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Micro-Film Formation by Multi-Nozzle Electrostatic Jets

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Applying micro spray of electrostatic inkjet, precision film coating was examined experimentally. Heretofore, high quality coating was demonstrated with using a single nozzle. A critical issue, however, lies in terms of productivity; the amount of liquid jetted from a single nozzle was too small to obtain sufficiently high coating speed. To overcome the situation, a possibility of multinozzle was investigated in this report. Two types of coating liquids were used, one of which was dilute dispersion and the other was viscous solution. As results, jetting with the dilute dispersion from seven nozzles made of stainless steel was fanned out toward the opposite plate electrode. By intentionally clogging the both endnozzles 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 cone-jet mode. Although the variation of jetting mode was qualitatively the same as that of the single nozzle, the higher voltage was required for the multi-nozzle system. Furthermore, the change of jetting mode and uniform distribution of droplets always started from the end-nozzles. Again, high voltage was required to alleviate the fluctuation of the droplet size. From cylinder coating experiments it was demonstrated that the multi nozzles with dummy electrodes at high applied voltage could jet well-oriented fine and uniform droplets to acquire quality film coating.
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Document Type: Research Article

Publication date: 2010-01-01

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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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