Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Continuous chemical treatment or continuous charging or...
Patent
1992-04-21
1993-07-13
Jones, W. Gary
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Continuous chemical treatment or continuous charging or...
162 25, 162 28, 162 57, 162 60, D21C 326
Patent
active
052270211
ABSTRACT:
A method of defiberizing fibrous cellulosic material bound by chemical bonds and physical force comprising treating the fibrous cellulosic material in a treatment apparatus so as to loosen the chemical bonds between the fibers but to leave the bonds caused by physical force essentiall undisburbed to generate treated fiber accumulations and removing a stream of the treated fiber accumulations from said treatment apparatus and defiberting the treated fiber accumulations by subjecting the material to shear forces in the stream, the shear forces being of sufficient strenth to substantiallyl break the physical forces keeping the fibers together and to separate the fibers. The method of which is performed by step (1) introducing the fibrous material in the form of wood chips into a digester and by chemically treating the wood chips in the digester at a pressure and cooking temperature beyond the difiberation point of the fibrous material so as to soften the wood chips and to loosen the fibers; step (2) removing a tream of the treated wood chips from the digester and step (3) by defiberizing the treated wood chips by generating shear forces in the stream, the shear forces being of sufficient strength to substantially separate the fibers and by subjecting the wood chips to the shear forces.
REFERENCES:
patent: 4002528 (1977-01-01), Laakso
patent: 4560437 (1985-12-01), Kleppe et al.
patent: 4619736 (1986-10-01), Henricson et al.
patent: 4737274 (1988-04-01), Jacobsen et al.
patent: 4971658 (1990-11-01), Henricson et al.
Hernesniemi Lasse
Olavi Pikka
A. Ahlstrom Corporation
Jones W. Gary
Nguyen Dean Tan
Wisaforest Oy Ab
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