IMPROVING WET WEB RUNNABILITY AND PAPER QUALITY BY AN UNCHARGED POLYSACCHARIDE
The effects of xyloglucan addition on wet web strength, drying tension and end product quality of bleached birch kraft pulps were examined with laboratory trials. Specific xyloglucan dosages were applied onto wet fibre networks by spraying. Laboratory sheets were prepared of never-dried and once dried birch pulps. Wet sheet strength and drying characteristics were analysed using diverse analytical instruments. Structural, strength and surface properties of dry sheet samples were tested according to standard methods. Wet web strength and tension holding potential of test samples increased with the addition of xyloglucan, which is an indication of better wet web runnability. Xyloglucan also increased the drying tension. Besides enhanced runnability, xyloglucan treatment was also found to improve end product quality by improving smoothness and dry strength properties, and decreasing air permeability. Results indicate that xyloglucan treatment has greater strengthening potential with once-dried chemical pulp, whereas the effect with never-dried pulp was smaller. Therefore, xyloglucan seems to have potential especially in recovering the strength properties of pulp with hornified cell walls, such as in recycled pulp. In general, these results can be exploited in paper and board machines for tailoring fibre networks for different product grades or special functional products.
spraying xyloglucan uncharged polysaccharide chemical pulp wet strength drying stress runnability
Antti Oksanen Rantanen Timo Elias Retulainen Kristian Salminen Harry Brumer
VTT Technical Research Centre of Finland, VTT, PO Box 1603, FI-40101 Jyv(a)skyl(a), Finland VTT Technical Research Centre of Finland, VTT, PO Box 1300, FI-33101 Tampere, Finland Royal Institute of Technology, School of Biotechnology, Division of Glycoscience, SE-10691 Stockholm
国际会议
广州
英文
1444-1447
2010-11-08（万方平台首次上网日期，不代表论文的发表时间）