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Assessment of Resistivity Uniformity of HP-Indigo Developer Rollers

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The binary ink developer in the HP-Indigo press selectively applies condensed ElectroInk® onto the photoreceptor to form the image. The ink is transported by the elastomeric developer roller, which needs to be sufficiently conductive to allow its surface voltage remains essentially constant as it moves through the various interfaces encountered along its periphery. But it cannot be so conductive as to discharge the ink before it is developed. So it would be useful to know the roller resistance and its uniformity.

In this work we describe an impedance technique to map the developer roller resistance across its surface. The roller only needs to be a single conductive dielectric layer. Hence its relevant impedance spectrum can be simple and uniquely determined by the corresponding capacitance and resistance obtained at a single well-chosen frequency. Although the actual material can be more complex, we show that scanning the roller surface at one frequency can provide very useful information. The process is reasonably rapid, allowing multiple rollers to be readily compared to see if process/materials variations produce changes.
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Document Type: Research Article

Publication date: 01 January 2011

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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.

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