Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Continuous chemical treatment or continuous charging or...
Reexamination Certificate
2007-10-23
2007-10-23
Halpern, Mark (Department: 1731)
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Continuous chemical treatment or continuous charging or...
C162S037000, C162S041000, C162S052000, C162S059000, C162S151000, C162S237000, C162S239000, C162S246000
Reexamination Certificate
active
10471431
ABSTRACT:
The continuous digester is for producing chemical pulp to a process for operating this digester and to a feedback system for the cooking liquid. By means of implementing cooking zones 1st, 2nd, 3rd, 4th and 5th down through the digester, that have a successively decreasing liquid-to-wood ratio, it is possible to obtain a more uniform alkali profile during the cooking. The alkali is kept high at the beginning by means of a high liquid-to-wood ratio, typically over 6:1, which exceeds conventional liquid-to-wood ratios, which are normally around 3.5-5.0:1.
REFERENCES:
patent: 4193839 (1980-03-01), Sherman
patent: 5080755 (1992-01-01), Backlund et al.
patent: 5256255 (1993-10-01), Fagerlund
patent: 6063238 (2000-05-01), Bergqvist et al.
Lindstrom Mikael
Snekkenes Vidar
Fasth Rolf
Fasth Law Offices
Halpern Mark
Metso Fiber Karlstad AB
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