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Volume: 23 | Article ID: art00072_1
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Improvement in Printing Throughput for Piezoelectric Line Ink Jet Print Head
  DOI :  10.2352/ISSN.2169-4451.2007.23.1.art00072_1  Published OnlineJanuary 2007
Abstract

In the past two years, one of the authors published development and analyses works as to a drop on demand piezoelectric line ink jet print head. The print head is composed of a monolithic structure having resolution of 600 dpi in 108 mm print width. It is provided with 2,656 nozzles with corresponding pressure chambers, or cavities, in an area of 108 × 16.8 mm. This print head was originally designed to generate drops of 3 /7 /14 /21 pL at 20 kHz firing frequency for 600 × 600 dpi 4 grades grayscale printing at paper feeding rate of 847 mm/s. The authors have expanded its capability in firing frequency to 24 kHz with 3 / 7 /9 /12 pL drops. The higher frequency allows printing rate of 1,016 mm/s for paper feeding in the same resolution. In general, the faster printing requires more unity in drop formation to make pixels on a substrate shaped finely, which is inadequate for the original design. Therefore, modifications are made with the print head in its actuator and a cavity structure in order to unify drops for each pixel more consistently. Specifically, unimorph actuator thickness, cavity shape and depth are examined so that residual vibration in a channel might not break up a ligature during drop formation. As a result, the print head is improved in its printing speed as referred above.

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Shin Ishikura, Ayumu Matsumoto, "Improvement in Printing Throughput for Piezoelectric Line Ink Jet Print Headin Proc. IS&T Int'l Conf. on Digital Printing Technologies and Digital Fabrication (NIP23),  2007,  pp 305 - 309,  https://doi.org/10.2352/ISSN.2169-4451.2007.23.1.art00072_1

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