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Straining and relaxation properties of wet paper during heating

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Abstract

The influence of increasing temperature on the strength and relaxation of wet press-dry paper was studied using a tensile tester equipped with a special heating chamber. The heating chamber made fast heating possible without detectable moisture loss. The results showed that temperature had a significant influence on the straining, relaxation and re-straining behavior of wet paper. The majority of observed changes due to increased temperature seem to originate from the softening of wet fibers. The observed short time scale phenomena in wet paper have practical significance for fiber webs dried under tension in paper machines. Straining–relaxation–de-straining cycles were used to analyze the effect of heating on the work of straining and apparent plastic and elastic work. Heating affected the amount of mechanical energy absorbed by the sample and the amount of elastic energy recoverable in a straining–relaxation–de-straining cycle. Increased temperature reduced the work of straining and both elastically and plastically absorbed energy. The hysteresis work of the examined wet papers was estimated to correspond to a 1–22 mK temperature change. This suggests that temperature changes in wet paper induced by straining play no role in practice. After mechanical conditioning, tensile stiffness in the re-straining of wet paper depended only marginally on temperature, whereas in initial straining the effect of temperature was clearly stronger. The linear thermal expansion coefficient of wet paper in the machine direction was estimated and the influence of moisture content on the linear thermal expansion coefficient of paper was found to be relatively small.

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Acknowledgements

The authors wish to thank Valmet Technologies Oy for financial support. Joonas Sorvari is gratefully acknowledged for his assistance with LaTeX formatting.

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  1. VTT Technical Research Centre of Finland, P.O. Box 1603, 40101, Jyväskylä, Finland

    Jarmo Kouko & Elias Retulainen

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  1. Jarmo Kouko
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Kouko, J., Retulainen, E. & Kekko, P. Straining and relaxation properties of wet paper during heating. Mech Time-Depend Mater 18, 697–719 (2014). https://doi.org/10.1007/s11043-014-9246-4

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