Chemithermomechanical pulping of white birch for newsprint
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The main objective of the study was to investigate the mechanical pulping characteristics of white birch (Betulapapyrifera Marsh.) by a chemithermomechanical process using NaOH and Na2SO3 in the pretreatment of chips prior to pressurized refining. The results indicated that the NaOH had significant effect upon the pulp quality, whereas the Na2SO3 was of limited importance. Chemithermomechanical pulp of white birch was further found to be suitable for at least partial replacement of high-cost chemical pulp component, customarily added to newsprint furnishes, without lowering of paper properties.
1977 ◽
Vol 35
◽
pp. 308-309
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2005 ◽
Vol 25
(1_suppl)
◽
pp. S279-S279
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