Proceedings of the KSME Conference (대한기계학회:학술대회논문집)
- 2008.11a
- /
- Pages.1742-1746
- /
- 2008
Comparative Study on Ejection Phenomena of Droplets from EHD Jet by Hydrophobic Coating of Nozzle
노즐의 소수성 코팅에 의한 EHD 제트의 액적 토출 현상 비교 연구
- Kim, Yong-Jae ;
- Choi, Jae-Yong ;
- Son, Sang-Uk ;
- Ahn, Ki-Cheol ;
- Keum, Hyun-Joon ;
- Lee, Suk-Han ;
-
Byun, Do-Young
;
- Ko, Han-Seo
- 김용재 (성균관대 대학원 기계공학과) ;
- 최재용 (성균관대 정보통신공학부) ;
- 손상욱 (성균관대 정보통신공학부) ;
- 안기철 (성균관대 정보통신공학부) ;
- 금현준 (성균관대 기계공학부) ;
- 이석한 (성균관대 정보통신공학부) ;
-
변도영
(건국대 항공우주공학과)
;
- 고한서 (성균관대 기계공학부)
- Published : 2008.11.05
Abstract
An EHD (Electro-Hydro-Dynamic) jet for electrostatic inkjet head shows advantages to print micro-size patterns using various inks because it can generate sub-micron droplets and can use highly viscous inks. Thus, many researchers in industrial fields are concerned about the EHD jet in these days. Since the basic principle of the EHD jet is to form a droplet from an apex of meniscus at the end of the nozzle, the ejection mechanism can be changed by the shape of the meniscus. The stable ejection of the droplet is greatly affected by the shape of the meniscus which is also influenced by surface characteristics of the nozzle, electric potential and ink properties. Experiments have been performed using the nozzles with hydrophilic and hydrophobic coatings in this study. The hydrophobic nozzle forms the stable droplets in wider range of the electric potential than the hydrophilic nozzle does.
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