Methods for producing high-freeness pulp
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United States of America Patent
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Jun 17, 2014
Grant Date -
Apr 12, 2012
app pub date -
Sep 22, 2011
filing date -
Oct 6, 2010
priority date (Note) -
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Abstract
Methods of producing mechanical pulps from lignocellulosic material including partial defibration of lignocellulosic material in a chip press followed by liquid impregnation, preheating the lignocellulosic material for 20 seconds or less at a pressure between 7.5 and 12 bar (gauge) prior to mechanically refining the lignocellulosic material in a primary mechanical refiner at a pressure between 7.5 and 12 bar (gauge), thus obtaining a high freeness pulp.
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