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Size Dependence on Toner Charge in Two-Component Developer

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In the electrophotographic process, two-component developers are widely used for commercial machines. Quantity of tribo-electric charge on toner is one of the factors to affect image quality for copies. Effects of toner components and size on tribo-charging are important to evaluate electrophotographic developers. In this study, size dependence on toner charge is examined by a modified E-SPART (Electrical Single Particle Aerodynamic Relaxation Time) analyzer based on a laser Doppler velocimetric method for toner particles of styrene-acrylic copolymer in the size region from 6μ m to 10μ m. As a carrier, a polymer coated ferrite type or a non-coated type is used. From the experimental results, charge to mass ratio q/m decreases from 10 μ C at 6.4μ m to 4.6 μ C at 9.5μ m for toner without silica coating and CCA additives and the reverse m/q shows approximately a linear increase with diameter of toner in a two-component developer combined with a coated carrier. In case of a non-coated carrier, the n-th power size dependence on toner charge is shown to be about 2.7 for the toner with silica coating and CCA additives and about 2.2 for the toner without CCA additives. The results are explained to be consistent with prediction from the surface state theory.

Document Type: Research Article

Publication date: 2008-01-01

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  • For more than 30 years, IS&T's series of digital printing conferences have been the leading forum for discussion of advances and new directions in 2D and 3D printing technologies. A comprehensive, industry-wide conference that brings together industry and academia, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems?particularly those involved with additive manufacturing and fabrication?including bio-printing, printed electronics, page-wide, drop-on-demand, desktop and continuous ink jet, toner-based systems, and production digital printing, as well as the engineering capability, optimization, and science involved in these fields. In 2016, the conference changed its name formally to Printing for Fabrication to better reflect the content of the meeting and the evolving technology of printing.

    Please note: For purposes of its Digital Library content, IS&T defines Open Access as papers that will be downloadable in their entirety for free in perpetuity. Copyright restrictions on papers vary; see individual paper for details.

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