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Laitinen, O., Kemppainen, K., Stoor, T., and Niinimäki, J. (2011). "Fractionation of pulp and paper particles selectively by size," BioRes. 6(1), 672-685.


A study was made of the classification of pulp, paper, and peat particles by size with a device called a tube flow fractionator. An accurate and simple experimental model was formulated in order to estimate the time required for fractionation, yielding an excellent correlation between the observed and predicted fractionation times. The results showed that the fractionation time of a certain size of pulp, paper, and peat particles in the tube flow device can be accurately estimated from the length, width, and thickness of the particle. The results can be used to facilitate the selection of specific fractions of pulp and paper samples.
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