in this study, deinkability of old newspaper by conventional method and the effect of washing, flotation and combined washing/flotation processes were investigated on optical and superficial properties of the produced papers. the results from measuring of the optical and superficial properties indicated that using chemical treatment time of 20 minute and one stage washing resulted the papers wi...

deinkability of old newspaper was investigated using cellulase at different concentrations and treatment times. the results of optical properties of the made papers indicated that by increasing the enzyme concentration to 0.05 percent the brightness was increased to 47.5% iso and yellowness decreased to 11.03% iso. while at higher charges than 0.05 percent, brightness value the was decreased an...

in this research, the effect of different concentrations of pectinase has been investigated on deinking of old newspaper (onp). onp re-pulped at 5% consistency for 10 min in disintegrator (with 2650 rpm). enzymatic treatment of recycled onp pulp was done under constant conditions (10% consistency, duration time of 20 min, ph range of 4.5-5) at different pectinase concentrations (0.05, 0.1, 0.2,...

due to the problems of deposition of sodium silicate on the equipment and decrease of the service age of implements, deinking of old newspaper was accomplished using organic complex of sulvy-x in place of sodium silicate. sulvy-x was used at four levels of 0.3, 0.5, 0.7 and 1% on the basis of oven dry waste paper and chemical deinking was done. the effect of various charges of sulvy-x was inves...

in this study, precipitated calcium carbonate (pcc) was modified using cationic starch, and its effect on optical and physical properties of paper was examined in comparison with unmodified filler afterwards. to determine the filler retention in paper, both modified and unmodified fillers were added to pulp suspensions by 20, 30, and 40 percentages. for comparing the utilization effect of modif...

enzymatic deinking has been suggested as an environmentally friendly alternative to complement and replace for conventional chemical deinking. in the present research, the effect of hemicellulase from aspergillus niger has been evaluated on paper quality of mixed 70% old newspaper (onp) and 30% old magazine (omg) pulp. hemicellulose was used at different charges of 0.1 (h1), 0.2 (h2), 0.5 (h3) ...