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01-04-2012 | Issue 2/2012

Cellulose 2/2012

Significance of fatigue for mechanical defibration

Journal:
Cellulose > Issue 2/2012
Authors:
Ari Salmi, Lauri I. Salminen, Mikael Lucander, Edward Hæggström

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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