Fracture Properties in Filled Papers

Atsushi Tanaka, Eero Hiltunen, Heikki Kettunen, Kaarlo Niskanen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review


    The mechanical properties of paper are impaired by the addition of filler. The beating of kraft pulp and addition of starch are possible remedies for this. However, beating also has negative effects because it reduces opacity and bulk, and starch effects are limited by retention. Optimal use of the kraft pulp and starch is therefore important. We show that in pure kraft sheets beating alone can compensate for most of the adverse effects on mechanical properties caused by kaolin addition. In TMP-based sheets with kaolin, the mechanical properties are fairly insensitive to the kraft content unless very high beating levels are used. The primary role of kraft is to improve tensile stiffness, not tensile strength of paper. Starch and beating both improve inter-fiber bonding but beating also raises fiber segment activation. The latter mechanism contributes to tensile stiffness but reduces damage width. The other mechanical properties of paper appear to be insensitive to fiber segment activation.
    Original languageEnglish
    Title of host publicationThe Science of Papermaking
    Subtitle of host publicationTransactions of the XII Fundamental Research Symposium
    EditorsC. F. Baker
    PublisherPulp & Paper Fundamental Research Society
    ISBN (Print)978-0-9541126-0-8
    Publication statusPublished - 2001
    MoE publication typeA4 Article in a conference publication
    Event12th Fundamental Research Symposium: The Science of Papermaking - University of Oxford, Oxford, United Kingdom
    Duration: 16 Sept 200121 Sept 2001


    Conference12th Fundamental Research Symposium
    Country/TerritoryUnited Kingdom


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