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Volume: 57 | Article ID: art00004
Electro-Rheological Model of HP Indigo ElectroInk
  DOI :  10.2352/J.ImagingSci.Technol.2013.57.3.030403  Published OnlineMay 2013

Abstract ElectroInk, developed and manufactured by HP Indigo Division for its digital printing presses, is a complex fluid of unique rheological and electrical properties. Depending on the shear and the electric field the ink may be solid- or fluidlike. As ElectroInk propagates in the press from the ink reservoir to the substrate, the concentration increases while the structure of the ink changes from a dispersion of non-interacting particles to an elastic solid. The authors’ model treats ElectroInk as an interwoven structure of two continuous phases, one being a network of pigmented resin particles and the other the incorporated liquid. In an external electric field the network shrinks like a sponge and partial phase separation occurs. Application of the model is shown for the design of 100% transfer of ink from roller to roller in the press, which is necessary to meet the principal requirement of digital printing, that each printed page can be different.

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Peter Forgacs, Albert Teishev, "Electro-Rheological Model of HP Indigo ElectroInkin Journal of Imaging Science and Technology,  2013,  pp 30403-1 - 30403-7,

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