• 한국진공학회:학술대회논문집
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• 한국진공학회 2014년도 제46회 동계 정기학술대회 초록집
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• pp.252-252
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• 2014

투명전극 제조에 이용되고 있는 진공기반 ITO공정의 제조 단가를 줄이기 위하여 용액 기반의 투명전극 제조 기술에 대한 연구를 수행 하였다. 용액공정을 수행하기 위하여 ITO 나노입자를 이용한 잉크를 제조하고 이를 잉크젯 인쇄공정에 적용하여 ITO 투명전극을 제조하였다. 열처리 온도에 따른 전기적 광학적 특성에 대한 분석을 진행하였다. 전기적 물성의 극대화를 위해 Ag metal grid를 인쇄공정을 통해 제작하고 용액기반 ITO 박막과 융합화(hybridization) 시켰다. Ag metal grid의 line width를 최소화 하기 위하여 전기수력학 방식의 잉크젯 시스템을 사용하여 metal grid를 형성하였고 Ag metal grid는 약 10um의 선폭을 가졌다. 인쇄된 Ag-grid/ITO 박막의 경우 550 nm파장에서(Ag grid pitch: 500 um기준) 약88%의 투과도를 보이며 저항이 $5{\Omega}/{\square}$ 이하의 특성을 나타내었다.

• 한국인쇄학회지
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• 제29권3호
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• pp.1-16
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• 2011

In these days, according to increased environmental regulations, to reduce the VOC content in paints and inks efforts are now in progress. A lot of research have progressed hydrocarbon solvents substitute with vegetable oil or ester in the printing ink but it is restricted to use vegetable oil in the inks because of high molecular weight and viscosity. Oil ester currently developed for printing inks still have some drawbacks, but overall the printability and print quality when using ester than hydrocarbon solvents are showing good results. Thus, in this paper, I studied about the properties variation of the varnish and inks according to vegetable ester, after I reacted vegetable ester using the vegetable fatty acid and ethyl alcohol, butyl alcohol. The compared in order of average molecular weight by the GPC method, rheological properties were found by rotational rheometer, and emulsion behavior were compared by high speed emulsification tester.

• 한국정밀공학회지
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• 제30권6호
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• pp.573-577
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• 2013

The one of the most important issue in roll-to-roll gravure printing is increase of ink transfer ratio or printability. As the result of high ink transfer ratio or printability, we can assess the quality of the printed patterns. The rheological properties are the important factors for the printability of electrodes patterning. In this study, the rheological properties of conductive ink are controlled by adding the solvent. The inks with different rheological properties are used for the patterning of the electrodes of $100{\mu}m$ by gravure printing equipment. The various printing speed, which also affect the rheological properties of conductive ink, is applied and the printed patterns are compared for their width and aspect ratio. Decreasing in the ink viscosity as well as increasing in the printing speed decreases the printability in gravure patterning, which shows that the rheological properties are important factors for the printability of gravure patterning.

• 폴리머
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• 제30권6호
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• pp.550-555
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• 2006

잉크젯프린터용 잉크가 수성화되어 감에 따라 전용 인화지에 사용되는 코팅제 역시 수성 코팅제가 사용되고 있는 추세이다. 이 수성 코팅제에 사용되는 재료를 살펴보면 안료로는 알루미나솔, 주 바인더로 폴리 (비닐 알콜), 부족한 물성을 향상시키기 위해 고분자 첨가제를 사용한다. 된 연구에서 사용된 고분자 첨가제는 스티렌과 부틸아크릴레이트를 기본으로 하구 메타크릴산, 아크릴산, 아크릴 아미드 단량체들을 조합하여 에멀션 중합법으로 합성하였다. 중합시 비이온 및 음이온 유화제를 혼합 혹은 단독으로 사용하고, 단량체 조합과 고분자 첨가제의 입자구조를 변화시켜 흡수성, 퍼짐성, 광학밀도의 인쇄적성과 광택도 내수성 등의 변화를 살펴보았다. 이 결과, 음이온 유화제나 카복실기를 가지는 아크릴산 같이 음이온성이 큰 물질을 사용한 경우 알루미나 솔과의 상용성에서 문제를 야기하였고 아크릴 아미드는 인쇄적성에서 뛰어난 결과를 얻었지만 광택도가 떨어지는 경향을 알 수 있었다. 메타크릴산이 함유된 경우 광택도는 향상되었지만 인쇄적성이 떨어졌다.

• 한국인쇄학회지
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• 제30권1호
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• pp.1-19
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• 2012

According as gradually increasing the demand for eco-friendly at the printing process, it has been progressed fairly development. Especially, the inks are used by soy oil beginning of ink industry for preventing environment, it is possible to make eco-friendly inks with vegetable ester. So it is not necessary to use petroleum-based solvents at all for preventing environment. These eco-friendly inks have a benefits they are able to use the renewable resource. But basically vegetable oils have that reduce the VOC(Volatile Organic Compound) and high viscosity, high solubility properties. So if the vegetable oils use in the ink, set off problem occur on the paper because of slow drying time. In case of vegetable ester, it has similar the molecular weight and kinetic viscosity with hydrocarbon solvent, it is able to control the power of dilution about the resin. So, it has benefit that solve the problem of the existing eco-friendly inks. In this study, different types of ester were made by six types of vegetable oils and used ester in the varnishes and inks properties are comparison with hydrocarbon solvent based ink. By considering the intrinsic properties of vegetable oil, ester used to analyze the changes in ink properties, using ester varnish is applied to study the rheology characteristics and emulsification with inks.

