عنوان مقاله [English]
This study carried out to provide improvement of recycle paper strength made from OCC. Chemical treatment of OCC pulp carried out with 1% sodium chloride as ion exchange stage and then extraction by 3% and 5% sodium hydroxide based on oven dry pulp. Slurry temperature during the chemical reaction adjusted to 25 and 70 ° C. Handsheets were made based on a new standard method by KCL sheet former using a closed water system. Water retention value (WRV), sheet density and strength have been measured to characterize the fiber treated properties. No significant differences in WRV were found among control and treated pulps despite of maximum increasing of 25% applying 3% NaOH, ionic exchange, and room temperature. The mentioned conditions was selected as the best condition which significantly improved apparent density, burst strength, tear strength and RCT.