Journal
NORDIC PULP & PAPER RESEARCH JOURNAL
Volume 22, Issue 3, Pages 336-342Publisher
AB SVENSK PAPPERSTIDNING
DOI: 10.3183/npprj-2007-22-03-p336-342
Keywords
hardwood pulp; surface modification; carboxymethyl cellulose (CMC); sorption; DDJ-fractionation; tensile stiffness; sheet and fibre properties
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An ECF-bleached hardwood pulp was treated with carboxymethyl cellulose (CMC) under specified conditions. This paper studies the combined effect of CMC modification, drying conditions and DDJ-fractionation of hardwood pulp on fibre and strength properties of paper. The drying effect was investigated by drying the sheets in a drum (free drying) or on a plate (restrained drying). The CMC-treatment increased markedly the tensile stiffness index of the handsheets dried under restraint. Moreover, all strength properties were significantly increased after the CMC modification. The effects of the fines were investigated in the second part by fractionating the pulp by a Super DDJ. Fines affected internal and tensile strength positively.
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