Finger friction measurements on coated and uncoated printing papers

Lisa Skedung, Katrin Danerlöv, Ulf Olofsson, Maiju Aikala, Kari Niemi, John Kettle, Mark W. Rutland*

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    60 Citations (Scopus)

    Abstract

    A macroscopic finger friction device consisting of a piezoelectric force sensor was evaluated on 21 printing papers of different paper grades and grammage. Friction between a human finger and the 21 papers was measured and showed that measurements with the device can be used to discriminate a set of similar surfaces in terms of finger friction. When comparing the friction coefficients, the papers group according to paper grade and the emerging trend is that the rougher papers have a lower friction coefficient than smoother papers. This is interpreted in terms of a larger contact area in the latter case. Furthermore, a decrease in friction coefficient is noted for all papers on repeated stroking (15 cycles back and forth with the finger). Complementary experiments indicate that both mechanical and chemical modifications of the surface are responsible for this decrease: (1) X-ray photoelectron spectroscopy measurements show that lipid material is transferred from the finger to the paper surface, (2) repeated finger friction measurements on the same paper sample reveal that only partial recovery of the frictional behaviour occurs and (3) profilometry measurements before and after stroking indicate small topographical changes associated with repeated frictional contacts.
    Original languageEnglish
    Pages (from-to)389-399
    JournalTribology Letters
    Volume37
    Issue number2
    DOIs
    Publication statusPublished - 2010
    MoE publication typeA1 Journal article-refereed

    Keywords

    • friction test methods
    • surface roughness
    • biotribology
    • coated paper
    • uncoated paper
    • tactile feel
    • finger friction
    • skin friction
    • paper friction
    • perception

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