Significance of fatigue for mechanical defibration |
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Authors: | Ari Salmi Lauri I Salminen Mikael Lucander Edward Hæggström |
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Institution: | (1) VTT Technical Research Center of Finland, P.O.B. 1000, 02044 VTT, Finland;(2) Electronics Research Laboratory, Department of Physics, Division of Materials Physics, University of Helsinki, P.O.B. 64, 00014 University of Helsinki, Finland |
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Abstract: | The fatigue induced by high-frequency cyclic loading on the compressibility and tensile properties of wood and wood cell walls
was quantified. The non-elastic behavior of fatigued and reference samples was similar, whereas their elastic behavior differed,
as expected. Next, the effects of the dynamic fatigue on the mechanical pulping process were quantified by grinding fatigued
and untreated samples and by comparing the paper strength produced by the two pulps against the consumed pulping energy. Pre-introducing
fatigue increased the energy efficiency of grinding and may allow designing a more energy efficient mechanical pulping process. |
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