• Title/Summary/Keyword: Ink transfer

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A Study on the Ink Transfer Using the Roughness and Substrate Energy of Substrate in Roll to Roll Printing Systems (롤투롤 인쇄 시스템에서의 기판 소재의 거칠기와 표면에너지를 이용한 잉크 전이에 대한 연구)

  • Shin, Kee-Hyun;Kim, Ho-Joon
    • Journal of the Semiconductor & Display Technology
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    • v.9 no.2
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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.

Analysis of Ink Transfer Mechanism in Gravure-offset Printing Process (그라비아 옵셋 프린팅 공정에서의 잉크전이 메커니즘 해석 연구)

  • Lee, Seung-Hyun;Nam, Ki-Sang;Lee, Taik-Min;Yoon, Deok-Kyun;Jo, Jeong-Dai
    • Journal of the Korean Society for Precision Engineering
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    • v.28 no.10
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    • pp.1146-1152
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    • 2011
  • Ink transfer process is very important to determine quality of printed pattern, therefore its mechanism should be understood to control printing quality. Although there have been many attempts to understand ink transfer mechanism by numerical simulation and experimental studies, their model was too much simple to model realistic printing process and our understanding is not enough yet. In this paper we designed ink transfer visualization system to present flow visualization of ink transfer process for gravure offset printing. We considered rotational effect of blanket roll which is related with printing speed and used non-Newtonian fluid as working fluid such as Ag paste. For printing unit, cantilever-type blanket roll is used for convenient visualization of ink transfer. Serial images were captured continuously by using high-speed CMOS camera and long range microscope. We investigated the effects of various design parameters such as printing speed and pattern angle on the ink transfer process. We found more stretched ink filament for non-Newtonian fluid than Newtonian fluid. As increasing printing speed, length of stretched ink filament and height of break-up point are also increased. We also compared ink transfer process between CD and MD pattern and its relationship with ink transfer mechanism.

A Study on Photolysis of Aromatic Diazonium Salt (방향족 디아조늄염의 광분해에 관한 연구)

  • 이형관
    • Journal of the Korean Graphic Arts Communication Society
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    • v.12 no.1
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    • pp.93-105
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    • 1994
  • A new ink transfer model based on the physical mechanism for the maximum ink transfer rate is proposed, and examined by the experimental data of P.J Mangin et, al. for the relations of the maximum ink transfer rates to the printing pressure, the speed and the roughness of paper substrates. The free ink split coefficient and immobilized ink under the maximum ink transfer rate are calculated by the new model and the experimental data. It is concluded that the new model is very useful, and the free ink split coefficient and the immobilized ink are inversely propotional and propotional to the paper roughness respectively and both are saturated eventually under the critical values.

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Study of Liquid Transfer Process for micro-Gravure-Offset Printing (마이크로 그라비아 옵셋 프린팅에서의 유체 전이 공정에 관한 연구)

  • Kang, Hyun-Wook;Huang, Wei-Xi;Sung, Hyung-Jin;Lee, Taik-Min;Kim, Dong-Soo
    • Proceedings of the KSME Conference
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    • 2008.11a
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    • pp.1098-1102
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    • 2008
  • To increase the ink transfer rate in the micro-gravure-offset printing, the liquid transfer process between two separating plates is investigated. During the liquid transfer process, in which one plate is fixed and the other one moves vertically, a sessile droplet is separated into two droplets. The volume ratio of the two droplets depends on the contact angles of the two plates. In a numerical study of the ink transfer processes, liquid transfer between two parallel separating plates and between a trapezoidal cavity and an upward moving plate are simulated, as models of the printing of ink from the offset pad onto the substrate and the picking up of ink from the gravure plate by the offset pad, respectively. Also, in experimental study, to obtain various surface contact angles, chemical treatment, plasma treatment, and electrowetting- on-dielectric (EWOD) surface are considered. The transfer rate between two plates is calculated by analyzing the droplet images. From the results, the optimal surface contact angles of the units of the micro-gravure-offset printing can be characterized.

