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Measurement of electric charges on flowing toner with an electrostatic voltmeter

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In every electrophotographic development system, the optimal charging and mass transfer processes are crucial for achieving high quality prints. Therefore, precise measurements of both charge and mass of toner become very important. This paper presents a novel method for measurements of the electric charge of the flowing electrophotographic toner particles. An electrostatic voltmeter (ESVM) is used for precise measurements of the voltage induced by charges carried by the flux of solid toner particles and by the charges generated on the walls of a dielectric pipe, while the toner is pneumatically transported through the pipe. Additionally, the total charge and mass of the toner are measured before and after passing through the pipe. In this way, voltages registered by the ESVM can be correlated with the amount of charge created by tribocharging. This allows for determination of tribocharging properties of the toner at a given particle flow velocity and for a given dielectric pipe material. The ESVM is a convenient, noncontacting, continuous, real-time charge monitoring tool.

Document Type: Research Article

Publication date: January 1, 2004

More about this publication?
  • 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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