Digester having screening arrangement for isothermal cooking of fibrous material
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United States of America Patent
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-
Sep 5, 2000
Grant Date -
N/A
app pub date -
Jul 21, 1997
filing date -
Apr 23, 1993
priority date (Note) -
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status (Latency Note)
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Abstract
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, wherein the digester (1) is fitted with an additional digester screening arrangement (2) above the lowest screening arrangement (1B) of the digester so that the temperature in all the participatory cooking zones in the digester can be kept at essentially the same temperature level.
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