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학술대회자료
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한국펄프·종이공학회 한국펄프종이학회 기타 간행물 2006 PAN PACIFIC CONFERENCE Proceedings Vol.1
발행연도
2006.6
수록면
117 - 121 (5page)

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Virgin bleached kraft pulp, CPO (computer printout) and white ledgers are main raw materials used in tissue mills. The utilization rate of recycled fibers and virgin pulp in South Korea tissue industry are 90% and 10%, respectively. To improve brightness of printing grades the use of 'fluorescent whitening agents (FWAs)' or 'optical brightening agents (OBAs)' has been increased. When recycling these papers for tissue production, it is unavoidable that FWAs contained in recycled papers flow into tissue production lines and remain in the products. And this draws great attention from the public. This study was carried out to develop a technology for the removal of fluorescent whitening agents from recycled fibers. Enzymatic removal of FWAs was evaluated as a method to remove FWAs from the recycled fiber. The α-amylase that degrades starched used for surface sizing of fine papers and contained substantial amount of FWAs showed high efficiency in FWA removal. The pH of pulp suspension affecting the solubility and affinity of FWA onto fibers was one of the critical factors in FWA removal. It was found to keep pH in alkaline condition is needed to prevent the re-adsorption of FWAs on fibers. The temperature of pulp suspension was another important factor affecting on FWA removal. The higher the temperature, the greater the efficiency of removing FWAs was obtained. Optimum pH and temperature for the effective removal of FWAs were suggested to be pH 8.5 and 65℃, respectively. The enzymatic removal of FWAs showed a great synergistic effect when proper control in pH and temperature was made.

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ABSTRACT
INTRODUCTION
Experimental
Methods
Results and Discussion
Conclusions
ACKNOWLEDGEMENT
REFERENCE

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