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A New Method to Assess the Jetting Behavior of Drop-On-Demand Inkjet Fluids

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We present a new experimental method to assess the jetting performance of fluids for use in drop-on-demand (DoD) inkjet printheads. The oblique collision of two continuous liquid jets leads to the formation of a thin oval liquid sheet bounded by a thicker rim which disintegrates into ligaments and droplets. Under certain conditions the flow structure exhibits a remarkably symmetrical ‘fishbone’ pattern composed of a regular succession of longitudinal ligaments and droplets. For a series of model elastic fluids containing polystyrene (PS) in diethyl phthalate (DEP), ejected from nozzles with an internal diameter of 0.85 mm, the shape of the fishbone pattern varies strongly with polymer concentration. The same fluids were used in a Xaar piezoelectric DoD print head to characterize their jetting performance in terms of the maximum ligament length, a crucial parameter in determining the printability of the fluid. There are close similarities between the ligament collapse behaviors in both experiments. Good correlation was found between the maximum included angle of the fishbone pattern and the maximum ligament length in the jetting experiments, which suggests that a test based on oblique impinging jets may be useful in the development of fluids for inkjet printing.
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Document Type: Research Article

Publication date: 2009-01-01

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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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