Abstract
Roll-to-roll slot-die manufacturing of soluble materials with a uniform layer is a critical step in realizing low-cost and eco-friendly printed electronics for solar cells and batteries. This study presents an analysis of the lateral thickness of a coated layer that consists of a fluid with a high viscosity produced by using a slot-die roll-to-roll system with specific attention focused on a pinned edge phenomenon exhibited in the coated layer. A solution viscosity of 832 mPa·s is used and includes relatively high capillary numbers in the experiment in the range of 0.47–3.47. The purpose of the study included analyzing various forces around the coating nozzle and determining the correlation between forces by using dimensionless numbers. Computational fluid dynamics analysis and experiments were performed to obtain various parameters in terms of these dimensionless numbers. The experimental results suggest that the pinned edge should be reduced below 10% by reducing the coating gap parameter that represents the gravity forces.
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Abbreviations
- t :
-
Time
- ρ :
-
Density
- p :
-
Pressure
- μ :
-
Viscosity
- v :
-
Fluid flow velocity vector field
- g :
-
Gravity vector field
- m :
-
Mass
- A :
-
Area of the inlet vector field
- v in :
-
Velocity inputs
- v out :
-
Velocity outputs
- v i :
-
ithSampled output velocity
- M :
-
Mean value of the data set
- Σ :
-
Standard deviation of the data set
- x i :
-
ith thickness of the coated layer
- U :
-
Percentage of uniformity variation
- F i :
-
Inertia forces
- F g :
-
Surface tension forces
- F σ :
-
Gravity forces
- F μ :
-
Viscous forces
- Ca :
-
Capillary number
- Re :
-
Reynolds number
- St :
-
Stokes number
- Fr :
-
Froude number
- V :
-
Coating velocity
- H :
-
Coating gap
- σ :
-
Surface tension of the liquid
- g :
-
Acceleration of gravity
References
Park, J., Shin, K., and Lee, C., “Roll-to-Roll Coating Technology and its Applications: A Review,” Int. J. Precis. Eng. Manuf., Vol. 17, No. 4, pp. 537–550, 2016.
Li, T. -C. and Chang, R. -C., “Improving the Performance of ITO Thin Films by Coating PEDOT: PSS,” Int. J. Precis. Eng. Manuf.-Green Tech., Vol. 1, No. 4, pp. 329–334, 2014.
Roh, H. D., Lee, H., and Park, Y. -B., “Structural Health Monitoring of Carbon-Material-Reinforced Polymers Using Electrical Resistance Measurement,” Int. J. Precis. Eng. Manuf.-Green Tech., Vol. 3, No. 3, pp. 311–321, 2016.
Lee, H., Jeong, J., Park, Y. -i., and Cha, S. W., “Energy Management Strategy of Hybrid Electric Vehicle Using Battery State of Charge Trajectory Information,” Int. J. Precis. Eng. Manuf.-Green Tech., Vol. 4, No. 1, pp. 79–86, 2017.
Yim, C., Greco, K., Sandwell, A., and Park, S. S., “Eco-Friendly and Rapid Fabrication Method for Producing Polyethylene Terephthalate (PET) Mask Using Intensive Pulsed Light,” Int. J. Precis. Eng. Manuf.-Green Tech., Vol. 4, No. 2, pp. 155–159, 2017.
Ding, X., Liu, J., and Harris, T. A., “A Review of the Operating Limits in Slot Die Coating Processes,” AIChE Journal, Vol. 62, No. 7, pp. 2508–2524, 2016.
Higgins, B. and Scriven, L., “Capillary Pressure and Viscous Pressure Drop Set Bounds on Coating Bead Operability,” Chemical Engineering Science, Vol. 35, No. 3, pp. 673–682, 1980.
Bassa, A. “Vacuum Box with Variable Stage Volume to Improve Coating Uniformity,” US Patent, 4545321, 1985.
Cheema, T. A., Kim, K. W., Kwak, M. K., Lee, C. Y., Kim, G. M., et al., “Numerical Investigation on Composite Porous Layers in Electroosmotic Flow,” Int. J. Precis. Eng. Manuf.-Green Tech. Vol. 1, No. 3, pp. 207–213, 2014.
Chang, H. M., Chang, Y. R., Lin, C. F., and Liu, T. J., “Comparison of Vertical and Horizontal Slot Die Coatings,” Polymer Engineering and Science, Vol. 47, No. 11, pp. 1927–1936, 2007.
Carvalho, M. S. and Kheshgi, H. S., “Low-Flow Limit in Slot Coating: Theory and Experiments,” AIChE Journal, Vol. 46, No. 10, pp. 1907–1917, 2000.
