Interfacial Studies and Application Tests on the Flotation of Printing Inks and Fillers, 1990 Pulping Conference Proceedings
Typical problems encountered in the recycling of paper include the removal of flexo printing inks and fillers such as kaolin and calcium carbonate. This paper will address recent developments to improve flexo ink and filler removal in flotation deinking.
Flexo printing inks are difficult to remove from the fiber via flotation deinkina due to the inks’ dispersability and their small particle size. Recent studies using special cationic polymers have shown it is possible to flocculate these inks and achieve good results in conventional flotation deinking.
Fillers such as kaolin and calcium carbonate limit the use of waste paper in newsprint and tissue.
Experiments using model dispersions of calcium carbonate and kaolin were conducted to determine the effect of anionic surfactants on the removal of fillers. The results show that certain surfactants can be used with fatty acid collectors to effectively remove the fillers and printing inks.
Interfacial Studies and Application Tests on the Flotation of Printing Inks and Fillers, 1990 Pulpin
