Means towards optimal brightness stability

Tiina Liitiä, Veli-Matti Vuorenpalo, Stina Grönqvist, Kristiina Poppius-Levlin

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Abstract

Brightness stability of both mechanical and chemical pulps is considered, and possible means to control discoloration reactions are addressed. As a new approach to retard the yellowing tendency of mechanical pulps, an enzymatically assisted bonding of inert compounds to the reactive sites of mechanical pulp is introduced. Promising results have been obtained by treatment of bleached mechanical pulps with laccase and linoleic acid. The brightness stability of chemical pulp, on the other hand, is largely determined during pulp processing, and especially bleaching. The efficient removal of hexenuronic acids (HexA) and residual lignin, as well as the role of final bleaching stage in ECF sequence in respect of pulp carbonyl groups are very important.
Original languageEnglish
Title of host publicationPulPaper 2007 Conference
Subtitle of host publicationInnovative and Sustainable Use of Forest Resources
Number of pages8
Publication statusPublished - 2007
MoE publication typeB3 Non-refereed article in conference proceedings
EventPulPaper 2007 Conference Innovative and Sustainable Use of Forest Resources - Helsinki, Finland
Duration: 5 Jun 20077 Jun 2007

Conference

ConferencePulPaper 2007 Conference Innovative and Sustainable Use of Forest Resources
CountryFinland
CityHelsinki
Period5/06/077/06/07

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Liitiä, T., Vuorenpalo, V-M., Grönqvist, S., & Poppius-Levlin, K. (2007). Means towards optimal brightness stability. In PulPaper 2007 Conference: Innovative and Sustainable Use of Forest Resources