Viscosity Effect on Piezoelectric Actuated Nozzle in Generating Micro Droplet

Abstract

nkjet printing has proven to be a promising and flexible process methodology for low cost and drop-on-demand pattern formation in small-scale devices with a functional material. In this paper, micro droplet deposition using 80 micron diameter nozzle with micro piezoelectric printhead was investigated using a mixture of three fluids, distilled water (DW) and solutions of two different percentage of glycerine (G) as an operating fluids. The droplet formation capability and stability was studied according to the influence of pulse amplitude, dwell time and fluid viscosity. The results show that the optimal drop velocity to obtain a stable printing range from 0.5 ~1.5 ms-1 which corresponds to pulse amplitude range of 25 to 100V and dwell time 15 to 35 μs. Respectively droplet formation and dispensing performance give benefit in dispensing application and build a solid background to inkjeting functional polymer material.

Performance Enhancement of Inkjet Printed Multi‐Walled Carbon Nanotubes Inks using Synthetic and Green Surfactants

“…[ 39 ] Advantageously, Printer B with piezoelectric head allows adjustment on the printing parameters to be done such as pulse time, frequency, printhead temperature and voltage, thus make it more effective in controlling the drop behavior. [ 40 ] Investigation on its operation parameters showed that the optimum droplet velocity to obtain a stable ejection profile is ≈1.2 m s −1 , which is lower than that of Printer A (≈2 m s −1 ). As opposed to Printer B, Printer A used in the present work introduces a constraint in manually controlling those parameters and with the high droplet velocity, the printing quality will be affected to a great extent.…”