Preparation of bleached chemithermomechanical pulp
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United States of America Patent
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Mar 29, 1994
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N/A
app pub date -
Jul 29, 1992
filing date -
Jul 12, 1988
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Abstract
Bleached chemithermomechanical wood pulp having a high degree of whiteness is economically prepared by mechanically disintegrating and chemically digesting lignocellulosic material with sulfite at a temperature of at least 100.degree.C. under saturated water vapor pressure and thereafter bleaching the pulp thus treated with hydrogen peroxide in an alkaline medium, and wherein no solids or liquids are removed from the pulp from the outset of treatment through completion of the bleaching step.
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