The Effects of Short Wave UV Irradiation (254-366nm) on Color Values of Recycled and Bleached ONP/OMP Pulps

Authors : Emrah Peşman, Hüseyin Kırcı, Evren Ersoy Kalyoncu

Pages : 57-67

View : 421 | Download : 3169

Publication Date : 2011-04-29

Article Type : Other Papers

Abstract :ABSTRACT As it is known, mechanical pulp papers include significant amount of lignin and carbohydrates as well as cellulose. Thus, when these lignin reach papers irradiated with short wave UV light they could not protect their color. In this study, bleaching of ONP/OMG recycled pulps with hydrogen peroxide, sodium percarbonate, sodium dithyonite, sodium borohydride and formamidin sulfunic acid were performed. Then the test papers of these pulps were irradiated with 254-366nm UV light and changes in the ISO Brightness, CIE L*a*b*, yellowness (YI) and whiteness (WI) values were observed. At the result of study, all bleaching agents were determined as insufficient in the respect of color stability. But if they compared with each other, the two stages sodium percarbonate-sodium borohydride bleaching sequence was gave the best results against to color reversion. Keywords: Old news/old magazine papers (ONP/OMG), Bleaching, Color Stability, UV Irradiation
Keywords : Atık gazete/magazin kâğıdı, Ağartma, Renk kararlılığı UV yaşlandırması

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