Abstract
The quality of generated droplets in direct-write inkjet printing strongly depends on the shape of waveform voltages that control the piezoelectric actuators of the inkjet print head. The goal of this study is to investigate the optimal waveform voltage that influences the size and the velocity of ejected droplets to increase the performance of inkjet printing process. In this paper, Jetlab® 4xl inkjet printer with single nozzle of diameter 60 μm is used to control the behavior of Smartink (nanosilver ink) droplets at different jetting parameters. The velocity of droplets is measured at different dwell voltages and dwell times and the relationships between the size of the droplets and dwell time and dwell voltage are investigated. Also, a new method is developed by using Python programming to measure the size of the generated droplets and recognize whether the droplet has a spherical or an elliptical shape, and the result is compared with Aphelion imaging software. Finally, lines are printed at three optimum waveform voltages on PEEK and glass substrates.
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