Journal of Korea Technical Association of The Pulp and Paper Industry (펄프종이기술)

Korea Technical Association of the Pulp and Paper Industry (한국펄프종이공학회)
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Computer Simulation for the Cavitation Changes at the Exit of Offset Printing Nip

오프셋 인쇄의 틈새출구에서 공동의 변화에 대한 시뮬레이션

  • Youn, Jong-Tae (Dept. of Graphic Arts Information Engineering, College of Engineering, Pukyong National University) ;
  • Kim, Yun-Taek (Dept. of Graphic Arts Information Engineering, College of Engineering, Pukyong National University) ;
  • Lim, Soo-Man (Dept. of Graphic Arts Information Engineering, College of Engineering, Pukyong National University)
  • 윤종태 (부경대학교 공과대학 인쇄정보공학과) ;
  • 김윤택 (부경대학교 공과대학 인쇄정보공학과) ;
  • 임수만 (부경대학교 공과대학 인쇄정보공학과)
  • Received : 2014.04.02
  • Accepted : 2014.05.21
  • Published : 2014.06.30
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Abstract

Offset paper printing is a promising roll-to-roll technique for color printed materials. Although it is no doubt that understanding ink transfer mechanism in offset printing process is necessary to achieve high printing quality, investing the relationship between inks and substrates at the nip is difficult experimentally due to high printing speed. In this paper, rheological behavior and splitting point of the ink at the nip is studied using package software Ployflow and Flow 3D based on Navier-Stokes equation. Polydimethylsiloxane (PDMS) ink and IGT printability tester were used for an model ink and experiment to compare with that of simulation data, respectively. As a result, higher viscosity at state flow and pressure increased ink transfer due to higher possibility of presence of cavitation at the nip and increase in covering area ratio. These results have shown good agreements with experimental data compared by measuring density of print through.

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References

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