Dynamics of the piezoelectric driven ink jetting

We study the dynamic behavior of inks extracted from piezoelectric inkjet printheads. It is known that ink droplets are ejected from a nozzle when an acoustic wave generated by a piezoelectric film that vibrates applies a sufficient pressure to the ink. This behavior is determined by the size and shape of the ink channel as well as the waveform of the voltage applied to the piezoelectric film. We used commercial software COMSOL to investigate the effect of chamber geometry parameters on the dynamic behavior of ink jet. First, we looked at how acoustic waves propagate through the ink channels for different sized structures. We then observed the change in sound pressure at the nozzle for each case. Finally, we found a condition that caused ink injection. Based on this work, we suggest a design rule of a inkjet print head for a given inkjet speed and volume.