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Finger Friction Measurements on Coated and Uncoated Printing Papers

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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.

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Acknowledgements

Support for this study was provided by the Institute Excellence Centre CODIRECT (Controlled Delivery and Release Centre), which is sponsored by Vinnova, The Swedish Foundation for Strategic Research, The Knowledge Foundation and Industry. M.W.R. is a fellow of the Swedish Science Council. Thanks are given to Jens Wahlström at the Department of Machine Design at The Royal Institute of Technology (KTH) for help regarding the MATLAB script, and also to Marie Ernstsson at the Institute for Surface Chemistry (YKI), for suggesting and analysing the XPS experiments and to Mikael Sundin at YKI, who performed them. The grant from Knut and Alice Wallenberg foundation for the XPS instrument is gratefully acknowledged. We also extend our thanks to Professor Bruce Lyne, for interesting discussions during the course of the study, and for feedback on the manuscript.

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Correspondence to Mark W. Rutland.

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Skedung, L., Danerlöv, K., Olofsson, U. et al. Finger Friction Measurements on Coated and Uncoated Printing Papers. Tribol Lett 37, 389–399 (2010). https://doi.org/10.1007/s11249-009-9538-z

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