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

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Abstract:

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.

Document Type: Research Article

Publication date: January 1, 2010

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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