• 한국펄프종이공학회:학술대회논문집
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• 한국펄프종이공학회 2002년도 춘계학술발표논문집
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• pp.101-101
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• 2002

현재의 세계 제지업계는 고지의 사용량과 용수의 재홀용률을 높이기 위해 노력하고있다. 특히 한국의 고지 재활용률은 세계 최고수준으로 보고된 바 있으며, 이를 사용하는 재생용지 생산업채는 고지의 높은 재활용률에 기인하는 여러 가지문제점에 당면하고 있다. 국산 고지는 반복적인 재활용으로인하여 섬유장이 짧고 매우각질화된 상태이며, 펄프 내 미세분 함량이 50%이상에 달하고 있다. 또한 섬유의 표면이 인쇄잉크, stickies 및 각종 이물질로 오염됨에 따라, 섬유자체가 보유하고 있는 섬유간 결합 능력이 저하된 상태이다. 이는 초지시, 탈수성을 악화시켜 생산성을 저하시키며, 탈수성 악화에 기인하여 충분한 고해 과정을 거치지 못하여 생산된 종이의 물리적 성질에 악영향을 미치고 있다. KOCC를 주원료로 사용하는 다겹 판지의 제조공정 또한 재활용 원료의 열악함에 기인한 초지계 내의 과다한 미세분 축적과 이로 인한 탈수성의 저하 및 건조효율의 저하를 막기 힘들었다. 이러한 탈수성 및 건조속도의 저하로 종이 생산 효율의 개선 및 각 물성의 상승을 기대하기 어려웠으며, 이를 개선하기 위하여 다양한 Polyelectrolyte를 첨가하였으나 현저한 효과를 보기 힘들었다. 이에 본 연구에서는 새로운 목질계 부원료인 Lignocell을 사용하여 초지시 탈수성 향상과 건조 촉진, 생산된 종이의 bulk 향상으로 인한 stiffness 등 물리적 성질의 향상효과를 평가하고자 하였다.

• 한국인쇄학회지
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• 제23권2호
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• pp.1-14
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• 2005

Generally, printing inks are composed of pigment, vehicle and additive. Among others, the vehicle transfers the pigment to substrate and then binds it on the surface. So, rheological properties of the vehicle are an important factor which has influence on printability. Thus, in this study, rheology of the vehicle was investigated by using rotational rheometer according to molecular weight of resin. Also, emlusion rheology of water in oil type and its microstructure were examined with increasing the shear rate. Consequently, the following results were obtained: (1) By viscometric flow test, zero shear viscosity and shear thinning index of vehicle increased with increasing the molecular weight of resin. (2) By relaxation and creep test, relaxation time and retardation time of vehicle increased with increasing the molecular weight of resin. (3) By frequency sweep test, crossover point of vehicle increased with increasing the molecular weight of resin. (4) G' and G" of emlusions increased with increasing the molecular weight by amplitude sweep test. (5) The shape of water drop in emlusions was changed to the capillary tube.

• 한국인쇄학회지
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• 제29권1호
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• pp.45-59
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• 2011

According as gradually increasing the demand for Eco-friendly products it has been progressed fairly development at a field of printing and printing inks. The Inks are used by soy oil beginning of ink industry for preventing environment. Now it is possible to make Eco-friendly inks with vegetable ester. So it is not necessary to use petroleum-based solvents for preventing environment. But There is some problems if using vegetable ester to inks. Vegetable ester has high solubility, it causes misting and low viscosity of the Inks. So resin is required high performance. Thus, in this paper, I studied about the properties variation of the Varnish and inks According to using the phenolic modified rosin ester and Soy oil Methyl esters. The compared in order of average molecular weight by the GPC method, rheological properties were found by rotational rheometer, and emulsion behavior were compared by high speed emulsification tester.

• 펄프종이기술
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• 제39권1호
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• pp.25-29
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• 2007

Print mottle is the spotty and cloudy appearance of the ink on the substrate. Print mottle is influenced significantly by the characteristics of the paper with regard to homogeneity of its structure and its coating. The print mottle can be counteracted, in particular by altering the absorption characteristics of the inks, by changing sequence in which the inks are printed, or by using a advanced coated paper. In this study, we investigated the effect of ink dispersion to the print mottle through trial printing test and also analyzed the correlation between properties of coated paper and subjective results by statistic method. The result of this study is expected to be applied the basic data to solve the problem of printing mottle.

• 펄프종이기술
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• 제46권5호
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• pp.1-8
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• 2014

In this study, the influence of the physical properties of ink such as ink dispersity and emulsified amount on the printability of a coated paper was investigated with seven kinds of cyan inks. In addition, two kinds of coating formulations were tested to evaluate the effect of coating structure on the coated paper printability. It was found that the cyan ink with $2{\mu}m$ pigment size had the best dispersibility and hence the ink showed a best ink density on the two kinds of coated papers. When the emulsified ink A with IPA 20 wt% had a lower viscosity than emulsified ink B with IPA 10 wt%, the emulsified ink A showed relatively high value of the ink transfer rate in comparison with emulsified ink B. Despite the high value of ink transfer rate, the coated paper did not show a good printability because those inks with low viscosity due to a strong emulsification were easy to make print mottle on the coated paper.