Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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Study on the Highly Viscous Fluid Ejection Pressure of Magnetostrictive Inkjet Head

자기변형 잉크젯헤드의 고점도 유체 토출 요구 압력에 관한 연구

  • Oh, Ock Kyun (Department of Mechanical Design & Mechatronics Engineering, Graduate School, Chungnam National University) ;
  • Park, Young-Woo (Department of Mechatronics Engineering, Chungnam National University)
  • 오옥균 (충남대학교 대학원 기계설계.메카트로닉스공학과) ;
  • 박영우 (충남대학교 메카트로닉스공학과)
  • Received : 2014.12.19
  • Accepted : 2015.03.24
  • Published : 2015.04.01
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Abstract

This paper presents ejection of high viscosity fluids with magnetostrictive inkjet printhead(Magjet), which is not common with any other printhead. The MagJet uses a magnetostrictive material, Terfenol-D rod with 10-mm in diameter and 50-mm in length, as an actuation mechanism. It has been known that high viscosity is often an obstacle in ejecting small and mono-disperse droplets. We calculated required pressure with fluidic inertia (Bernoulli equation) and viscous loss (Hagen Poiseuille equation). The required pressure for ejecting a droplet is 1300kPa. The generated force and displacement with Terfenol-D rod are estimated to be 480N (2600kPa) and $28{\mu}m$, respectively. It was enough that Magjet eject high viscosity fluid (Max 1000cP). The experiments are performed to eject the high viscosity fluid with Magjet. The ejection of high viscosity fluids is successful with the aid of Terfenol-D's high performance.

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References

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