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Influence of Nozzle Defects on Drop-on-demand Ink-jets

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The effects of nozzle defects on the behaviour of drops ejected from drop-on-demand print-heads were studied. Nozzles in two types of commercial print-heads were modified with two different micromachining techniques: focused ion beam (FIB) milling and pulsed laser micromachining. Nozzles were modified by producing single or multiple notches on their edges. The studies focused on the volume, speed and direction of travel of the drops. Fifteen different types of geometrical defects on 128 nozzles were studied. Shadowgraph images captured with short high time resolution were used to determine the drop size, speed and trajectory from the same nozzles before and after modification. The results indicate that geometrical defects up to ∼100 μm2 at the front (exit) face of a 50 μm diameter nozzle do not cause any significant variation on the behaviour of these nozzles but that defects at the back (entry) of the nozzle can have a major effect on the direction of jetting.
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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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