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The Scalable Pipeline Architecture behind HP's T300 Color Inkjet Web Press

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The HP T300 Color Inkjet Web Press uses two identical print engines capable of printing full variable data at 400 fpm and 1200x600dpi on a 30” wide web. Each print engine prints four colors of ink (CMYK) and Bonding Agent (BA). Each of the five inks employs two print bars in tandem in an arrangement that provides nozzle redundancy. Each of the 10 printbar contains seven 4.25” thermal inkjet printheads with over ten thousand nozzles each. This massive array of nozzles consumes 35 Giga bits of nozzle firing data per second.

The data flow starts with the Digital Front End which provides the interface to the press, processes job ticketing and decomposes incoming PDF files into small chunks that are then concurrently processed by a scalable array of raster image processors (RIPs) built on high-performance blade servers. This solution allows RIPs to be tailored to meet any demand required by a customer's print job.

The raster images are then compressed and buffered before being delivered in print sequence order to the two print engines.

The print engines partition the incoming raster images into bands called slices; each slice covers the width of one Printhead plus some overlap area. Image processing hardware runs in parallel for each slice transforming the compressed CMYK continuous tone raster into real time nozzle firing instructions.

The result is a scalable image processing architecture that extends to wider presses by simply replicating the basic hardware building blocks across the web.
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Document Type: Research Article

Publication date: 01 January 2010

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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.

    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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