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The Study of Structure Recovery According to the Concentration of the Calcium Carbonate for Ink (탄산칼슘 함량에 따른 잉크의 구조 회복성 변화에 관한 연구)

  • Lee, Kuy-Il;Kim, Sung-Bin;Cho, Jin-Woo
    • Journal of the Korean Graphic Arts Communication Society
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    • v.21 no.1
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    • pp.1-10
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    • 2003
  • Printing ink is faced various shear stress situation until it transfer to the printed substrate through the press. And in each shear stress condition the ink is needed to keep the appropriate viscosity according to the condition. The change of printing ink viscosity has been explained by well-known through the viscosity profile curve. But actually, the quality of printed paper depends on the ink behavior after transfer the substrates. Like this, to look into the behaviour of the ink on the printed substrate, it is needed the experiment of the ink structure recovering by rheology study. In this study, by controling the $CaCO_3$ content in the ink, after investigating the effect of the ink's structure recovery of the pigment concentration, we intend to predict the printing quality of the ink behvior on the substrate depending on pigment content.

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Evaluating Interfacial Force between Viscoelastic Ink and Substrate in Gravure Printing Process (그라비아 프린팅 공정에서 점탄성 잉크와 기판의 계면접착력 평가)

  • Yu, Milim;Ahn, Kyung Hyun;Lee, Seung Jong
    • Korean Chemical Engineering Research
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    • v.53 no.1
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    • pp.111-115
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    • 2015
  • To produce patterns with high resolution in gravure printing, it is important to increase ink transfer ratio. The ink which has higher affinity with substrate can be transferred more from the roll to the substrate due to the good wettability between ink and substrate. However, it is difficult to evaluate the affinity between the substrate and the ink which is viscoelastic in nature. In this study, we suggest a practical method to evaluate the interfacial interaction between the ink and various substrates.

Influence of the Variation of the Coating Color Composition and Characteristics of Inks on the Printability of the Coated Paper (도공액 조성변화와 잉크 물성변화가 인쇄품질에 미치는 영향)

  • Koo, Chul-Whoi;Ha, Young Baeck
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.46 no.5
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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.

The Rheological Properties of Printing Ink and its printability with the Molecular Weight of Rosin Modified Phenol Resin (로진 변성 페놀 수지의 분자량 변화에 따른 인쇄 잉크의 유변학적 특성과 인쇄적성에 관한 연구)

  • Lee, Kyu-Il;Kim, Sung-Bin
    • Proceedings of the Korean Printing Society Conference
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    • 2007.11a
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    • pp.1-12
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    • 2007
  • The rheological properties of an ink relate to its performance on the press and to the printing quality. So it is necessary to analyze the relationship between printability and the rheological properties of ink. Transfer rate of ink is one of the important factor deciding print quality. And it is concerned with rheological properties of ink. Thus, in this study, according to the molecular weight of rosin modified phenolic resin the rheological properties of ink were measured by rotational rheometer and then transfer equation of ink, density and gloss were mesured in order to examine the printability of ink.

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The Study of Rheological Properties of Emulsified Ink and Printability (유화된 잉크의 레올로지 특성과 인쇄적성에 관한 연구)

  • Kim, Jin-Woo;Kim, sung-Bin;Kim, Tae-Hwan;Lee, Kyu-Il
    • Journal of the Korean Graphic Arts Communication Society
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    • v.22 no.2
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    • pp.1-12
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    • 2004
  • In lithography based on repulsion of ink and water emulsification is inevitably generated. Thus it is necessary to analyze relationship between printability and physical and chemical properties of emulsified ink. Transfer rate of ink is one of the important factor deciding print quality. And it is closely concerned with rheological properties of emulsified ink. Rheological properties such as flow, yield, plastic viscosity, creep, oscillation and tack tests were measured. In order to examine printability of emulsified ink, ink transfer equations, density, ink film thickness and gloss were measured.

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