Paper making and fiber liberation – Processes and products – Multi-layer waterlaid webs or sheets
Patent
1997-08-22
1999-06-29
Silverman, Stanley S.
Paper making and fiber liberation
Processes and products
Multi-layer waterlaid webs or sheets
162130, 162132, D21F 1104
Patent
active
059164174
ABSTRACT:
Stiffness improvements for multi-ply paperboard laid from chemically pulped softwood and hardwood papermaking furnish are obtained by fiber fractionating the softwood pulp and repositioning the resulting fractions. Chemically pulped and preferably bleached softwood fiber "rejects" of a fractionation screen are redistributed into the outer plies of a three-ply, 300-350 g/m (approximately 195 #/3,000 ft.) basis weight paperboard. The fractionation "accepts" are repositioned to the center ply for a 12% to 15% increase in Taber stiffness. The short, "accept" fiber from the fractionation screen is mixed with chemically pulped hardwood fiber or modified mechanical pulp of either species for formation of the center ply on a multiformer paper machine.
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Cassidy Robert F.
Kerstanski Dennis J.
Mahale Anant D.
Mahony Robert V.
International Paper Company
Nguyen Dean T.
Silverman Stanley S.
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