Papermaking quality of fines from different pulps: The effect of size, shape and chemical composition

E. Retulainen, K. Luukko, K. Fagerholm, Jaakko Pere, J. Laine, H. Paulapuro

    Research output: Contribution to journalArticleScientificpeer-review

    69 Citations (Scopus)

    Abstract

    The fines of chemical pulps have a strong tendency to intensify the interaction between fibres. This is mainly due to the increased density of the network. A sheet made of kraft fines has a remarkably high density, 1100 to 1200 kg/m3, whereas a handsheet made of TMP fines has a rather low density, about 450 kg/m3. In this study several pulps were compared. The fines formed a spectrum ranging from fines of bleached softwood kraft to the fines of mechanical pulp. The differences in bonding ability between softwood and hardwood kraft fines, as well as between bleached and unbleached softwood kraft fines, were rather small. Clearly larger differences in bonding ability can be found between different subfractions of fines from a certain chemical pulp. The smaller particles have better bonding ability. In addition to the size of the fines particles, the shape also seems to be an important factor. Additionally, the results indicate that the size, shape and chemical composition of the fines fraction are intercorrelated.
    Original languageEnglish
    Pages (from-to)457-460,467
    JournalAppita Journal
    Volume55
    Issue number6
    Publication statusPublished - 2002
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Fines
    • chemical pulp
    • mechanical pulp
    • paper properties
    • chemical composition
    • particle size
    • particle shape

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