Oil-borne printing inks are hydrophobic with a negative surface charge
in the pulp suspension to be de-inked. In contrast, water-borne flexo
inks are hydrophilic and negatively charged. Based on this different
nature of printing inks, their different behavior in flotation de-inki
ng is obvious. Current de-inking models do not describe the effects of
, for example, nonionic surfactants or water-borne inks in flotation.
The model presented is valid for different surfactant ionogenity and t
ypes of inks.