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Conductivity and Time-Constant Measurements on Magnetically-Agitated Electrophotographic Developer Using the Method of the Compensated Probe

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Abstract:

The general concept of developer “conductivity” is known to play a role in development rate and efficiency, but a packed powder cell measures conductivity under conditions quite different from an actual toning nip. For a two-component developer with magnetized carrier, the developer is magnetically agitated as it flows through the toning zone, while in the packed cell it is static. A test cell was constructed which agitates a thin layer of developer and subjects it to brief voltage pulses, as it would realistically experience in a nip transition. In many cases of interest the developer is insulating enough that most of the current is capacitive, making actual toning current difficult to discern. This particular problem can be overcome by designing the measurement circuit as a compensated probe, that is, with a capacitor in parallel with the current sense resistor. Example waveforms give evidence of a nonlinear conduction process in toning.

Document Type: Research Article

Publication date: 2003-01-01

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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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