the influence of mixed office waste dip on the mechanical and optical properties of writing and printing paper

mixed office waste dip produced at latif paper company was used as reinforcement pulp to substitute part of imported long fiber pulp in white poplar apmp furnish produced at maraghe paper company. each pulp was separately refined to about 250 csf and then, handsheets were made applying 0(control sample), 5, 10, 15, 20 and 25 percent dip mixed with apmp and lf pulps. the control sample contained 30 percent lf and 70 percent apmp pulps. mechanical and optical properties of the handsheets, including tensile, tear and burst strengths, brightness and opacity were determined according to relevant tappi standard test methods. comparison of the data was done using anova and the best treatment, was determined using scoring method based on normalization equation. the results showed that 5 to 15 percent mixed office waste dip can be properly used in mixtures with 15 to 25 percent lf and 70 percent white poplar apmp pulps to produce writing and printing paper with suitable mechanical and optical properties.