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Investigations on the suitability of different pulps for the production of tissue papers
Project
Project code: BFH-V-02-4.5
Contract period: 01.03.2003
- 30.06.2004
Purpose of research: Applied research
For the production of tissue paper, softwood pulps are preferred over hardwood pulps because they supply better paper strength due to their longer fibers. On the other side, hardwood pulps are of interest for the production of tissue papers as well, because they give better softness and better volume and thus better absorptions properties.
In this study the focus was put on the suitability of pulps prepared from beech wood for the production of tissue paper. In Germany, beech is the by far most important hardwood species. Due to its high availability and its low price it is an attractive raw material for the pulp production. However, the beech pulps produced in Germany by applying the acid sulfite pulping process have rather poor strength properties. Therefore the possible application in tissue production is strongly restricted because this pulp can only be added in small charge to softwood pulp. Eucalyptus kraft pulp shows a much better suitability than acid sulfite beech pulp. Certainly this is due to the raw material, but also to the pulping process. The kraft process, as an alkaline pulping process, gives pulps with better strength properties and also otherwise better suitability for the production of tissue paper.
An essential task of this study was to examine if it is possible by application of the alkaline sulfite pulping with AQ addition (ASA process), the high yield bisulfite process, or the kraft process to produce beech pulps which show much better suitability for tissue production than the traditional acid sulfite beech pulp. An increased use of beech pulp in tissue production would have a positive impact on the production cost due to the lower cost for the raw material. In addition the product quality could be improved because hardwood pulps are basically well suited for tissue production.
Section overview
Subjects
- Biotechnology
