Title:
【発明の名称】パルプの機械的損傷を避ける方法
Document Type and Number:
Japanese Patent JP2003500568
Kind Code:
A
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° C. to 70° 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.
Inventors:
Svedman, Michael
Application Number:
JP2001500051A
Publication Date:
January 07, 2003
Filing Date:
May 22, 2000
Export Citation:
Assignee:
Messo Chemical Pulping Oy
International Classes:
D21C3/22; D21C7/08; D21C9/00; (IPC1-7): D21C3/22
Attorney, Agent or Firm:
Nobuo Kaida (3 outside)