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Application of Electrostatic Inkjet Phenomena to Micro-Film Formation by Spraying Viscous Liquid from Multi-Nozzles

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Micro spray mode of electrostatic Inkjet has been examined experimentally for the application of precision film coating. Critical issues of this technology lie in productivity and jetting viscous liquid. The former is that the amount of liquid jetted from a single nozzle is too small to obtain sufficiently high coating speed. The latter is that the stable jetting window of viscous liquid is narrow and the distribution of the droplet is not uniform. To overcome the situation, a possibility of jetting viscous solution from multi-nozzles was investigated in this report. As results, jetting from seven nozzles made of stainless steel was fanned out toward the opposite plate electrode. By intentionally clogging the both end-nozzles and making them as electrodes, the direction was remedied and parallel jets were obtained. According to the increment of applied voltage, jetting mode was varied from dripping mode to stable cone-jet mode. Although the variation of jetting mode was qualitatively the same as that of a single nozzle, for the multi-nozzle the higher voltage was required to obtain the stable jetting mode. Calculated results suggested that the electric field at the tips of the multi-nozzles were lower than that of a single nozzle so that the much higher voltage was required to obtain the same family of jetting mode. From coating experiments on a drum it was demonstrated that the multi-nozzles with dummy electrodes at high applied voltage could jet well-oriented fine droplets to acquire thick and flat film, although the droplets were not uniform. It was confirmed that the coating speed was improved according to the number of the nozzles but the more flowrate was indispensable to obtain thick film
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Document Type: Research Article

Publication date: 2011-01-01

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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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