• Title/Summary/Keyword: IGT

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The effects of ink dispersion and printing condition on the printed mottle (잉크 분산 및 인쇄조건이 인쇄 모틀에 미치는 영향)

  • Ha, Yeong-Baek;Kim, Chang-Keun;Lee, Yong-Kyu
    • Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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    • 2006.04a
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    • pp.152-157
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    • 2006
  • Printing mottle of coated paper is one of the most common and the most difficult problems in offset printing. For a high quality printing, development of new paper coating technologies to prevent print mottle is required. This research focused on improvement of printing mottle. Effects of base paper properties, coating color composition and printing conditions such as printing pressure and printing speed on printing mottle were investigated with RI tester and IGT tester.

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A Study on the Simulation of Ink Penetration into the Uncoated Papers in Gravure Printing (그라비어 인쇄에서 비도피지의 잉크 침투 시뮬레이션에 관한 연구)

  • Seo, Yea-Ri;Youn, Jong-Tae
    • Journal of the Korean Graphic Arts Communication Society
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    • v.28 no.1
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    • pp.1-13
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    • 2010
  • Gravure printing and manufacturing of advanced electronic components in a way that is going extra hold position. It is to print the electronic components of the rapid productivity improvements as well as cost-saving and environment-friendly industries such as the transition is a big advantage. 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 using gravure printability. The condition of variables of IGT is pressure and velocity. By using Flow-3D 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.

The Local Surface Strength Variation of Coated Papers during Printing (인쇄과정에서 코팅 용지의 국부적인 표면강도 변화에 관한 연구)

  • Youn, Jong-Tae
    • Journal of the Korean Graphic Arts Communication Society
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    • v.22 no.2
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    • pp.101-110
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    • 2004
  • The local surface strength variation of coated papers were measured at various speeds on a number of coated paper samples to study the effects of speed and ink tack on coating pick. Coating pick phenomenon is observed in an ink transfer variation curve as a decrease in the slope of the curve. On the other hand, it causes an actual decrease in net ink transfer to paper with an increase in speed. The effect of speed on coating pick depends on ink tack, ink film thickness and surface properties of coating layer formation of paper. A novel device to measure the surface strength can rate the coating paper in a different order. Comparison are made between dry test of coating paper pick and wet coating pick test of printing in IGT printability tester. Coating formulation is the main key to prevent from coating pick. The binder level increases, the coating pick and the slop decrease. The piling on blanket in printing is a problem when the coating pick is occur on a local area rather than average surface strength of coated papers.

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Effect of surface area of Lake Red C pigment and solvent contents in inks on the physical properties of printing inks (Lake Red C 안료의 표면적과 용매함량이 인쇄잉크의 물성에 미치는 영향)

  • 김종래
    • Journal of the Korean Graphic Arts Communication Society
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    • v.15 no.1
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    • pp.17-30
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    • 1997
  • In this work, we have investigated the printability such as print through and str-off of domestic newspapers. Nine kinds of domestic newspapers Hansol, Deahan, Sinho, Hanla and Sepung, were tested by IGT printability tester, and studied using maximum ink requirement method. We obtained the datum of printability parameters such as maximum ink requirment of paper Ymax, printing density D, print through, set-off and gloss. The results of this test showed that a choice of the fillers on the newspaper had an effect on print through, set-off and density of newspapers in the maximum ink transfer point.

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A Study on the Depth of Ink Penetration according to the Printing Pressure in Domestic Newsprint Paper (국산 신문 용지의 인쇄 압력에 따른 잉크 침투 깊이에 관한 연구)

  • Yoo, Jae-Hyun;Baik, Yong-Kug;Youn, Jong-Tae
    • Journal of the Korean Graphic Arts Communication Society
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    • v.27 no.1
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    • pp.59-71
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    • 2009
  • Measuring ink penetration is one of the best ways to know paper printability. Ink penetration was effected by physical properties of newsprint paper. This study was carried out for the purpose of improvement printability with ink penetration of domestic newsprint paper. The samples were prepared by means of 20 newsprint paper manufacture company in Korea, and were tested by IGT printability tester. The results of this experiments showed that the depth of ink penetration according to the printing pressure. The maximum points in ink transfer curve and the coefficients of oil absorption of the papers also depend mainly upon the situation of anchor points.

