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Received October 29, 2010
Accepted December 9, 2010
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Slot 코팅 공정에서 Non-Newtonian 유체의 코팅 균일성을 위한 최적 다이 설계
An Optimal Die Design for the Coating Uniformity of Non-Newtonian Liquids in Slot Coating Process
고려대학교 화공생명공학과, 136-713 서울시 성북구 안암동 5가 1제일모직 R&D 연구소, 437-711 경기도 의왕시 고천동 332-3번지
Department of Chemical and Biological Engineering, Korea University, 5-ga, Anam-dong, Seongbuk-gu, Seoul 136-713, Korea 1Cheil Industries R&D Center, 332-3, Gocheon-dong, Uiwang-si, Gyeonggi 437-711, Korea
hwjung@grtrkr.korea.ac.kr
Korean Chemical Engineering Research, June 2011, 49(3), 314-319(6), NONE Epub 8 June 2011
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Abstract
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.
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,_x000D_
the length of coat-hanger for the uniform coating has been properly chosen, according to the degree of their shearthinning properties.
Keywords
References
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Higgins BG, Scriven LE, Chem. Eng. Sci., “Capillary Pressure and Viscous Pressure Drop Set Bounds on Coating Bead Operability", 35, 673 (1980)
Sartor L, Slot Coating: Fluid Mechanics and Die Design. PhD Thesis, University of Minnesota (1990)
Gates IA, Slot Coating Flows: Feasibility, Quality. PhD Thesis, Gates, I. A., Slot Coating Flows: Feasibility, Quality. PhD Thesis (1999)
Lee KY, Liu LD, Liu TJ, Chem. Eng. Sci., “Minimum Wet Thickness in Extrusion Slot Coating", 47, 1703 (1992)
Carvalho MS, Kheshgi HS, AIChE J., “Low-flow Limit in Slot Coating: Theory and Experiments", 46(10), 1907 (2000)
Ning CY, Tsai CC, Liu TJ, Chem. Eng. Sci., “The Effect of Polymer Additives on Extrusion Slot Coating", 51(12), 3289 (1996)
Yang CK, Wong DSH, Liu TJ, Polym. Eng. Sci., “The Effects of Polymer Additives on the Operating Windows of Slot Coating", 44(10), 1970 (2004)
Romero OJ, Suszynski WJ, Scriven LE, Carvalho MS, J. Non-Newton. Fluid Mech., “Low-flow Limit in Slot Coating of Dilute Solutions of High Molecular Weight Polymer", 118(2-3), 137 (2004)
Carley JF, J. Appl. Phys., “Flow of Melts in ‘Crosshead’-slit Dies: Criteria for Die Design", 9, 1118 (1954)
Pearson JRA, Trans. J. Plastics Inst., “Non-Newtonian Flow and Die Design”, 32, 239 (1964)
McKelvey JM, Ito K, Polym. Eng. Sci., “Uniformity of Flow From Sheeting Dies", 11, 258 (1971)
Matsubara Y, Polym. Eng. Sci., “Geometry Design of a Coat-Hanger Die with Uniform Flow Rate and Residence Time Across the Die Width", 19, 169 (1979)
Lee KY, Liu LD, Polym. Eng. Sci., “Design and Analysis of a Dual-cavity Coat-hanger Die", 29, 15 (1989)
Tadmor Z, Broyer E, Gutfinger C, Polym. Eng. Sci., “Flow Analysis Network (FAN) Method for Solving Flow Problems in Polymer Processing", 14, 660 (1974)
Wang Y, Int. Polym. Proc., “Extrusion of Rubber Compounds and Highly Filled Thermoplastics through Coathanger Dies", 6, 311 (1991)
Fluent 6.2 User’s Guide, Fluent Inc.
