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These characteristics of pagewide writing systems will be discussed in more detail in the following sections.

Inks for HP PageWide printing

HP developed a new generation of water-based pigment inks to meet the unique requirements of pagewide, technical graphics printing. In particular, high black and color densities must be produced in a single pass with lower ink loadings compared to scanning printhead printers.

Multi-pass print modes in scanning printhead systems limit wet dot-to-dot interactions by allowing ink to penetrate and spread between printhead passes. Several seconds can elapse between scans before a dot is printed next to its neighbor. This can allow higher ink loading than possible in a single pass because the ink is partially-absorbed between passes. Typically, it takes about 100 milliseconds for a drop of water-based ink to wet and begin to spread and absorb on the media surface.

In HP PageWide Technology, all the drops from each die are printed in a single-pass and within about 5 milliseconds at typical media feed rates. So, all ink interactions are wet-on-wet, and this is a challenge for ink design to control color bleed, feathering, and mottling in area-fills and images.

“Decap” performance—where the printhead is uncapped and does not have access to a service station for a clean and wipe cycle—is critical to pagewide printhead reliability and image quality. Without properly managing the effects of decap, print quality defects from slow, weak, or misdirected drops may quickly become visible. Scanning printhead printers typically spit a few drops from each nozzle into a service station spittoon every few seconds. In high-productivity applications, a pagewide printhead must operate reliably for several minutes without a visiting the printhead service station. Ink design plays an important role in this capability.

New HP PageWide Pigment Inks were formulated to meet these requirements. A companion Technical White Paper, Inks for HP PageWide Technology, discusses ink performance requirements and innovations in design of inks for HP Large Format PageWide Printers.

Media

A technical graphics printer must support a range of media commonly found in practical applications. These media include bond paper, vellum, thick bond paper, low-cost photo papers, poster papers, natural tracing papers, and polypropylene. HP PageWide Pigment Inks were designed to provide high line, text, and graphics quality on these materials.

Ink delivery system

HP PageWide Pigment Inks will be supplied in 400ml and 775ml cartridges. For unattended, high-productivity printing, some models of HP Large Format PageWide Technology Printers feature two sets of C, M, Y, and K cartridges. In dual-cartridge systems, the printer detects when a cartridge is out-of-ink and this triggers an automatic ink cartridge switchover. The operator can replace used cartridges while the printer is running.

When an ink cartridge is pressurized with air, ink is forced through tubes to the printbar and into an ink distribution system along the printbar. Flexible supply tubes allow the printbar to move vertically during servicing and capping.

Each printhead interfaces with an ink supply module. Ink supply modules are stackable and interconnect with each other to make a pagewide ink manifold. This scalable design allows printbars of different widths to be built by stacking together printhead and ink supply modules.

Each printhead is connected to its ink supply module with a needle and septum for each color. The four (4) ink ports on the printhead module are shown in Figure 2. A sheathed needle on the printhead module engages a septum on the ink supply module as the printhead is pushed and latched into place. Manual handling of ink tubes is eliminated.

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