Inkjet printed fine art reproductions are commonly sold under such trade names

Inkjet printed fine art reproductions are commonly

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Giclée, and Cromalin. Inkjet-printed fine art reproductions are commonly sold under such trade names to imply a higher quality product and avoid association with everyday printing. Methods There are two main technologies in use in contemporary inkjet printers: continuous and drop-on- demand . Continuous inkjet The continuous inkjet method is used commercially for marking and coding of products and packages. In 1867, Lord Kelvin patented the syphon recorder, which recorded telegraph signals as a continuous trace on paper using an ink jet nozzle deflected by a magnetic coil. The first commercial devices were introduced in 1951 by Siemens. In the thermal inkjet process, the print cartridges consist of a series of tiny chambers, each containing a heater, all of which are constructed by photolithography. To eject a droplet from each chamber, a pulse of current is passed through the heating element causing a rapid vaporization of the ink in the chamber and forming a bubble, which causes a large pressure increase, propelling a droplet of ink onto the paper . The ink's surface tension, as well as the condensation and resultant contraction of the vapor bubble, pulls a further charge of ink into the chamber through a narrow channel attached to an ink reservoir. The inks involved are usually water-based and use either pigments or dyes as the colorant. The inks must have a volatile component to form the vapor bubble; otherwise droplet ejection cannot occur. As no special materials are required, the print head is generally cheaper to produce than in other inkjet technologies. Piezoelectric DOD Most commercial and industrial inkjet printers and some consumer printers use a piezoelectric material in an ink-filled chamber behind each nozzle instead of a heating element. When a voltage is applied, the piezoelectric material changes shape
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  • Spring '17
  • Jogn Dew
  • Inkjet printer, Epson

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