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잉크 및 기판 특성 변화에 따른 잉크젯 프린팅 패턴의 형상 분석
신권용(Kwon-Yong Shin),김명기(Myong-Ki Kim),황준영(Jun Young Hwang),강희석(Heuiseok Kang),강경태(Kyungtae Kang),오제훈(Je Hoon Oh),이상호(Sang-Ho Lee) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
Inkjet technology has various merits as a direct patterning process in plenty of industrial applications, but critical issue such as coffee ring effect should be overcome for the application to an industrial manufacturing process. In this paper, we introduced the morphological analysis of inkjet printed pattrerns on the characristics of inks and substrates. In case of Triethlene Glycol Monoethly Ether based ink, the coffee ring effect was observed. However, an ethanol based ink showed the round shaped morphology under the same printing conditions and surface conditions. An ink consisted of the solvent with high boiling point results in coffee ring effect. This experimental results showed that the morphological change of the printed droplet is caused by the main solvent of ink, rather than the metal content, viscosity and surface tension.
잉크젯 기술과 표면처리 기술을 이용한 나노 실버 잉크 프린팅
신권용(Kwon Yong Shin),이상호(Sang-ho Lee),김명기(Myong Ki Kim),강희석(Heuiseok Kang),황준영(Jun-young Hwang),박문수(Moonsoo Park),강경태(Kyungtae Kang) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.11
In this study, characteristics of silver ink-jet printing were investigated under various substrate treatments such as substrate heating, hydrophobic coating, and ultraviolet(UV)/ozone soaking. Fluorocarbon(FC) film was spin-coated on the polyimide (PI) film substrate to obtain a hydrophobic surface. Although hydrophobicity of the FC film could reduce the diameter of the printed droplets, the singlet images printed on the FC film surface showed irregularities in the pattern size and the position of the printed droplet along with droplet merging phenomenon. The proposed UV/ozone soaking of the FC film improved the uniformity of the pattern size and the droplet position after printing and substrate heating was very effective way in preventing droplet merging. By heating of the substrate after UV/ozone soaking of the coated FC film, silver conductive lines of 78 - 116 ㎛ line were successfully printed at low substrate temperatures of 40℃.
에폭시 코팅된 기판위에 잉크젯 인쇄된 실버 패턴의 신뢰성 분석
신권용(Kwon-yong Shin),김영훈(Younghoon Kim),김용욱(Yong-Wook Kim),이민수(Minsu Lee),이상호(Sang-Ho Lee),강경태(Kyungtae Kang) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
The reliability of inkjet printed silver patterns were investigated by the guide lines built up as assessments methods in the production of conventional rigid printed circuit boards. To prepare reliability patterns, different regular test patterns were created by nanosilver colloids inkjet printing on the frame retardent 4 (FR4) or polyimide (PI) substrate coated with epoxy for each of assessment methods. The surface changes were also characterized by the contact angle measurement. The substrate temperature was changed from room temperature to 70 ℃, and droplets from a 50 ㎛ nozzle were printed on the substrate after optimizing the ejection of individual droplets. The reliability analysis methods include the uniformity of line width and space, dielectric withstanding voltage test, adhesive strength, thermal shock test, pressure cooker test (PCT) and bending test.
김명기(Myong-Ki Kim),신권용(Kwon-Yong Shin),황준영(Jun Young Hwang),강경태(Kyungsae Kang),강희석(Heuiseok Kang),이상호(Sang-Ho Lee) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
In this paper, we have studied the bulging phenomenon of ink-jet printed silver lines. The used silver inks are DGP-40LT-15C and DGH-55HTG of Advanced Nano Product (ANP) Company. We investigated the behavior of bulging by changing the polarity of the inks, the surface energy of substrate and droplet spacing in printing. The contact angle of the polar inks increased much more sensitively than the nonpolar ink as the surface energy of the substrate increases. In the case of the nonpolar ink, the bulging phenomenon occurred seriously as the droplet spacing decreased at the constant surface energy.