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Title
Wheat straw pulp fractionation. Part 1. The effect of cells vessels and fines on paper properties
Authors
PAIVI P. ROUSU MIKKO KARJALAINEN KAJ O. HENRICSON JOUKO NIINIMAKI ISKO KAJANTO and KAJ BACKFOLK
Received
May 24, 2012
Published
Volume 47 Issue 5-6 May-June
Keywords
non-wood, straw pulp, parenchyma cell, epidermal cell, vessel, paper property
Abstract
A study on the effect of fractionation of wheat straw pulp shows the effects of various wheat straw pulp components on
paper strength. An industrial type pressure screen and hydrocyclones of two different sizes were used to produce fines
and coarse fractions containing different amounts of parenchyma, vessel and epidermal cells. The vessels were found to
behave more like fibers in the fractionation process, and this made it possible to create parenchyma and epidermal cellrich fractions. By gradually replacing the original pulp with the different fractions, it was seen that certain paper
physical properties do not necessarily follow the expected trends. For instance, the fines fractions behaved very
differently and, by fractionating the suspension, better bulk-strength ratios were obtained. The coarsest fiber fraction
had the highest tensile and tear strengths, but the finest fines fraction gave the highest Scott bond values. By utilizing
this information, the fractionation process and dosing ratios can be used to obtain high-strength papers without any
negative effects on dewatering or densification.
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