How to evaluate the kraft pulp brightness stability

Tiina Liitiä, Tarja Tamminen

Research output: Contribution to conferenceConference articleScientificpeer-review


Proper accelerated ageing methods (dry vs. humid heat) and applicability of UV-Vis reflectance spectroscopy for brightness stability studies of kraft pulps were considered. It was shown that UV-Vis reflectance spectroscopy can be used as a very sensitive and simple method to follow the degradation of HexA during thermal ageing treatments of kraft pulps. It was confirmed that the dry heat treatment (105°C, 4h), often used for eucalyptus kraft pulps, does not fully reveal the contribution of HexA to brightness reversion, and may thus lead to erroneous
conclusions regarding the factors affecting brightness stability. According to UV-Vis measurements, dry heat treatment with prolonged reaction time leads to the
degradation of HexA, but the actual color forming reactions of HexA’s degradation products probably do not take place in dry conditions.
Original languageEnglish
Number of pages7
Publication statusPublished - 2007
MoE publication typeNot Eligible
Event3rd International Colloquium on Eucalyptus Pulp - Belo Horizonte, Brazil
Duration: 4 Mar 20077 Jul 2007
Conference number: 3


Conference3rd International Colloquium on Eucalyptus Pulp
CityBelo Horizonte


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