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High-Performance Charging Unit for Liquid Electrophotographic Presses

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The HP Indigo presses dominate the commercial printing market with more than 50% market share using Liquid Electrophotography technology with superb print quality, high productivity and wide paper gamut. The new HP Indigo 7000 Digital Press introduced in Drupa08 runs at a marking speed of 2.15 m/s and places about three quarter of a billion dots on the paper per second. The new press incorporates many breakthrough improvements, including a new charging system featuring a charge roller. This unique charge roller unit is the first such technology used in a production digital press and supports by far the highest process speed of any offset-quality electrophotographic press. The single charge roller replaces the three scorotron units used in the previous generation Series II presses with improved charging uniformity and reduced cost per page. The charge roller is also much easier to maintain and is a “green” solution with minimal ozone generation. In this paper we discuss the multiple challenges that had to be overcome to meet or exceed the initial charge roller unit design objectives. This includes a useful life of over a half million impressions, which is far longer than other charge rollers.

Document Type: Research Article

Publication date: 2009-01-01

More about this publication?
  • 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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