162-60).

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