Abstract
A new individual wet fibre flexibility test has been devised, and used to investigate the relationship between fines-free sheet apparent density and the wet flexibility of the constituent fibres. Linear relationships were found for a number of pulps, ranging from bleached chemical to thermomechanical, and for several different pulp treatments. It was concluded that changes in the average wet fibre flexibility of a particular pulp, caused by mechanical and/or chemical treatment, can be evaluated by measuring the apparent density of the fines-free sheet, at least over the investigated range (240-760 kg/m³).
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