Abstract Scope |
Piezo drop-on-demand (DOD) inkjet is a non-contact and direct forming technique for pattern fabrication, which has been widely used in additive manufacturing, biochip, flexible displays, MEMS components, and optical devices. It is known that the droplet ejection behavior differs by ink properties and the driving waveform. In this paper, we present a model for the droplet formation dynamics from a single nozzle with a bipolar driving signal, which provides a quantitative relationship between the waveform of the driving signal and the average jetting velocity at the nozzle exit, droplet ejection frequency, and droplet volume. An experimental setup is developed for calibration and validation of the model. Results show the model agrees well with experiments and can be used to predict inkjet printing speed based on the parameters of the driving signal. |