Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Continuous chemical treatment or continuous charging or...
Reexamination Certificate
2008-04-01
2008-04-01
Fortuna, José A. (Department: 1791)
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Continuous chemical treatment or continuous charging or...
C162S030100, C162S042000
Reexamination Certificate
active
07351306
ABSTRACT:
The method is for cooking of cellulose pulp in which the raw material, preferably in the form of chips, undergoes a successive elevation of temperature towards the cooking temperature while the chips are first impregnated with an impregnation liquor followed by cooking in a cooking liquor that is preferably alkali. Through the addition of pre-evaporated black liquor, either as early as the impregnation stage or during the subsequent cooking stage, an improved delignification process is achieved in which the pulp obtains improved properties, primarily with respect to strength/viscosity for a given degree of delignification, and also with respect to yield. The method can be used both for continuous cooking and for batch cooking of cellulose pulp.
REFERENCES:
patent: 2747552 (1956-05-01), Kyrklund
patent: 3258390 (1966-06-01), Tomlinson, II
patent: 3303088 (1967-02-01), Gessner
patent: 3414038 (1968-12-01), Laakso
patent: 3525666 (1970-08-01), Brannland
patent: 4944840 (1990-07-01), Henricson et al.
patent: 5080755 (1992-01-01), Backlund
patent: 5480512 (1996-01-01), Sannholm
patent: 5643410 (1997-07-01), Hiljanen et al.
patent: 5885414 (1999-03-01), Lindstrom et al.
patent: 6346166 (2002-02-01), Kettunen et al.
patent: 6468390 (2002-10-01), Snekkenes et al.
patent: 7214291 (2007-05-01), Gustavsson et al.
patent: 7270725 (2007-09-01), Lindstrom et al.
patent: 2001/0032711 (2001-10-01), Stromberg et al.
patent: 2004/0079498 (2004-04-01), Haaslahti et al.
patent: 2005/0103454 (2005-05-01), Lindstrom et al.
patent: 2005/0115691 (2005-06-01), Lindstrom et al.
patent: 2005/0161177 (2005-07-01), Gustavsson et al.
patent: 2005/0252625 (2005-11-01), Lindstrom et al.
patent: 2006/0070710 (2006-04-01), Hernesniemi et al.
patent: 2007/0131363 (2007-06-01), Kettunen et al.
patent: 2584433 (1987-01-01), None
patent: 2005515319 (2005-05-01), None
Sven A. Rydholm, Pulping Processes, 1967, Interscience Publishers, pp. 769 & 774.
Lindstrom Mikael
Snekkenes Vidar
Fasth Rolf
Fasth Law Office
Fortuna Jos'e A.
Metso Fiber Karlstad AB
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