• 한국인쇄학회지
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• 제29권2호
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• pp.45-58
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• 2011

Gravure off-set printing recently is used in electronics display market. This method has advantages of mass production and high printing speed. It is also fine pattern can be implemented. We have manufactured low-curable conductive Ag pastes for gravure off-set printing. When printing, the pastes be used different silver powder shape because of the printing characteristics. The pastes were prepared with silver powder by silver powder shape and size, epoxy resin, solvent and homogenized on a standard three-roll mill. And the pastes exhibited a shear-thinning flow at viscosity profile. Moreover the adhesive strength and resistivity of silver film had a good characteristics. With the manufactured paste in this study, touch panel had is manufactured and it had $4{\times}10-5{\Omega}.cm$.

• 한국재료학회지
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• 제29권10호
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• pp.639-646
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• 2019

Ink-jet printing is a manufacturing process technology that directly prints a digitalized design pattern onto a substrate using a fine ink jetting system. In this study, environmentally friendly yellow aqueous ceramic ink is synthesized by mixture of distilled water, yellow ceramic pigment and additives for ink-jet printing. The graft polymer, which combines electrostatic repulsion and steric hindrance mechanism, is used as a surfactant for dispersion stability of aqueous ceramic ink. Synthesized ceramic ink with graft polymer surfactant shows better dispersion stability than did ceramic ink with PAA surfactant; synthesized ink also shows desirable ink-jet printability with the formation of a single ink droplet during printability test. Finally, ceramic ink printed on glass substrate and ceramic ink with graft polymer surfactant shows a high contact angle without surface treatment on glass substrate. Consequently, it is confirmed that the ceramic ink with graft polymer surfactant can achieve high printing resolution without additional surface treatment process.

• 한국정밀공학회지
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• 제23권3호
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• pp.102-109
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• 2006

Several methods for PCB pattern inspection have been tried to detect fine detects in pad contours, but their low detection accuracy results from pattern variations originating from etching, printing and handling processes. The adaptive inspection algorithm has been newly proposed to extract minute defects based on movable segments. With gerber master images of PCB, vertex extractions of a pad boundary are made and then a lot of segments are constructed in master data. The pad boundary is composed of segment units. The proposed method moves these segments to optimal directions of a pad boundary and so adaptively matches segments to pad contours of inspected images, irrespectively of various pattern variations. It makes a fast, accurate and reliable inspection of PCB patterns. Its performances are also evaluated with several images.

• 한국표면공학회:학술대회논문집
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• 한국표면공학회 2012년도 추계총회 및 학술대회 논문집
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• pp.72-73
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• 2012

Metal line을 형성하는 방법에는 그라비아 인쇄, 잉크젯 인쇄, photo 공정 후 박막 증착 공정 등을 많이 사용한다. 본 연구에서는 Micro-imprinting 공정과 DFR photo lithography 공정을 통해 음각의 미세한 pattern을 형성한 후 sputtering과 printing을 이용하여 pattern의 filling을 통해 metal line을 구현하는 것을 목표로 하였다. Pattern을 형성한 후 RIE 공정을 통해 기판 표면의 친수성 처리를 하고, SAM 공정을 통해 코팅 막의 소수성 처리를 하였다. Sputtering과 전면 프린팅 및 건조 후 strip 공정을 통해 metal line을 형성하고, 이에 대한 표면 특성과 전기적 특성을 분석하였다.

• 대한기계학회논문집B
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• 제38권8호
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• pp.709-714
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• 2014

리버스 옵셋 인쇄는 인쇄전자를 위한 미세 패터닝기술 중 하나로서 수 ${\mu}m$ 이하의 선폭을 구현할 수 있다. 옵셋 인쇄의 특성상 잉크는 PDMS 재질의 블랑켓에 전사된 후 음각으로 패턴된 클리쉐에 접촉하여 불필요한 패턴을 제거하게 되는데, 이 때 블랑켓은 압력에 의하여 음각 패턴 내부로 침투하는 변형이 발생한다. 이러한 변형은 인쇄 압력에 비례하며, 과도한 인쇄 압력은 넓은 면적의 패턴을 인쇄할 때 클리쉐 패턴의 바닥에 블랑켓이 닿는 불량을 일으키게 된다. 이 논문에서는 리버스 옵셋 인쇄에서 가압변위에 따른 PDMS 블랑켓의 변형을 유한요소기법을 이용하여 모델링하고 접촉압력 대비 변형량을 예측함으로써 실제 인쇄 장비의 실험 결과와 비교하여 인쇄결함이 발생하지 않도록 하는 클리쉐의 제작조건을 제시하고자 한다.

