Understanding Extensibility of Paper: Role of Fiber Elongation and Fiber Bonding

Jarmo Kouko, Tuomas Turpeinen, Artem Kulachenko, Ulrich Hirn, Elias Retulainen

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


    The tensile tests of individual bleached softwood kraft pulp fibers and sheets, and micromechanical simulation of fiber network suggest that only a part of the elongation potential of individual fibers is utilized in the elongation of sheet. The stress-strain curves of two actual individual pulp fibers and one classic fiber were applied to a micromechanical simulation of random fiber networks. Both the experimental results and the micromechanical simulations indicated that fiber bonding has an important role not only in determining the strength but also the elongation of fiber networks. Additionally, the results indicate that the shape of the stress-strain curve of individual pulp fibers may have significant influence on the shape of the stress-strain curve of a paper sheet. A large increase in elongation and strength of paper can be reached only by strengthening fiber-fiber bonding, as demonstrated by the experimental handsheets with starch and cellulose microfibrils and by the micromechanical simulations. The key conclusion related to this investigation was that simulated uniform inter-fiber bond strength does not influence the shape of the stress-strain curve of the fiber network until the bonds fail, whereas the number of bonds has an influence on activation of the fiber network and on the shape of stress-strain curve.
    Original languageEnglish
    Title of host publicationPaper Conference and Trade Show, PaperCon 2019
    Number of pages12
    ISBN (Electronic)9781510893948
    Publication statusPublished - 5 May 2019
    MoE publication typeNot Eligible
    EventInternational Paper Physics Conference at PaperCon, IPPC - Indianapolis, United States
    Duration: 5 May 20198 May 2019


    ConferenceInternational Paper Physics Conference at PaperCon, IPPC
    Abbreviated titleIPPC
    Country/TerritoryUnited States


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