Operability coating windows and frequency response in slot coating flows from a viscocapillary model

被引：46

作者：

Lee, Si Hyung ^{[1
]}

Koh, Hyun Jung ^{[1
]}

Ryu, Bo Kyung ^{[2
]}

Kim, See Jo ^{[3
]}

Jung, Hyun Wook ^{[1
]}

Hyun, Jae Chun ^{[1
]}

机构：

[1] Korea Univ, Dept Chem & Biol Engn, Seoul 136713, South Korea

[2] LG Chem Res Pk, Taejon 305380, South Korea

[3] Andong Natl Univ, Sch Mech Engn, Andong 760749, South Korea

来源：

CHEMICAL ENGINEERING SCIENCE | 2011年 / 66卷 / 21期

关键词：

Transport processes; Films; Mathematical modeling; Laminar flow; Slot coating; Frequency response; PRESSURE; SHAPE;

D O I：

10.1016/j.ces.2011.04.044

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Slot coating, indispensable to the manufacturer of flat panel displays and long-life secondary batteries, can be susceptible to unexpected disturbances at high speeds, leading to many kinds of undesirable defects. Operability coating windows for both Newtonian and non-Newtonian (shear-thinning) liquids have been investigated using a simplified viscocapillary model in a slot coating bead flow regime. Stable coating windows, free from leaking (or dripping) and bead break-up, have been determined by the position of upstream meniscus. They quantitatively coincided with those from two-dimensional calculations by a CFD Fluent solver. The pressure range that allowed a stable bead widened as the viscosity of the coating liquid or the capillary number in downstream die region increased. Also, the sensitivity of the slot coating flow through frequency response method was tested by measuring the amplitude of final wet coating thickness with respect to ongoing sinusoidal disturbances at different frequencies imposed to web speed, flow rate, bead pressure and coating gap. The viscocapillary model was compared with a 2D model and was found to be a fast and efficient tool that could enhance the productivity and processability of coating systems. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：4653 / 4659

页数：7

共 24 条

[1]

[Anonymous], 1977, FUNDAMENTALS POLYM P

[2]

CARVALHO M, 1996, THESIS U MINNESOTA

[3] Start-Up of Slot Die Coating [J].

Chang, Yi-Rong ;

Lin, Chi-Feng ;

Liu, Ta-Jo .

POLYMER ENGINEERING AND SCIENCE, 2009, 49 (06) :1158-1167

[4] The effect of inorganic particles on slot die coating of poly(vinyl alcohol) solutions [J].

Chu, WB ;

Yang, JW ;

Wang, YC ;

Liu, TJ ;

Tiu, C ;

Guo, J .

JOURNAL OF COLLOID AND INTERFACE SCIENCE, 2006, 297 (01) :215-225

[5]

DESANTOS J, 1991, THESIS U MINNESOTA

[6] THE EFFECT OF APPLIED PRESSURE ON THE SHAPE OF A 2-DIMENSIONAL LIQUID CURTAIN FALLING UNDER THE INFLUENCE OF GRAVITY [J].

FINNICUM, DS ;

WEINSTEIN, SJ ;

RUSCHAK, KJ .

JOURNAL OF FLUID MECHANICS, 1993, 255 :647-665

[7]

GATES IA, 1999, THESIS U MINNESOTA

[8]

Gutoff EB., 1995, COATING DRYING DEFEC

[9] CAPILLARY-PRESSURE AND VISCOUS PRESSURE-DROP SET BOUNDS ON COATING BEAD OPERABILITY [J].

HIGGINS, BG ;

SCRIVEN, LE .

CHEMICAL ENGINEERING SCIENCE, 1980, 35 (03) :673-682

[10] INTERFACIAL SHAPE AND EVOLUTION EQUATIONS FOR LIQUID-FILMS AND OTHER VISCOCAPILLARY FLOWS [J].

HIGGINS, BG ;

SCRIVEN, LE .

INDUSTRIAL & ENGINEERING CHEMISTRY FUNDAMENTALS, 1979, 18 (03) :208-215

← 1 2 3 →