Abstract Scope |
Piezo inkjet has been widely used in a wide variety of industrial applications due to its robustness and insensitivity to ink chemistry. The driving signal plays a major role in droplet generation, such as droplet size, velocity, pinch-off time, satellites, and ultimately printing speed and quality. This paper aims to establish a model and provide a fundamental understanding of the effects of the driving signal on the printing speed. In this paper, we developed an analytical model of how ejection velocity changes with time during the jetting process, and derived the effects of the driving signal parameters on the droplet volume and pinch-off time, which are two main factors of printing speed. The model is calibrated and validated with a custom experimental setup, which is equipped with a high-speed camera to capture the droplet formation dynamics for the study. Results show that the model prediction agrees well with experimental results. |