Development of Deinking Agents for Flotation Systems: Part 3

In Japan, consumption of printing/information paper (OA paper) is in-creasing and consequently so is office wastepaper (OWP). To cope with increasing tonnage of OWP more applications for deinked OWP must be found and mix ratios in existing recycle content papers must be increased. This goal can be accomplished through improving the quality of OWP deinked pulp. To date most OWP in Japan is incinerated to protect confidential in-formation and because the quality of OWP pulp limits its use. With increasing OWP tonnage civil and economic pressure is building to de-velop effective OWP deinking technology. We responded by a study of deinking toner inked plain paper copy paper (PPC) and for control purposes included research on deinking conditions which effect ink detaching and collecting using newspaper offset inks. It became clear that the factors influencing deinking toner inks are significantly different from those of offset ink in newspapers. We found toner inks are much more difficult to detach than offset inks. But by increasing ink removal energy (mechanical energy), increasing process temperature and the inclusion of chemically specific deinking agents high quality OWP pulp can be produced, In this paper we analyze the variety and characteristics of deinking agents from an interfacial scientific standpoint.