Digester for cooking pulp having staggered circular screens for isothermal cooking
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United States of America Patent
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Oct 22, 1996
Issued Date -
N/A
app pub date -
Mar 31, 1995
filing date -
Nov 18, 1992
priority date (Note) -
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status (Latency Note)
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Abstract
A screen system for a digester for continuous cooking under raised pressure and temperature of fibre material in a vertical vessel, 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 at least one of said screening arrangements (1, 2) has at least one screen element (2A) of which the main configuration is circular and which is assembled by means of welding, and which is fitted into the digester shell by means of welding.
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