Effect of CCA and charging behavior on print quality

Fourteen test toners and two types of toner of irregular shape and spherica l shape were studied for charging behavior. There are three types of CCA of various concentrations. They were mixed by rotation roller, developing rol ler, and hand shaking. Charging properties of the toners were measured by E -SPART analyzer and blow off measurement unit. Evaluations of print quality in terms of solid density, background density and percentage of dot gain w ere carried out to obtain correlation with charging properties. The charge of the toners with CCA increased to an equilibrium state within a shorter t ime. The toners without CCA have the lowest density. The higher the CCA amo unt, the higher the print density, but the background density of the toners without CCA were higher than the toners with CCA In addition, the presence of CCA and silica affects the toner charge when the humidity is varied. Th is article describes the effects of CCA type/its concentration and charging behavior on the extent of q/m values which controls the print quality.