Process for upgrading of thermomechanical pulp to higher quality pulp
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United States of America Patent
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Mar 26, 2002
Grant Date -
N/A
app pub date -
Aug 21, 2001
filing date -
Nov 19, 1998
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Abstract
Processes are disclosed for processing low consistency newsprint pulp including refining the pulp in a first refiner to a consistency of greater than 2%, screening the processed pulp with a slotted screen basket with a slot width of from 0.05 to 0.15 mm, with the withdrawal of the primary reject portion being greater than 50%, withdrawing the accept portion for further processing, dewatering the reject portion to provide a high consistency pulp, refining the high consistency pulp in a second refiner, screening the processed high width consistency pulp with a slotted screen basket having a slot of less than 0.15 mm, and combining the two accept portions for the further processing steps.
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