STUDY OF REPRODUCIBILITY OF ADSORPTION DEINKING AND INFLUENCE OF AGEING OF RECOVERED PAPER ON DEINKING RESULTS

Abstract

In the recent years, ink removal from the recovered paper has gain several importance mainly due to environmental and economic reasons. Deinking industry has made several contributions to improve the existing technologies viz, flotation and washing deinking to remove ink particles from the recovered paper. There is no any further scope of improvement in the existing techniques in form of quality, energy efficiency, eco-friendly and yield to meet the everlasting demands of industry and consumer. So there is an urgent need of new technique to meet these criteria and recently a new methodology was developed to remove ink particles by the use of polymeric beads during pulping and termed as "Adsorption Deinking". These polymeric beads are able to adsorb the ink particles due to their surface chemistry. In my thesis work, I have worked on ensuring the reproducibility of this new deinking method and the effect of ageing of the recovered paper on results of adsorption deinking. The natural ageing of recovered paper decreases the brightness of the pulp after deinking as ageing helps in the strong binding of ink particles with the cellulosic fibres. During the work, it has been found that Adsorption deinking achieves comparable results as that of existent techniques at much higher consistency, and hence, making the process economic with comparable quality of the product. Adsorption deinking achieves good results for deinking of aged paper stored in climate room which makes this new technique highly suitable for deinking industry.