• 반도체디스플레이기술학회지
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• 제9권2호
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• pp.103-109
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• 2010

An ink transfer is modeled and experimentally verified using roll-to-roll electric direct gravure printing process. The ink transfer model based on the physical mechanism for the maximum ink transfer rate is proposed, and experimented by the electric printing machine in FDRC for the relations of the maximum ink transfer rates to the printing pressure, the operating speed, the operating tension, the surface roughness of substrates, and the contact angle between substrate and silver ink. The free ink split coefficient and immobilized ink under the maximum ink transfer rate are calculated by the physical parameter in a printing process and contact angle between substrates and ink. Numerical simulations and experimental studies were carried out to verify performances of the proposed ink transfer model. Results showed that the proposed ink transfer model was effective for the prediction of the amount of transferred ink to the substrate in a direct gravure printing systems.

• 한국전기전자재료학회논문지
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• 제26권6호
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• pp.462-467
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• 2013

In this paper, we analyzed the effects of doctoring process on the patterns of Ag ink in gravure off-set printing. The parameters of doctoring process were the angle and the pressure, which was represented by the depth of blade movement to the gravure roll, of doctor blade to the surface of gravure roll, and the angle of patterns engraved on the gravure roll to the doctor blade moving direction. The proper parameters were extracted for the fine patterns and they were 15 mm for the pressure, $60^{\circ}$ for the blade angle. And the angle of patterns with respect to the blade movement should be less than $40^{\circ}$ for the best results. The gravure off-set printing with the above parameters was carried out to print gate electrodes and scan bus lines of OTFT-backplane for e-paper. The line width of $50{\mu}m$ was successfully obtained. The thickness of electrodes was $2.5{\mu}m$ and the surface roughness was $0.65{\mu}m$ and the sheet resistance was $15.8{\Omega}/{\Box}$.

• 한국인쇄학회지
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• 제25권1호
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• pp.53-64
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• 2007

Gravure printing is the most useful printing process than any other engraving printing method. According to the cell which is variable size and depth, ink is transferred substrates. So, the amount of ink from cells has a great effect on the qualities of final printed products. The variables effect on the printability of final products are proportion of the width and length, the rhelogical properties, roll speed etc. However the mechanism of gravure is difficult to study scientifically because of high speed and excessively small size of the cell. To approach the mechanism we experimented the real test by using gravure printability. The condition of variables of IGT is pressure and velocity. By using Polyflow 3. 10. 0 simulation software, we built up the theoretical model under the constant variables. Then, we compared the real test with the simulation results. Therefore, it is studied the mechanism of gravure scientifically and it can be analysed the effect of the variable conditions.

• 한국인쇄학회지
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• 제30권2호
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• pp.23-33
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• 2012

With the development of many display technologies currently applied to them in the field of printed electronics, there have been many researches that high resolution printing for thin and uniform pattern. In this paper, printing ink flow properties in the reverse offset mechanism were simulated. The aim of this research is to expect the ink flow behavior between cliches to make fine pattern by a printing technique which is a reverse offset. The simulation results show that almost the same as the experiments and the flow behavior according to the ink film thickness and printing pressure changes could be expected.

• 마이크로전자및패키징학회지
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• 제18권4호
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• pp.71-77
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• 2011

표면실장형 수동소자인 0402, 0603, 1005 칩에 대한 인쇄 주요인자 결정 및 공정 최적화를 실험계획법을 통해 실시하였다. 실험에 사용된 솔더는 Sn-3.0Ag-0.5Cu와 Sn-0.7Cu이며, 공정변수로는 스텐실 두께, 스퀴지 각도, 인쇄 속도, 기판분리 속도, 스텐실과 기판간의 갭이며, 인쇄압력은 2 $kgf/cm^2$로 고정하였다. 분산분석을 통해 인쇄효율에 영향을 미치는 주요인자가 스텐실 두께와 스퀴지 각도임을 확인할 수 있었다. 주요인자인 스텐실 두께와 스퀴지 각도를 변화시켜 인쇄효율의 최적화 영역을 확인하였고, 0402, 0603, 1005 칩 모두 스퀴지 각도가 $45^{\circ}$ 이하일 경우 인쇄효율이 높았다. 스텐실 두께를 변화할 경우 칩 크기에 따라 인쇄효율이 다른 양상을 보였는데, 0402, 0603 칩에서는 스텐실 두께가 얇을수록 높은 인쇄효율을 보였으며, 1005 칩에서는 스텐실 두께가 두꺼울수록 높은 인쇄효율을 나타내었다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회A
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• pp.1806-1809
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• 2008

