| Abstrakt: |
This study was aimed to investigate the effect of polyalumium chloride and nano-chitosan on optical and mechanical properties of paper made using chemi-mechanical pulp. For this purpose, some of the bleached CMP pulp from Mazandaran Wood and Paper Industries (MWPI) were randomly selected as a control sample. In addition, the polyalumium chloride powder were used at 4 levels of 0, 0.5, 1, and 1.5%. The nano-chitosan was then added to the CMP pulps suspensions at 3 levels of 0, 1, and 2%, as well. Hand-sheets with a basis weight of 60 gr/m2 were prepared from the prepared pulps. The optical and mechanical properties were then measured and compared using TAPPI standard test methods. The results showed that by adding polyalumium chloride and nano-chitosan separately to the CMP pulps, brightness, opacity, greenness, tear, tensile, burst strengths, air resistance increased, but Cobb 60 and a* factor decreased. On the other hand, with the addition of nano-chitosan and polyalumium chloride to CMP pulp, the brightness and greenness increased, but tensile, burst, tear strengths, air resistance, Cobb 60 and opacity was initially fairly decreased and then acceptably increased. Moreover, the findings showed that by separate addition of 1% polyalumium chloride and 2% nano-chitosan(separate) and simultaneous addition of 2% nano-chitosan with 1.5% polyalumium chloride to the CMP pulp, most of the paper properties were improved. Therefore, it can be introduced as the best treatment. [ABSTRACT FROM AUTHOR] |
