Deinking Agent for Used Paper Printed with UV Curable Ink

Abstract

The paper manufacturing industry in Japan is trying hard to reach its goal to raise the percentage of waste paper recycling to 60% by 2005. To achieve this target, relatively low grade waste paper must be used, while at the same time, the quality of de-inked pulp must be improved. For significantly increasing the use of lower grade waste paper, maintaining regenerated pulp quality, removing foreign materials and selection of waste paper must be conducted.
In recent years, printed materials with UV curable ink are often included in waste paper. The ink in the paper printed with UV curable ink is difficult to remove in the deinking process. As the amount of the waste paper in the printed materials increases, the quality of the DIP decreases dramatically. However, there is no feasible method to measure the exact mixing amount of the UV curable ink printed materials. Therefore, we have developed a deinking agent with a new function. This new function has exceptional ability to remove UV curable ink.
This is to report a de-inking agent that can produce high quality deinked pulp.