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Control Mechanisms for Print Quality Assurance in HP Indigo Presses

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The challenge of consistently achieving high print quality in HP Indigo digital presses is addressed both by the fundamentals of the liquid, HP ElectroInk™ based electrophotographic printing process, as well as by using a comprehensive set of ingenious control mechanisms. The control loops deal with a wide range of process parameters assuring the accuracy, consistency, and stability of the print quality.

We cover the major print quality related automatic control loops. The paper reviews the liquid ink parameters – concentration, conductivity, flow, and temperature. It also explains how the Organic Photo Receptor (OPC) charge and discharge levels are maintained. At a higher system level, we describe a method of verification of stable and accurate image density, gray level control, and color-to-color registration. A method for obtaining accurate dot positioning and approving high accuracy for duplex printing is presented. The paper reviews the main parameters, measurement devices and related algorithms, and shows how they lead to the consistent high-level print quality characteristic of HP Indigo digital presses.
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Document Type: Research Article

Publication date: 2004-01-01

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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