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A highly efficient method and apparatus for eliminating satellite drops over a wide range of wave numbers in the operation of an ink jet head is described.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
83% of the total text.
Page 1 of 1
Elimination of Satellites in the Synchronous Breakup of a Liquid Jet
A highly efficient method and apparatus for eliminating satellite drops over a
wide range of wave numbers in the operation of an ink jet head is described.
When a periodic disturbance of a pure sinusoidal waveform is applied to a
liquid jet and, if the wavelength of the disturbance is greater than the
circumference of the jet, the disturbance grows in time and breaks the jet into
synchronized main drops with one or more satellite drops. The presence of the
satellite drops is undesirable in many applications.
It can be shown that when the wave number (K) of the fundamental
frequency is in the range when the surface waves grow (K<l) and, further, if the
initial disturbance applied to the jet is sufficient so that the growth rate is
exponential, all the harmonics included with the fundamental or generated by the
fundamental will have exponential growth along with that of the fundamental.
When an initial disturbance consisting of a pure fundamental (F) and a third
harmonic (3F) is applied to a jet, with the third harmonic in phase with the
fundamental and having an amplitude about 10 percent of the fundamental, the
jet will break up so that no satellite is formed. By applying suitable amounts of
third harmonic, satellite drops can be eliminated over a sufficiently wide range of
Harmonics higher than the third can also be included along with the
fundamental and, by suitably adjusting th...