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Neutral Deinking of Old Newspapers Contaminated with Flexo Ink - Evaluation of the deinking efficiency of alcohol type neutral deinking agents -  

Ryu, Hoon (Program in Environmental Materials Sciences, College of Agriculture and Life Sciences, Seoul National University)
Lee, Hak-Lae (Program in Environmental Materials Sciences, College of Agriculture and Life Sciences, Seoul National University)
Publication Information
Journal of Korea Technical Association of The Pulp and Paper Industry / v.38, no.4, 2006 , pp. 31-40 More about this Journal
Abstract
Presence of old newspapers printed with waterbased flexographic inks leads to a significant loss of brightness of the deinked pulp by flotation process. It has been shown that neutral or acidic flotation deinking has many advantages in recycling of flexo printed newsprints. A comparative experimental study was performed to evaluate the deinking efficiency of three alcohol type deinking agents in flotation deinking of flexo printed newspapers. Zeta potential of neutral deinked pulp was less negative than alkaline deinked pulp. Also neutral deinking was advantages in reducing turbidity, COD, and cationic de-mands of deinking process water.
Keywords
neutral deinking; flexo ink; surfactant; ONP; flotation;
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  • Reference
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