• 한국인쇄학회지
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• 제19권1호
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• pp.42-54
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• 2001

The combination of a silicone surfaced plate and high viscosity ink produced a waterless printing system that worked well, but had limitation. The limitation was that this system was restricted to relatively short run lengths. In the waterless printing process, the press tended to heat up rapidly. Heat in turn, broke down the resins in the inks, causing them to become more fluid. When the ink is heated, the viscosity will drop, the ink will become too liquid and the plate will no longer be able to resist it. The ink will adhere to the non-print portions of the plate, and will print as a very fine mist or speckle pattern in the non-image area. On the other hand, when the ink gets too cold, viscosity will increase until ink transfer is impeded. This study carried otu to investigate the effect of temperature variations of the inks on the print quality in waterless lithography and to examine the adaptability of waterless lithography to conventional offset press without cooling system.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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• pp.1472-1475
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• 2009

The microfluidics channel were fabricated using thermal roll-imprinting process on plastic substrates. As rollimprinting surface is heated directly at $100^{\circ}C$ and printing process proceed 380/400 kgf pressure, we fabricated microfluidic patterns separated line of $40.04{\mu}m$, serpentine line of $113.89{\mu}m$ and depth of imprint pattern is $15.35{\mu}m$, it means to get fine pattern has more than 70% imprint rate in designed mask.

• 복식
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• 제56권6호
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• pp.87-95
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• 2006

This is a study regarding the development of Cultural Products with Applied Koguryo Wadang Patterns. The objective of this study is in developing unique Cultural Products which combine traditional Korean images with modern feel by utilizing Koguryo Wadang patterns. The among Korean traditional patterns which implicit the sense of beauty and modeling, chose and investigated the Wadang patterns of the Koguryo. And from it, studied about the originality and characteristics of the Koguryo Wadang patterns. In this characteristics of the Wadang pattern, the representative lotus design pattern was based and reorganized to fine the probability of the modern expression using traditional patterns. After design plans were made for each works, natural dyes were used to dye(dip dyeing, printing) the fabrics(cotton:Kwang-mok) by theme. Approximately 16 pieces of Cultural Products that can be used in daily life were created using Koguryo Wadang patterns, including Traffic or credit card cases, Name card cases, Pouches, CD cases, Cushions, Bags, Purses, Vest, Muffler. In addition, the increased quality of the products will be a competitive edge in the world market where products compete with no national bounds.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2011년도 춘계학술대회 초록집
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• pp.113.1-113.1
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• 2011

PEMS (printed electro-mechanical system) is fabricated by means of various printing technologies. Passive and active compo-nents in 2D or 3D such as conducting lines, resistors, capacitors, inductors and TFT(Thin Film Transistor), which are printed withfunctional materials, can be classified in this category. And the issue of PEMS is applied to a R2R process in the manu-facturing process. In many electro-devices, the vacuum process is used as the manufacturing process. However, the vacuum process has a problem, it is difficult to apply to a continuous process such as a R2R(roll to roll) printing process. In this paper, we propose an ESD (electro static deposition) printing process has been used to apply an organic solar cell of thin film forming. ESD is a method of liquid atomization by electrical forces, an electrostatic atomizer sprays micro-drops from the solution injected into the capillary with electrostatic force generated by electric potential of about several tens kV. ESD method is usable in the thin film coating process of organic materials and continuous process as a R2R manufacturing process. Therefore, we experiment the thin films forming of PEDOT:PSS layer and active layer which consist of the P3HT:PCBM. The organic solar cell based on a P3HT/PCBM active layer and a PEDOT:PSS electron blocking layer prepared from ESD method shows solar-to-electrical conversion efficiency of 1.42% at AM 1.5G 1sun light illumination, while 1.86% efficiency is observed when the ESD deposition of P3HT/PCBM is performed on a spin-coated PEDOT:PSS layer.

• 한국세라믹학회지
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• 제44권3호
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• pp.157-161
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• 2007

Line width under $100\;{\mu}m$ with good resolution is difficult to achieve using conventional thick-film process utilizing screen printing method. However combined with lithography technology finer line and space for miniaturization and highly integrated package is achievable. In this study, photosensitive Ag paste of optimum formulation used for thick film lithography technology was fabricated by various Ag powder, glass powder and additives. As the result, line width of $30\;{\mu}m$ with good definition and reduced mismatch during co-firing with LTCC substrate was acquired. Formulated Ag paste was used to pattern embedded fine line inductor with over 90% yield.