Optimization of the driving waveform of a piezoelectric inkjet printhead based on a system dynamics model

Abstract

Purpose This paper aims to present an optimization method of the input driving signal of a piezoelectric inkjet printhead to improve droplet consistency and increase jetting frequency. Design/methodology/approach The optimization target is the transient pressure in the nozzle caused by the input driving signal, which directly generates the droplets. After demonstrating the linearity of the driving input and system pressure, an analytic model as a transfer function was developed, allowing calculation of the pressure vibration in the nozzle for an arbitrary input. Different patterns of input signal were parameterized and applied into the optimizing function, which represents the difference between the ideal and the actual pressure vibration. By determining the function minimum, the optimized parameters of the input signal were estimated. Findings Optimization results of different input patterns were compared and verified by the numerical model of the printhead, and it was revealed that the optimization method that combined the quenching pulse and an increased falling time interval was more effective than use of a single method. Originality/value After the process of optimization, a new type of input signal to the piezoelectric inkjet printhead was showed. By this method, the frequency of the printhead could be increased without losing consistency of droplets.

Green Technology Implementation Model for Sustainability

“…In this framework, there are five important elements needed to realise the implementation of green information technology, which are (1) attitude, (2) policy, (3) practice, (4) technology, and ( 5) governance. G-Readiness represents the combination needed by the organisation to enable it to use environmental resources in a sustainable manner [15].…”

Study on driving waveform design process for multi-nozzle piezoelectric printhead in material-jetting 3D printing

“…Literature in driving piezoelectric printhead were mostly using single-nozzle printhead to jet inks (Kwon, 2009b;Shin et al, 2011;Kwon et al, 2016;Liu et al, 2013;Kwon, 2010;Wang and Xi, 2018), while few were adopting multi-nozzle printheads (Kwon and Kim, 2007;Khalate et al, 2012;Ezzeldin et al, 2013;Oktavianty et al, 2019). The printing quality is related to jetting behavior, which is affected by the combined effect of the driving waveform and the ink properties (Liu et al, 2013).…”