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Tribocharging of Toner Particle in Two-Component Developer

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The effects of toner components and their size on the property of tribocharging of toner are important to evaluate the electrophotographic developer. However, characterization of electric charge and size of toner has been separately done by several conventional methods. We have made a step of development in a simultaneous data processing to evaluate electric charge and size of each toner particle and their relationship by a laser Doppler velocimeter. Size dependence of charge to mass ratio q/m for individual toner particles in addition to electric charge quantity q is visualized by the method on the instrument. Through the statistical data processing, experimental study on tribocharging between polyester toner particles and ferrite binder carrier or polymer coated ferrite carrier beads in two-component developer is done. From the experimental results the n-th power dependence of diameter on tribocharge in the two-component developer system of polyester toner and ferrite binder carrier is 2.35 for the particles without silica coating, and the value is 2.02 for the particles without silica coating in the system of polyester toner and polymer coated ferrite carrier. Some physical approaches on tribocharging mechanism between toner and carrier are described to explain the discrepancies based on the second power dependence of diameter using the surface state theory.
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Document Type: Research Article

Publication date: 1998-01-01

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