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Title
Change in the capability of cellulose fibres to retain water during thermally accelerated ageing of paper
Authors
STEFAN SUTY KATARINA PETRILAKOVA SVETOZAR KATUSCAK SONA KIRSCHNEROVA MICHAL JABLONSKY KATARINA VIZAROVA and MILAN VRSKA
Received
June 21, 2011
Published
Volume 46, Issue 9-10 November-December
Keywords
hardwood bleached kraft pulp, recycling, swelling kinetics, hornification, thermal treatment
Abstract
The water retention value (WRV) as a measure of the capability of cellulose fibres to retain water (swelling of fibres)
was evaluated during accelerated ageing of acidic wood pulp newspaper containing 20% chemical fibres. It has been
found that the WRV considerably decreases with accelerated ageing. Relations between the WRV properties and the
mechanical properties of paper have also been evaluated. The characterization of samples by mercury microporosimetry has shown that the cumulative column of the pores increases with the period of ageing. On the other hand, the average radius of the pores, as well as their specific surface, decreases. This supports the process of hornification,
which occurs during accelerated ageing of paper, as the small pores get smaller and the larger ones get even larger as a
result of shrinkage of fibres. When considering accelerated ageing, hornification of fibres as one of the outcomes of
fibre brittleness has to be taken into account.
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