| Summary: The aim of the study is to solution of enviromental pollution after the bleaching and raw material problem in a pulp and paper industry. So, fast growed species of bamboo (Phyllostachya bambusodies) and poplar (P. Euramericana x (Dode) Guinier) trees were choosen as a raw material. Pulp from this species were bleached by enviromental friendly bleaching. Cooking were done various conditions to obtain high yield and low kappa number for bleachable pulping. The lowest kappa number and higest yield were determined in sulfate-AQ cooking for bamboo and sulfate-NaBH4 cooking for Poplar. Optimization study under the different pressure were done to find convient condition of oxygen delignification for obtained pulping after the optimum cooking both of the two species. Mechanical properties of pulping obtained from both of two species were effected the lowest and also best economical conditions were determined in delignification conditions on O2 pressure 5 bar, NaOH rate % 3 and concentration % 12. Chelatin sequence was applyed after the oxygen delignification both of two species. Sodium perborate tetrahydrade bleaching as a last step After the chleating bleaching sequence. The rate of SPBTH and bleaching time were choosen as bleaching parameter in SPBTH sequence. For Bamboo and Poplar tensile index, burst index and tear index were rised after SPBTH. Kappa number and viscosity were decrease. Whitenes, brightness were increased but TAPPI Opacity and yellowness were decrease from Optical properties
Key World: Bleaching, Sodium Perborate, Oxygen delignification, Bamboo, Poplar, Mechanical properties, Pulp |
