Method of treating lignocellulosic or cellulosic pulp to promote

Details Method of treating lignocellulosic or cellulosic pulp to promote Method of treating lignocellulosic or cellulosic pulp to promote

1979-03-26

1980-10-14

Fisher, Richard V.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With chemical or physical modification of liberated fiber

162 53, 162 63, D21C 900

Patent

active

042279640

ABSTRACT:
The invention relates to a process comprising the saturation of a lignocellulosic or cellulosic pulp in gaseous ammonia. In one embodiment this is followed by subjection of the saturated pulp to vacuum. The treatment promotes the kinking of pulp fibres and/or improves the tearing strength of paper prepared therefrom.

REFERENCES:
patent: 3472731 (1969-10-01), Liebergott et al.
patent: 3617432 (1971-11-01), Clayton et al.
patent: 3622444 (1971-11-01), Andrews
patent: 3630828 (1971-12-01), Liebergott et al.
patent: 3652305 (1972-03-01), Noreus et al.
patent: 3707436 (1972-12-01), O'Connor
patent: 3740311 (1973-06-01), Liebergott et al.
patent: 3759783 (1973-09-01), Samuelson et al.
patent: 3832276 (1974-08-01), Roymoulik et al.
patent: 3951734 (1976-04-01), Deltaas et al.
patent: 4002526 (1977-01-01), Brown et al.
Osawa et al., "The Action of Gaseous Reagents on Cellulosic Materials, II" Tapp vol. 46, No. 2, Feb., 1963 pp. 162-165.
Casey; Pulp and Paper, (Second ed.); Interscience Publishers Inc., N.Y. (1960) text.
Bariska "Collapse Phenomena in Bleechwood During and After NH.sub.3 -Impregnation"; Wood & Science Technology, vol. 9 (1975) pp. 293-306.
Parham, Wood and Fiber; vol. 2 #4 (Winter 1971) pp. 311-320.
Parham et al.; "Radial-Tangential Shrinkage of Ammonia-Treated Lobbly Pine Wood" Wood Science vol. 4 No. 3 (Jan. 1972).
Arlov et al.; "Paper Extensibility", Pulp & Paper Int., 49, Jan. 1964.

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