Optimising CMC sorption in order to improve tensile stiffness of hardwood pulp sheets

Minna Blomstedt*, Eero Kontturi, Tapani Vuorinen

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    26 Citations (Scopus)


    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.

    Original languageEnglish
    Pages (from-to)336-342
    Number of pages7
    JournalNordic Pulp and Paper Research Journal
    Issue number3
    Publication statusPublished - 2007
    MoE publication typeA1 Journal article-refereed


    • Carboxymethyl cellulose (CMC)
    • DDJ-fractionation
    • Hardwood pulp
    • Sheet and fibre properties
    • Sorption
    • Surface modification
    • Tensile stiffness


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