D - Textiles – Paper – 21 – B
Patent
D - Textiles, Paper
21
B
92/55
D21B 1/00 (2006.01) D21B 1/24 (2006.01)
Patent
CA 1110480
PROCESS FOR THE PREPARATION OF GROUNDWOOD PULP ABSTRACT OF THE DISCLOSURE A process is provided for preparing groundwood pulp from debarked pulpwood logs, which comprises grinding the logs in the presence of water under a superatmospheric pressure of a gas selected from the group consisting of steam, air, and steam and air, and forming and discharging a pulp suspension in the resulting aqueous liquor, while continuously supplying water during the grinding in a volume of less than 36 parts per part of bone dry pulp at a rate of addition such that the temperature of the discharged pulp suspension is below 200°C and preferably below 180°C and within the range from about 1.5 to about 50, preferably from 2 to 8,times the temperature in °C of the added water at a pressure within the range from about 8 to about 40 kiloponds/cm2, preferably from 10 to 30 kiloponds/cm2, higher than the superatmospheric pressure and at a temperature within the range from about 2 to about 63°C; then, optionally, any one or more of the steps of centrifugally separating steam from the pulp suspension and using the separated hot steam for heating purposes; thickening the pulp suspension within the range from about 5 to about 50% and supplying water separated therefrom to the grinding; and adding bleaching chemicals to the pulp and bleaching the pulp; the groundwood pulp is obtained in a higher pulp concentration and at considerable saving in energy, can be used with our without bleaching, and has a high content of long flexible fibers.
340525
Macrae & Co.
Mo Och Domsjo Aktiebolag
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