EFFECT OF CCA AND CHARGING BEHAVIOR ON PRINT QUALITY

Abstract

ABSTRACT Fourteen test toners and two types of toner of irregular shape and spherical shape were studied for charging behavior. There are three types of CCA of various concentrations. They were mixed by rotation roller, developing roller, 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 were carried out to obtain correlation with charging properties. The charge of the toners with CCA increased to an equilibrium state within a shorter time. The toners without CCA have the lowest density. The higher the CCA amount, 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. This article describes the effects of CCA type/its concentration and charging behavior on the extent of q/m values which controls the print quality.