Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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An Optimal Die Design for the Coating Uniformity of Non-Newtonian Liquids in Slot Coating Process

Slot 코팅 공정에서 Non-Newtonian 유체의 코팅 균일성을 위한 최적 다이 설계

  • Lee, Si-Hyung (Department of Chemical and Biological Engineering, Korea University) ;
  • Koh, Hyun-Jung (Department of Chemical and Biological Engineering, Korea University) ;
  • Shim, Seo-Hoon (Cheil Industries R&D Center) ;
  • Jung, Hyun-Wook (Department of Chemical and Biological Engineering, Korea University) ;
  • Hyun, Jae-Chun (Department of Chemical and Biological Engineering, Korea University)
  • 이시형 (고려대학교 화공생명공학과) ;
  • 고현정 (고려대학교 화공생명공학과) ;
  • 심서훈 (제일모직 R&D 연구소) ;
  • 정현욱 (고려대학교 화공생명공학과) ;
  • 현재천 (고려대학교 화공생명공학과)
  • Published : 2011.06.30
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Abstract

In this study, the flow behavior of Newtonian and non-Newtonian coating liquids inside slot die has been scrutinized for the purpose of optimal internal die design in slot coating system from three-dimensional computations by CFD Fluent solver. A hybrid slot die could be optimally designed by changing the chamber or manifold structure to guarantee the uniform velocity distribution of coating liquids at die exit. Especially, for the non-Newtonian coating liquids, the length of coat-hanger for the uniform coating has been properly chosen, according to the degree of their shearthinning properties.

본 연구에서는 전산유체모사기인 Fluent를 활용하여 slot 다이 내부에서 Newtonian과 non-Newtonian 코팅액의 동적 거동을 고찰함으로써 최적 다이 설계를 위한 방법론을 구축하고자 하였다. 다이 출구에서 코팅액의 속도분포를 일정하게 하기 위해 chamber 구조를 변화시킴으로써 최적 하이브리드 다이의 설계가 가능하였다. 특히, non-Newtonian 유체의 경우, 전단담화 정도와 chamber의 coat-hanger 최적 길이의 상관관계를 도출하였다.

Keywords

References

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