A study of ejection modes for pulsed-DC electrohydrodynamic inkjet printing

Title
A study of ejection modes for pulsed-DC electrohydrodynamic inkjet printing
Authors
이민욱D.K. KangN.Y. KimH.Y. KimS.C. JamesS.S.Yoon
Keywords
Electrohydrodynamic (EHD); Drop-on-demand (DOD); Pulsed DC; Microdripping mode
Issue Date
2012-04
Publisher
Journal of aerosol science
Citation
VOL 46-6
Abstract
For electrohydrodynamic-driven drop-on-demand printing techniques, either continuous-or pulsed-DC voltages can generate drops. To generate uniform micro-drops for high-resolution printing, the pulsed-DC voltage method is superior to continuous-DC voltage methods because of its controllability. Voltage amplitude and duration (or duty cycle or relaxation time, tau) are the primary parameters affecting the performance of drop-generation or ejection. When charge accumulates on the fluid meniscus at the nozzle, a drop is ejected. Charge density is the product of voltage (amplitude) and duration. In theory, charge densities from low-amplitude, long-duration voltages are equivalent to those of large amplitude and short duration. However, we demonstrate that drop-ejection mode differs significantly, despite equivalent products when voltage amplitude and duration change. At various voltage amplitudes and durations, four ejection main modes are identified: microdripping, spindle, string-jet, and spray modes. Longer voltage durations yield excessively large, spindle, string-jet, and spray modes. Conversely, no ejection is observed for short voltage durations. The microdripping mode, most desirable for uniform and high-resolution printing, appears for the narrowed range of duration under given pulsed-voltage. The identification map has been constructed for these modes; this map can be used as a guideline to yield a stable microdripping mode for high quality printing.
URI
http://pubs.kist.re.kr/handle/201004/66131
ISSN
0021-8502
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KIST Publication > Article
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