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Proceedings Paper

Droplet Formation And Shape At High Velocities In A Drop-On-Demand Ink Jet
Author(s): Sargit S. Bupara; Stuart D. Howkins
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Paper Abstract

Typically, drop-on-demand ink jets have been operated so as to form a nearly spherical droplet in flight prior to impingement on the substrate being printed. Generally, this condition is obtained very near to the threshold at which droplets are just formed and the jetting velocities are of the order of 3 to 5 m/s. In the Dataproducts ink jet device, jetting velocities are of the order of 10 to 13 m/s. In this case, the element of ink that impinges on the substrate to form a dot is comprised of a leading, nearly spherical head followed by a relatively thin elongated tail (a "ligament") moving at a somewhat slower speed than the head. There are advantages to this high-velocity mode of operation including minimization of dot placement error, improved droplet aim, and reduced susceptibility to crosstalk effects on jet velocity. In this paper, discussions and strobe-illuminated photographs of the ligament formations and droplet shapes are presented. The potential consequences for jet performance and print quality with such droplet shapes are also discussed.

Paper Details

Date Published: 6 July 1989
PDF: 9 pages
Proc. SPIE 1079, Hard Copy Output, (6 July 1989); doi: 10.1117/12.952826
Show Author Affiliations
Sargit S. Bupara, Dataproducts Corporation (United States)
Stuart D. Howkins, Dataproducts Corporation (United States)

Published in SPIE Proceedings Vol. 1079:
Hard Copy Output
Leo Beiser; Stephen L. Corsover; John M. Fleischer; Vsevolod S. Mihajlov; Ken-Ichi Shimazu, Editor(s)

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