Oxygen delignification and it?s modification of pulps produced from waste corrugated cardbord

Master ThesisSUMMARYOXYGEN DELIGNIFICATION AND IT?S MODIFICATION OF PULPS PRODUCED FROM WASTE CORRUGATED CARDBORDBasri Oktay KOÇKaradeniz Technical UniversityThe Graduate School of Natural and Applied SciencesDepartment of Fiber and Paper TechnologySupervisor: Prof. Esat GÜMÜŞKAYA2012, 81 PagesIn this study, oxygen delignification was applied to waste corrugated cardboards (WCB) and also to increase efficiency of oxygen delignification by the addition of hydrogen peroxide and sodium percarbonate, changes in properties of WCB pulp were investigated.By the addition of peroxide and carbonate to oxygen delignification, delignification yield was decreased by between 2 ? 4,31 %. Decreasing of the viscosity values of trials by increasing of alkaline ratio was determined. When the analyzing of relative degradation ratio, the highest relative degradation ratios were obtained by oxygen delignification reinforced with percarbonate but the lowest values with hydrogen reinforcement.When the degree of cristallite size were analyzed, the highest value was 9,3 nm achieved by oxygen delignification used 2 % alkaline, but lowest was 7,9 with oxygen delignification reinforced peroxide included about 6 % alkaline. In addition, when the color measurements of paper hand sheets were analyzed cautiously, the highest L* values were achieved by percarbonate reinforcement but a* values were decreased relatively control pulps, and also highest b*values were achieved by oxygen delignification with 2 % alkalinity. ISO brightness values were increased with increasing of alkalinity ratios and the highest value was achieved by oxygen delignification with 10 % alkalinity.Key Words: Reinforced oxygen delignification, Hydrogen peroxide, Sodium percarbonate, recycled corrugated fiberboard.