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

Si Hyung Lee; Hyun Jung Koh; Bo Kyung Ryu; See Jo Kim; Hyun Wook Jung; Jae Chun Hyun

doi:10.1016/j.ces.2011.04.044

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

Si Hyung Lee, Hyun Jung Koh, Bo Kyung Ryu, See Jo Kim, Hyun Wook Jung^*, Jae Chun Hyun

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

45 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	4953-4959
Number of pages	7
Journal	Chemical Engineering Science
Volume	66
Issue number	21
DOIs	https://doi.org/10.1016/j.ces.2011.04.044
Publication status	Published - 2011 Nov 1

Bibliographical note

Funding Information:
This study was supported by research grants from Mid-career Researcher Program through NRF grant by the MEST ( R01-2008-000–11701-0 ), Korea Institute of Energy Technology Evaluation and Planning (KETEP), and Seoul R&BD Program ( 10575 ).

Copyright:
Copyright 2011 Elsevier B.V., All rights reserved.

Keywords

Films
Frequency response
Laminar flow
Mathematical modeling
Slot coating
Transport processes

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering
Industrial and Manufacturing Engineering

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10.1016/j.ces.2011.04.044

Cite this

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title = "Operability coating windows and frequency response in slot coating flows from a viscocapillary model",

abstract = "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.",

keywords = "Films, Frequency response, Laminar flow, Mathematical modeling, Slot coating, Transport processes",

author = "Lee, \{Si Hyung\} and Koh, \{Hyun Jung\} and Ryu, \{Bo Kyung\} and Kim, \{See Jo\} and Jung, \{Hyun Wook\} and Hyun, \{Jae Chun\}",

note = "Funding Information: This study was supported by research grants from Mid-career Researcher Program through NRF grant by the MEST ( R01-2008-000–11701-0 ), Korea Institute of Energy Technology Evaluation and Planning (KETEP), and Seoul R\&BD Program ( 10575 ). Copyright: Copyright 2011 Elsevier B.V., All rights reserved.",

year = "2011",

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doi = "10.1016/j.ces.2011.04.044",

language = "English",

volume = "66",

pages = "4953--4959",

journal = "Chemical Engineering Science",

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AU - Lee, Si Hyung

AU - Koh, Hyun Jung

AU - Ryu, Bo Kyung

AU - Kim, See Jo

AU - Jung, Hyun Wook

AU - Hyun, Jae Chun

N1 - Funding Information: This study was supported by research grants from Mid-career Researcher Program through NRF grant by the MEST ( R01-2008-000–11701-0 ), Korea Institute of Energy Technology Evaluation and Planning (KETEP), and Seoul R&BD Program ( 10575 ). Copyright: Copyright 2011 Elsevier B.V., All rights reserved.

PY - 2011/11/1

Y1 - 2011/11/1

N2 - 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.

AB - 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.

KW - Films

KW - Frequency response

KW - Laminar flow

KW - Mathematical modeling

KW - Slot coating

KW - Transport processes

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DO - 10.1016/j.ces.2011.04.044

M3 - Article

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SN - 0009-2509

VL - 66

SP - 4953

EP - 4959

JO - Chemical Engineering Science

JF - Chemical Engineering Science

IS - 21

ER -

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

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Bibliographical note

Keywords

ASJC Scopus subject areas

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