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Dielectric Constant of Ink Layer on HP-Indigo Developer Roller

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The binary ink developer (BID) in the HP-Indigo press converts low viscosity ElectroInk┬« into a paste that is presented to the photoreceptor to form the image. The developed mass density depends on the voltage applied as well as the dielectric thickness of the photoreceptor and the paste. For a given ink thickness, less is deposited if its dielectric constant e is lower. In this work we describe a technique to determine the ink impedance over a wide frequency range. From this it is possible to extract e at concentrations near that of the paste in the development nip. For an Indigo-compatible magenta ink, we find that ε ≈ 2, quite close to that of the carrier fluid. The impedance spectra of the ink layer also show features not present in the dilute state, shedding more light on the ink constituents.

Document Type: Research Article

Publication date: January 1, 2010

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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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