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Squeeze-Type Piezoelectric Inkjet Printhead Actuating Waveform Design Method Based on Numerical Simulation and

Ning Liu1, Xianjun Sheng1, Mingcong Zhang2

  • 1School of Electrical Engineering, Dalian University of Technology, Dalian 116086, China.

Micromachines
|October 27, 2022
PubMed
Summary

This study presents a trapezoidal waveform design for piezoelectric inkjet printheads, optimizing droplet ejection and shape. The method combines simulations and experiments for precise control of conductive graphics production.

Keywords:
actuating waveformcoupled multi-physics fieldnumerical simulationpiezoelectric inkjet printheadpressure variation

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Fluid Dynamics

Background:

  • Piezoelectric inkjet printing is a key technique for creating conductive graphics.
  • Optimizing droplet formation is crucial for achieving high-quality printed features.
  • Existing methods often lack precise control over droplet shape and ejection stability.

Purpose of the Study:

  • To develop a trapezoidal waveform design method for squeeze-type piezoelectric inkjet printheads.
  • To achieve modified steady ejection and optimal droplet shape for conductive graphics.
  • To investigate the influence of waveform parameters on nozzle pressure and droplet formation.

Main Methods:

  • Development of a coupled multi-physics model for a piezoelectric inkjet printhead.
  • Numerical simulations to analyze the effects of rising time, falling time, and dwelling time on nozzle pressure.
  • Optimization of waveform parameters through combined numerical simulations and experimental validation.

Main Results:

  • Optimized trapezoidal waveform parameters (rising time = 5 µs, falling time = 10 µs, dwelling time = 2 µs) yield optimal droplet shape.
  • Droplet size achieved is approximately half the nozzle diameter.
  • Experimental results confirm the efficacy of the proposed waveform design method.

Conclusions:

  • The trapezoidal waveform design method effectively enhances steady ejection and droplet shape in piezoelectric inkjet printing.
  • Combining numerical simulation with experimental validation provides a robust approach for optimizing printhead performance.
  • Ink droplet formation dynamics can be accurately studied by analyzing pressure variations at the nozzle.