Deinking and Reuse of Old Coloured Newsprint

Abstract

Due to increase in paper product requirements and the sources for production gradually decreasing the percentage of deinked newsprint and other grades is expected to increase considerably over the next few years. About 80 per cent of all waste paper comes from three sources : Corrugated boxes, Newspapers, and Office papers. It is also observed that the biggest users of deinked waste paper are newsprint, tissue or other bright grades¹. As a result of the technological progress, use of colour in newspaper is becoming increasingly popular. In this work, oxidant acids such as sulphuric or acetic acids however play an important role for disintegrating the coloured materials from the old coloured newsprint in certain condition such as temperature, concentration of acid, and time. The paper produced has satisfactory optical and physical properties but a slight decrease in the mechanical properties, where addition of some additives such as polyvinyl alcohol, new pulp or paper shaving at certain percentage, improved these properties.