Process for preparing a bleached chemithermomechanical pulp
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United States of America Patent
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Aug 16, 1994
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N/A
app pub date -
Oct 6, 1992
filing date -
May 25, 1987
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Expired
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Abstract
A process for preparing chemithermomechanical pulp comprising subjecting a lignocellulosic substance from which said pulp is to be formed to the simultaneous action of a sulfite and a reducing agent that is more electronegative than the sulfite ion during a nondestructive cooking operation at a temperature of about 100.degree. C. or above under saturated steam pressure; said simultaneous action taking place at an initial pH of between 7 and 12.5.
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