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A literature-based study on the loss tangent of wood in connection with mechanical pulping

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Abstract

In mechanical pulping, wood is dynamically loaded, which causes large heat losses due to wood viscoelasticity. The heat losses depend on the loss tangent (tan δ) of wood. The loss tangent has a temperature-dependent behaviour, especially in the lignin glass transition region. The glass transition softens wood, and is therefore necessary for gentle mechanical pulping, but at the same time, the loss tangent shows a maximum called the α-peak. The transient peak depends on temperature, loading frequency and moisture content. The temperature where the peak is found can be lowered with chemical treatments, but they also increase the magnitude of the peak. Thermal treatment in the presence of water also increases the magnitude. The loss tangent of wood depends, amongst other things, on the chemical structure of lignin, width of cellulose crystals, microfibril angle, and extractives in the cell wall.

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Acknowledgments

The author would like to thank Dr. Lauri Salminen and an anonymous reviewer for valuable comments.

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  1. Department of Forest Resource Management, University of Helsinki, P.O. Box 27, 00014, University of Helsinki, Finland

    Mikko Havimo

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  1. Mikko Havimo
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Havimo, M. A literature-based study on the loss tangent of wood in connection with mechanical pulping. Wood Sci Technol 43, 627–642 (2009). https://doi.org/10.1007/s00226-009-0271-4

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  • DOI: https://doi.org/10.1007/s00226-009-0271-4

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