D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 3/24 (2006.01) D21C 7/00 (2006.01) D21C 7/14 (2006.01)
Patent
CA 2149434
The present invention relates to a digester for continuous cooking under raised pressure and temperature of fibre material in a vertical digester (1), where input of fibre material and cooking liquid takes place at the top of the digester, withdrawal of spent cooking liquor is carried out from at least one digester screening arrangement (1D) between the top and the bottom of the digester, and fibre material is fed out from the bottom (1C) of the digester, and at least one screening arrangement (2) in the lower half of the digester, wherein at least one of said screening arrangements (1, 2) has at least one screen element (2A) of which the main configuration is of angular shape, preferably rectangular, most preferred square, having a screen face (3A) of which the total area is less than 1m2, and which is attached to the digester wall (1A) in a manner to form a sealed volume (V) from which liquid only can be supplied and withdrawn via said screen face (3A) and an inlet and outlet means (15) respectively which outlet means penetrates the digester wall (1A).
Backlund Ake
Oulie Finn
Svanberg Johanna
Fetherstonhaugh & Co.
Kvaerner Pulping Technologies Ab
Metso Fiber Karlstad Ab
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