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TCF bleaching of wheat straw pulp using ozone and xylanase. Part A: paper quality assessment
M B Roncero1, A L Torres, J F Colom
1Department of Textile and Paper Engineering, E.T.S.E.I. Terrassa, Polytechnical University of Catalonia, Colon 11, Terrassa 08222, Spain. roncero@etp.upc.es
Abstract:
The XOAZRP TCF sequence was applied to bleach wheat straw pulp. Following each bleaching stage, the properties of the pulp (viz. kappa number, standard viscosity, borohydride viscosity and brightness) and of the resulting effluents were determined. The performance of the reagents was analyzed through the studies of xylanase treatment and crystallinity and scanning electron microscopy of the pulps. Finally, the pulp was refined at 1000 revolutions in a PFI mill and the mechanical properties of the resulting paper were determined and compared with those of paper from a eucalyptus pulp. Despite its shortcomings, wheat straw pulp can be effectively bleached with the proposed TCF sequence.