TCF BLEACHING OF KENAF PULP FOR PAPERMAKING APPLICATIONS

摘要

Peroxide reinforced oxygen (PO) and hydrogen peroxide (P) were used in the Totally Chlorine Free (TCF) bleaching of different fractions and blends of kenaf kraft pulps. The aim of the study was to bleach pulps to high brightness, while retaining sufficient strength properties. A brightness of 82.4-90.4 % ISO was achieved with moderate charge of peroxide. Final brightness and viscosity values demonstrated that using a Q(PO)OP sequence, bast, core and all blend fibers can be bleached to high brightness while retaining sufficient viscosity. It was seen that bast, core and all blend fibers exhibited great strength characteristics that are suitable for papermaking. Due to its short growth period, high yield and comparable physical and optical properties, kenaf is a viable and attractive non-wood fiber source alternative for soft and hardwood fibers.