Digester for cooking pulp having staggered screens
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United States of America Patent
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-
Nov 28, 1995
Grant Date -
N/A
app pub date -
Jul 16, 1993
filing date -
Nov 18, 1992
priority date (Note) -
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status (Latency Note)
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Abstract
In a pulp digester for continuous cooking under raised pressure and temperature of fiber material in a vertical digester (1), input of fiber 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 fiber 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 1 m.sup.2, 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attached to the digester wall (1A) in a manner to form a sealed volume (V) from which liquid only can be supplied and withdrawn via said screen face (3A) and an inlet and outlet (15) respectively which outlet penetrates the digester wall (1A).
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