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The study for the mechanism of enzymatic deinking Part 2.
-The effect of enzymatic treatment condition and enzyme activiry on deinking efficiency- |
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| Mitsuhiro Sugino,(Central Research Laboratory, Nippon Paper Industries Co., Ltd)
Mitsuo Takai(Graduate School of Engineering, Hokkaido Univ. |
JAPAN TAPPI JOURNAL:54(6)78(2000) |
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Abstract:
We have studied the mechanism of enzymatic deinking because there is few papers concerning it. In the previous paper three important points were reported, namely, mechanical forces were necessary in enzymatic deinking, the main function of enzymes was to convert Hairy toner to Clean toner, and higher charge of enzymes gave a lower efficiency in ink separation at a flotation. A new test method was developed for the easy evaluation of the convertion rate from Hairy toner to Clean toner because this convertion could be a key of the mechanism in enzymatic deinking. By this method several enzymatic conditions and six enzymes were evaluated. The enzyme with higher Avicel activity could convert more effectively at a certain level of CMC activity. Therefore Avicel activity would be a key factor to remove fibers from Hairy toner along with mechanical force and CMC activity. And the enzyme addition could decrease mechanical force. Comparing the results by both the test and usual deinking experiment, the close correlation between them could be observed. We can confirm that Avicel activity is important factor for the conversion
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