The Study of the Properties of the High Yield Pulp From Corn Stalks

In this research, the effect of pulping conditions on the high yield pulp from the corn stalks was studied. The biometric properties and chemical compositions of stalks were measured, and then the stalk pulping was done by injecting sodium sulfate amounting to 8,10,12 and 14 % (Sodium Hydroxide at constant ratio of 8 %) and then the time variables of 30, 45, and 60 minutes were measured at the Pulping temperature of 95 oC . The yield after the impregnation varied from 70.80 to 87.20% and after the defibration varied from 53.10 to 68.70 % . Based on the results of measurements of pulping yield, pulping with different amounts of Sodium Sulfate at a constant ratio of Sodium Hydroxid and the temperature of 95 oC for 30 minutes were selected for measuring the properties the pulp strength. The pulp was purified up to 400 ml degree of Canadian standard, and after producing the hand-sheet, its strength properties were measured. The statistical analysis of strength indexes revealed that the pulping condition with 10% of Sodium Sulfate, 8% of Sodium Hydroxide, the temperature of 95 oC and 30 minutes are the most appropriate. The pulp properties consist of the breaking length, tear index, and tensile index measured at 2.07 km, 8.28 mN.m2/g,and 20.40N.m/g respectively.