The Effects of Ink Emulsion on Printed Mottle

잉크 유화가 인쇄 모틀에 미치는 영향

  • Ha, Young-Baeck (Dept. of Paper Science & Engineering, College of Forest Sciences, Kangwon National University) ;
  • Lee, Yong-Kyu (Dept. of Paper Science & Engineering, College of Forest Sciences, Kangwon National University) ;
  • Kim, Chang-Keun (Changgang Institute of Paper Science and Technology, Kangwon National University) ;
  • Oh, Sung-Sang (Graphic Arts Media, Shin Gu College) ;
  • Lim, Jong-Hag (Daihan Ink Co. LTD.) ;
  • Youn, Jong-Tae (Division of Image & Information, College of Engineering, Pukyong National University)
  • 하영백 (강원대학교 산림과학대학 제지공학과) ;
  • 이용규 (강원대학교 산림과학대학 제지공학과) ;
  • 김창근 (강원대학교 창강 제지 기술 연구소) ;
  • 오성상 (신구대학 그래픽아츠 미디어과) ;
  • 임종학 (대한잉크 주식회사) ;
  • 윤종태 (부경대학교 공과대학 화상정보공학부 인쇄공학과)
  • Published : 2007.06.30

Abstract

Lithography like off-set printing is processed using the repellent properties between water and oil, so all inks for off-printing must work with dampening solution(water). The dampening water may cause the emulsification of ink by the printing pressure in the printing nip. This study aimed to investigate the effect of emulsified inks on print mottle. The cyan ink was emulsified artificially with the different IPA(isopropyl alcohol) content in this study. We evaluated the print mottle by densitometer and image analysis method. The print mottle phenomenon was directly affected by IPA content. The emulsification of inks also had an influence on flow properties of inks and it increased ink transfer rate. It, however, caused low ink density. Moreover the emulsified inks were spreaded to around dots and cause the thinning density on the non-printing area like print mottle. The trial printing showed that the emulsified inks also cause scumming on the printing result with little mistake of adjusting dampening solution and mostly decreasing dot reproduction. We could, therefore, find out the obvious effect of emulsified inks on print mottle.

Keywords

References

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