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Improvement in Printing Throughput for Piezoelectric Line Ink Jet Print Head

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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.

Document Type: Research Article

Publication date: January 1, 2007

More about this publication?
  • For more than 25 years, NIP has been the leading forum for discussion of advances and new directions in non-impact and digital printing technologies. A comprehensive, industry-wide conference, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems, including drop-on-demand ink jet, wide format ink jet, desktop and continuous ink jet, toner-based electrophotographic printers, production digital printing systems, and thermal printing systems, as well as the engineering capability, optimization, and science involved in these fields.

    Since 2005, NIP has been held in conjunction with the Digital Fabrication Conference.

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