• Title/Summary/Keyword: IGT printability tester

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A Study of the Printability Coefficients on the Newspaper (I) - A Study on the printed density and print through in the maximum transfer point - (신문용지의 인쇄적성 예수에 관한 연구 (제1보) - 최대전이점에서 인쇄 색농도 및 뒤비침 -)

  • Ha Young-Baeck;Kim Chang-Keun;Oh Sung-Sang;Youn Jong-Tae
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.38 no.1 s.113
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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.

신문용지의 인쇄적성 계수에 관한 연구 I -최대 전이점에서 인쇄 색농도, 뒤비침-

  • Ha, Yeong-Baek;Kim, Chang-Geun;O, Seong-Sang;Yun, Jong-Tae
    • Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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    • 2005.11a
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    • pp.187-196
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    • 2005
  • 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($Y_{max}$), print through were investigated. Kinds of Korean newspapers and three kinds of news printing inks 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 1m/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.

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Image Processing of the Photo CD Image to use in the Lithographic Offset Printing (평판 오프셋 인쇄에 이용하기위한 Photo CD 이미지의 화상처리)

  • 안석출
    • Journal of the Korean Graphic Arts Communication Society
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    • v.14 no.1
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    • pp.31-45
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    • 1996
  • For the purpose of study on the printability of domestic art papers, the physical properties of domestic coated paper for offset printing were investigated. 25 kinds of sample papers were prepared and were examined in accordance with KS and TAPPI standard testing method i.e., basis weight, density, opacity, gloss, roughness, smoothness, brightness, and K&N absorption. IGT printability tester was used to obtain the printability parameters, such as maximum ink requirement of paper Y, limiting printing density D print through, and density smoothness constant m value.

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Study on the polymerization-induced phase separation of UV-curable material (UV경화제료의 중합상분리에 관한 연구)

  • 최정병
    • Journal of the Korean Graphic Arts Communication Society
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    • v.15 no.2
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    • pp.131-143
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    • 1997
  • Surface sizing is one of the important process to the paper making. Surface sizing had an effect on penetration of oils, physical propertiesm water resistance for the paper. This study was carried out for the purpose of improving printability with surface sizing of domestic newspaper. The samples were prepared by means of TAPPI method(TAPPI 205 om~88), and were wested by IGT printability tester. The results of this study showed that the set-off was reduced on the surface sized with oxidized starch.

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The Effects of Ink Dispersion and Printing Conditions on Printed Mottle (잉크 분산 및 인쇄조건이 인쇄 모틀에 미치는 영향)

  • Ha, Young-Baeck;Lee, Yong-Kyu;Kim, Chang-Keun;Oh, Sung-Sang;Lim, Jong-Hag
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.38 no.4 s.117
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    • pp.41-46
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    • 2006
  • Printed mottle of coated paper is one of the most common but the most difficult problem in offset printing. Printed mottle is caused by an uneven penetration of Ink into the paper, binder migration, etc. For a high quality printing, development of new paper coating technologies to prevent print mottle is required. So for, the study of solving printed mottle is coated paper absorption controlled by base paper sizing and coating layer binder migration control. As a results, printed mottle has improved in coated paper. But printing is worked by interaction of printing ink, coated paper and printing pressure, then we need to understand of interaction printing work and coated paper. This research focused on a way of improving printed mottle by investigating various printing conditions such as ink dispersion, nip condition and amount of ink transfer using IGT printability tester.

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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The Study of the Printability on the Phenol Free Heat-Set Web Inks(III) - Effects of the Emulsification of Ink on Print Quality - (Phenol Free Heat-Set 윤전 잉크의 인쇄적성에 관한 연구 (제3보) - 잉크 유화가 인쇄품질에 미치는 영향 -)

  • Ha, Young-Baeck;Oh, Sung-Sang;Lee, Won-Jae
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.44 no.4
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    • pp.77-84
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    • 2012
  • The lithographic process depends on a satisfactory ink-in-water emulsion being formed during printing and the speed of wet presses makes the choice of fountain solution vitally important as the ink and fount must react quickly to form a stable emulsion. Ink and water come into contact with each other on the rolls of the press and are forced together in the roll nips. The water is not soluble in the ink since it is slightly fat. Instead, an emulsion is formed, a heterogeneous mass consisting of small water drops mixed into the ink, if the water feed is too great. This emulsification can affect the properties of an off-set ink and negatively affect the printability. So we investigated the effects of the emulsification of phenol free heat-set ink and existing heat-set ink on printed quality, such as amount of ink transfer, printed density, print-through and uniformity. We used Duke emulsification tester for the emulsification of inks, and used IGT printability tester for printed quality. The printed quality were measured by densitometer and were evaluated by the image analysis system. Compared to conventional printing ink, phenol-free ink showed better results of the printability at the emulsification.

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 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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