Production of fiber pulp by impregnating the lignocellulosic material with an aqueous alcoholic SO.sub.2 solution prior to defibration
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United States of America Patent
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Aug 16, 1994
Grant Date -
N/A
app pub date -
May 18, 1992
filing date -
Sep 28, 1989
priority date (Note) -
Expired
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Abstract
In a process for manufacturing chemo-mechanical and/or chemothermal-mechanical wood pulps, raw materials containing lignocellulose, such as wood shavings, wood chips, pre-ground wood or sawdust, are first impregnated with an aqueous alcoholic SO.sub.2 solution and then heated to a temperature between 50.degree. and 170.degree. C. for a period of 1 to 300 minutes. The wood shavings are then ground to the desired degree of fineness in a defibrinating device. The process makes it possible to achieve up to 50% reduction in grinding energy in comparison with known chemothermal-mechanical processes.
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