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Analysis of the Tribocharging Mechanism and the Surface Properties of a Development Roller in an Electrophotographic Toner Development System

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In previous work, we observed that current flows through each system part (i.e. development roller, blade, and supply roller) in normal operation during roller rotation in a mono-component development system. Measurement of these currents was shown to be useful for determining toner charging and charge transfer mechanisms. A theoretical analysis of the process is presented and by comparing this with the experimental data, it is suggested that an effective bias is generated between the doctor blade and the development roller surface due to the toner charging. By measuring the surface potential on the development roller as it was rotated, charge trapping at the development roller surface was experimentally observed. This trapped charge was released by contacting with the supply roller. It was found that the surface characteristics of the development roller considerably affected the current and the charge retention of the surface. This is shown to result in a “residual voltage” that is related to the effective bias controlling the current flow.

Document Type: Research Article

Publication date: January 1, 2005

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  • For more than 25 years, NIP has been the leading forum for discussion of advances and new directions in non-impact and digital printing technologies. A comprehensive, industry-wide conference, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems, including drop-on-demand ink jet, wide format ink jet, desktop and continuous ink jet, toner-based electrophotographic printers, production digital printing systems, and thermal printing systems, as well as the engineering capability, optimization, and science involved in these fields.

    Since 2005, NIP has been held in conjunction with the Digital Fabrication Conference.

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