THE EFFECTS OF FINES OF WOOD AND NON-WOOD PULPS ON SHEET STRENGTH PROPERTIES
Fines are an essential component in the pulps for papermaking. The objective of this study was to investigate the effect of fines in wood and non-wood pulps on the pulp and paper properties. Three unbleached and bleached pulps from domestic bamboo, eucalyptus and wheat straw were studied in terms of how they responded to the fractionation of fines using Bauer Mc-Nett classifier after refining in a PFI mill. Hand sheets were prepared from the whole pulps and from pulp fractions with or without white water recycle respectively. The results showed that fines exert a profound influence on drainability of the pulp suspension. The 0SR values deceased significantly when fines were removed from all pulps. The fines in bamboo and eucalyptus contribute significantly to the strength properties, however wheat straw fines seems to work only as filler, i.e. do not contribute to strength properties. The morphological appearance of wheat straw fines, i.e. vessels and epidermal cells, can explain their no contribution to strength. It was concluded that fines are a potential variable in controlling pulp and paper quality. When removing the fines prior to bleaching of wheat straw, additional benefits besides better dewatering were achieved, namely much higher brightness after ECF (O-D-EOP-D) bleaching and less COD in the bleaching effluents. All these benefits were achieved without negatively influencing the final pulp strength properties.
non-woods woods bamboo eucalyptus wheat straw fines Bauer Mc-Nett classifying morphology ECF Bleaching pulp sheet properties
Wang Qianqian Anette Heijnesson-Hultén Zhan Huaiyu Jiri Basta Thomas Greschik Zhou Shengfei
State Key Laboratory of Pulp & Paper Engineering,South China University of Technology, Guangzhou,510 Eka Chemicals, SE-445 80 Bohus, Sweden
国际会议
广州
英文
1535-1538
2010-11-08（万方平台首次上网日期，不代表论文的发表时间）