Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Characteristic Analysis of High Speed Inkjet Printing Head for Digital Textile Printing

디지털날염용 고속 구동형 잉크젯 프린팅 헤드의 특성해석

  • Lee, Duck-Gyu (Department of Nature-Inspired Nanoconvergence Systems, Nanoconvergence Mechanical System Division, Korea Institute of Machinery & Materials) ;
  • Hur, Shin (Department of Nature-Inspired Nanoconvergence Systems, Nanoconvergence Mechanical System Division, Korea Institute of Machinery & Materials)
  • 이덕규 (한국기계연구원 나노융합기계본부 나노자연모사연구실) ;
  • 허신 (한국기계연구원 나노융합기계본부 나노자연모사연구실)
  • Received : 2018.11.08
  • Accepted : 2018.11.28
  • Published : 2018.11.30
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Abstract

To develop a piezoelectric inkjet printhead for high-resolution and high-speed printing, we studied the characteristics of an inkjet printhead by analyzing the major design parameters. An analytical model for the inkjet printhead was established, and numerical analysis of the coupled first-order differential equation for the defined state variables was performed using state equations. To design the dimension of the inkjet printhead with a driving frequency of 100 kHz, the characteristics of the flow rate and discharge pressure of the nozzle were analyzed with respect to design variables of the flow chamber, effective sound wave velocity, driving voltage, and voltage waveform. It was predicted that the change in the height of the flow chamber does not significantly affect the Helmholtz resonance frequency and discharge speed of the nozzle. From the analysis of change in flow chamber width, it is observed that as the width of the flow chamber increases, the ejection speed greatly increases and the Helmholtz resonance frequency decreases considerably, thereby substantially affecting the performance of the inkjet printhead.

Keywords

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Fig. 1. Structure of Piezo Inkjet Print Head

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Fig. 2. Two-Port Model of Inkjet Head

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Fig. 3. Equivalent Inkjet Print Head Model

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Fig. 4. Structure model of inkjet printhead

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Fig. 5. Shape of voltage waveform

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Fig. 6. Nozzle pressure and jetting velocity according to height variation of flow chamber. (a) Nozzle pressure, (b) Jetting Velocity

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Fig. 7. Nozzle pressure and jetting velocity according to width variation of flow chamber. (a) Nozzle pressure, (b) Jetting Velocity

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Fig. 8. Jetting velocity according to variation of effective wave velocity

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Fig. 9. Jetting velocity according to voltage variation

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Fig. 10. Shape variation of waveform

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Fig. 11. Jetting Velocity according to variation of waveform

Table 1. Structure dimensions of Inkjet head

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Table 2. Material properties of structures

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Table 3. Material properties of ink

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References

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