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Dependence of Ink Jet Dynamics on Fluid Characteristics

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1 Author(s)
Bruce, C.A. ; IBM Research Division Laboratory, Monterey and Cottle Roads, San Jose, California 95193, USA

Measurements of jet velocity, separation length, and stream stability (freedom from random fluctuations in drop position) were made for several fluids, including two inks. The data were then compared with modified fluid flow and jet stability equations. In one case velocity is related to applied pressure drop through a flow equation that depends primarily on the shape and size of the nozzle and on fluid viscosity. In the other case Weber's equation is modified to include forced oscillation, so that separation length is related to the voltage applied to a piezoelectric crystal, to disturbance growth rate, and to velocity. These two equations were applicable to “normal” liquids (those having good stream stability) having viscosities between 0.9 and 4.3 grams/(second · meter) and dynamic surface tensions between 20 and 60 grams/s2, but not to dilute solutions of a high molecular weight polymer, owing to their viscoelastic character. Furthermore, the stream stability of the polymer solutions was poor and depended inversely on concentration and molecular weight.

Note: The Institute of Electrical and Electronics Engineers, Incorporated is distributing this Article with permission of the International Business Machines Corporation (IBM) who is the exclusive owner. The recipient of this Article may not assign, sublicense, lease, rent or otherwise transfer, reproduce, prepare derivative works, publicly display or perform, or distribute the Article.  

Published in:

IBM Journal of Research and Development  (Volume:20 ,  Issue: 3 )