Study that form micro pattern by direct ink jet printing method is getting attention recently. Direct ink jet printing spout fine droplet including nano metal particle by force or air pressure. There is reason which ink jet printing method is profitable especially in a various micro-patterning technology. It can embody patterns directly without complex process such as mask manufacture or screen-printing for existent lithography. In this study, research of a technology that ejects fine droplet form of Pico liter and forms metal micro pattern was carried with inkjet head of piezoelectricity drive system. Droplet established pattern while ejecting consecutively and move on the surface at the fixed speed. Patterns formed in ink are mixed with organic solvent and polymer that act as binder. So added thermal hardening process after evaporate organic solvent at isothermal after printing. I executed high frequency special quality estimation of CPW transmission line to confirm electrical property of manufactured circuit board. We tried a large area printing to confirm application possibility of an ink jet technology.

• 펄프종이기술
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• 제38권1호통권113호
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• pp.27-33
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• 2006

Newsprint is quantitatively the most important printing paper. The demands for its printability are continuously increasing. It is well known that the relationship between the physically tested paper properties and newspaper printability is unsatisfactory. In order to improve the printing quality of Korean newsprint, the printability coefficients such as maximum ink requirement(Ymax), print through were investigated. Kinds of newspapers and black printing ink were tested by IGT printability tester. Experiment condition of IGT printability tester was 14 steps between $0.2{\sim}2.8g/m^2$ of ink requirement, printing pressure was 200 N and printing velocity was 1 m/sec. The properties of newspaper samples (basis weight, bulk density, roughness, smoothness, porosity, i. e.) were examined in accordance with KS and TAPPI standard testing methods. The result of this study are respected for usefulness printing quality management of Korean newsprint.

• 펄프종이기술
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• 제46권3호
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• pp.1-10
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• 2014

Offset paper printing is a promising roll-to-roll technique for color printed materials. Although it is no doubt that understanding ink transfer mechanism in offset printing process is necessary to achieve high printing quality, investing the relationship between inks and substrates at the nip is difficult experimentally due to high printing speed. In this paper, rheological behavior and splitting point of the ink at the nip is studied using package software Ployflow and Flow 3D based on Navier-Stokes equation. Polydimethylsiloxane (PDMS) ink and IGT printability tester were used for an model ink and experiment to compare with that of simulation data, respectively. As a result, higher viscosity at state flow and pressure increased ink transfer due to higher possibility of presence of cavitation at the nip and increase in covering area ratio. These results have shown good agreements with experimental data compared by measuring density of print through.

• Korean Chemical Engineering Research
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• 제54권3호
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• pp.285-292
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• 2016

삼차원 프린팅(3D printing) 기술은 공학, 제조업, 교육, 예술, 그리고 바이오의학 같은 다양한 분야에 활용되고 있는 혁신적 기술이다. 프린팅 기술, 재료/생화학물질을 포함한 최근 기술의 진보는 생체적합성 물질, 세포, 지지체 성분의 3D 프린팅으로 복잡한 3D 기능성 조직과 장기를 제작할 수 있는 가능성을 보여주고 있다. 3D 바이오프린팅 기술은 신약 개발, 독성 연구를 위한 조직 모델의 제작에도 활용되고 있다. 3D 바이오프린팅 기술은 공학, 생체재료과학, 세포생물학, 생화학, 물리, 의학 같은 분야의 통섭이 필요한 연구 분야이다.

• 한국정밀공학회지
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• 제24권8호통권197호
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• pp.74-80
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• 2007

The distortion of printed pattern is frequently observed in gravure offset printing process, which can be a serious problem in printing process for printed electronics. The mechanism of pattern distortion is studied and the factors which affect the amount and shape of distortion are found using FEM. The amount and shape of distortion is influenced by material properties of the roller, thickness of roller, applied load, and so on. As the printing pressure increases and Possion ratio increases, the degree of the image distortion increases. And the increase of the thickness of rubber roller brings a large distortion of image, too. In some cases, the distortion of printed pattern can reach a few hundred micromillimeters. The comparison of the experiment result and the simulation result shows good agreement in their quantitative tendency.