Method for avoiding mechanical damage of pulp
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United States of America Patent
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Apr 13, 2004
Grant Date -
N/A
app pub date -
Feb 26, 2002
filing date -
May 28, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for producing chemical pulp from cellulosic material by means of alkaline cooking, including cooking the material to pulp at cooking temperature in a digester, reducing the temperature at the end of the cook, substantially relieving the overpressure in the digester and then discharging the pulp from the digester by means of pumping. The method is characterized in that the pulp is cooled to essentially 85.degree. C. to 70.degree. C. before pumping cooked material as a fluid suspension from the digester, and that the temperature of the cooked material is maintained in the same temperature range and at a pH level being between 10 and 13, between the digester and a first delignification/bleaching stage, thus avoiding mechanical damage of cellulosic material.
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