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A Study on the Rate of Ink Penetration of Korean Newspapers (국산 신문용지에서 잉크침투속도 변화에 따른 인쇄적성에 관한 연구)

  • Kim, Jong-Kyoung;Youn, Jong-Tae
    • Journal of the Korean Graphic Arts Communication Society
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    • v.24 no.1
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    • pp.67-76
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    • 2006
  • Measuring ink penetration is one of the best ways to know paper printability. Ink penetration was effected by physical properties of newspapers. This study was carried out for the purpose of improvement printability with ink penetration of Korean newspapers. The samples were prepared by means of 7 Newspaper manufacture company in Korea, and were tested by IGT printability tester. The results of this experiments showed that the rate of ink penetration, roughness and porosity are proportioned. While, ink penetration, paper formation, ash content and smoothness of paper are in inverse proportioned.

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A Study on the Printability of Printing Paper according to the Changing of Calendering Condition (Calendering 조건 변화에 따른 인쇄용지의 인쇄적성에 관한 연구)

  • Kwon, Young-Jong;Youn, Jong-Tae;Ha, Young-Baeck
    • Journal of the Korean Graphic Arts Communication Society
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    • v.23 no.2
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    • pp.25-43
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    • 2005
  • Generally, machine calendering are used change of paper surface properties. During machine calendering, dry paper passes between the rolls under pressure, thereby improving the surface smoothness and gloss. These improvements make the paper better suited for printing and decreasing problems during the printing, such as delayed dry and set-off. Then we investigated newspaper properties by the changing of machine calendering condition, and relationship printability. Properties of each samples were examined in accordance with KS and TAPPI standard test method i.e, basic weight, bulk density, thickness, porosity, opacity, brightness, smoothness and roughness. IGT printability tester was used to obtain ink requirement of newspaper, printed density and set-off. Results of in this study, we have proposed the optimizes range of newspaper calendering condition. Useful optimize calendering condition was pressure 55 kN/m, temperature $130^{\circ}C$.

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The Computer Simulation of Ink Penetration in the Gravure (그라비어에서 잉크 침투의 컴퓨터 시뮬레이션)

  • Youn, Jong-Tae
    • Journal of the Korean Graphic Arts Communication Society
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    • v.28 no.2
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    • pp.45-56
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    • 2010
  • The computer simulation is presented of gravure ink transferring behavior and penetration to the paper when an gravure roller is used to transfer a printing ink onto a substrate. The three dimensional unsteady ink motion is simulated by Polyflow package software and experimented by IGT gravure printing test machine. The simulation is performed where the flow domain is bounded above by a stress free surface and bounded below by a moving substrate. Specific predictions are made for particular pattern of cells and substrates. Cell size and ink rheological properties are found to be the principal determination of transferring behavior. Simulation is currently restricted to the flow domain beneath the receding meniscus. Both Newtonian and shear thinning inks are considered.

A Study on the Partial Discharge Pattern according to the Artificial Void Dimensions in PET Film (PET film에서 Artificial Void 의 크기에 따른 PD 패턴 분석)

  • 최필문;정병선;이종찬;박대희
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1999.05a
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    • pp.415-421
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    • 1999
  • This paper indicate that phase resolved partial discharge patterns are investigated on PET films containing artificial void of varing dimensions. In this study, we measured phase-resolved PD patterns and statistical parameter from PET specimens with IGT(insulation/airgap/insulation) structure by IEC 270 standard. Measurement system is the conventional PD detector using digital signal processing technique. The relationship of diameter and location of artificial void was discussed through the difference of $\pi$-q-n distribution and statistical analysis.

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On the Print Through of the paper prepared from red algae pulp (홍조류 종이의 인쇄 뒤비침에 관한 연구)

  • Lim, Soo-Man;Youn, Jong-Tae;Lee, Young-Sea;Seo, Yung-Bum
    • Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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    • 2008.04a
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    • pp.129-134
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    • 2008
  • Properties of newly developed paper from Red Algae Pulp (RAP) were examined. The paper samples were prepared by mixing RAP fiber with wood fibers, HwBKP and SwBKP, to form a paper with $60g/m^2$ in weight. It was prepared in three to four different levels of refining degree and pressure so that it can reveal different bulk level in order to clearly compare the opacity at equivalent bulk for each furnish compositions. Printability of RAP fiber revealed superior effect on print through repression and initial ink absorption. Those properties are expected to improve further if printability improvement effect due to smoothness improvement is added.

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