Ji, H. S., Ahn, W.-G., Kwon, I., Nam, J., and Jung, H. W., “Operability Coating Window of Dual-Layer Slot Coating Process Using Viscocapillary Model,” Chemical Engineering Science, Vol. 143, pp. 122–129, 2016.
Akbarzadeh, V. and Hrymak, A., “Coupled Fluid-Particle Modeling of a Slot Die Coating System,” AIChE Journal, Vol. 62, No. 6, pp. 1933–1939, 2016.
Chang, Y. -R., Chang, H. -M., Lin, C. -F., Liu, T. -J., and Wu, P. -Y., “Three Minimum Wet Thickness Regions of Slot Die Coating,” Journal of Colloid and Interface Science, Vol. 308, No. 1, pp. 222–230, 2007.
Lee, J. -W. and Yoo, Y. -T., “A Comparative Study On Dimensional Stability of PET and BOPP Substrates for Fabrication of Flexible Electric/Electronic Devices Through Roll-to-Roll Printing,” Journal of Industrial and Engineering Chemistry, Vol. 18, No. 5, pp. 1647–1653, 2012.
Park, J., Shin, K., and Lee, C., “Optimized Design for Anti-Reflection Coating Process in Roll-to-Roll Slot-Die Coating System,” Robotics and Computer-Integrated Manufacturing, Vol. 30, No. 5, pp. 432–441, 2014.
Park, J., Shin, K., and Lee, C., “Improvement of Cross-Machine Directional Thickness Deviation for Uniform Pressure-Sensitive Adhesive Layer in Roll-to-Roll Slot-Die Coating Process,” Int. J. Precis. Eng. Manuf., Vol. 16, No. 5, pp. 937–943, 2015.
Kang, H., Park, J., and Shin, K., “Statistical Analysis for The Manufacturing of Multi-Strip Patterns by Roll-to-Roll Single Slot-Die Systems,” Robotics and Computer-Integrated Manufacturing, Vol. 30, No. 4, pp. 363–368, 2014.
Kang, H. and Lee, C., “Effect of Tension on Conductivity of Gravure Printed Ag Layer in Roll-to-Roll Process,” Int. J. Precis. Eng. Manuf., Vol. 16, No. 1, pp. 99–104, 2015.
Shin, K., Park, J., and Lee, C., “A 250-Mm-Width, Flexible, and Continuous Roll-to-Roll Slot-Die Coated Carbon Nanotube/Silver Nanowire Film Fabrication and a Study on the Effect of Anti-Reflective Overcoat,” Thin Solid Films, Vol. 598, pp. 95–102, 2016.
Lee, J. and Lee, C., “An Advanced Model for the Numerical Analysis of the Radial Stress in Center-Wound Rolls,” International Journal of Mechanical Sciences, Vol. 105, pp. 360–368, 2016.
Etxebarria, I., Tait, J., Gehlhaar, R., Pacios, R., and Cheyns, D., “Surface Treatment Patterning of Organic Photovoltaic Films for Low-Cost Modules,” Organic Electronics, Vol. 14, No. 1, pp. 430–435, 2013.
Krebs, F. C., “Polymer Solar Cell Modules Prepared Using Roll-to-Roll Methods: Knife-Over-Edge Coating, Slot-Die Coating and Screen Printing,” Solar Energy Materials and Solar Cells, Vol. 93, No. 4, pp. 465–475, 2009.
Lin, C. F., Wong, H. D. S., Liu, T. J., and Wu, P. Y., “Operating Windows of Slot Die Coating: Comparison of Theoretical Predictions with Experimental Observations,” Advances in Polymer Technology, Vol. 29, No. 1, pp. 31–44, 2010.
Bhamidipati, K., Didari, S., and Harris, T. A., “Experimental Study on Air Entrainment in Slot Die Coating of High-Viscosity, Shear-Thinning Fluids,” Chemical Engineering Science, Vol. 80, pp. 195–204, 2012.
Bhamidipati, K. L., Didari, S., Bedell, P., and Harris, T. A., “Wetting Phenomena During Processing of High-Viscosity Shear-Thinning Fluid,” Journal of Non-Newtonian Fluid Mechanics, Vol. 166, No. 12, pp. 723–733, 2011.
Park, G. H,, Kim, K. T., Ahn, Y. T., Lee, H. -I., and Jeong, H. M., “The Effects of Graphene on the Properties of Acrylic Pressure-Sensitive Adhesive,” Journal of Industrial and Engineering Chemistry, Vol. 20, No. 6, pp. 4108–4111, 2014.
Fu, H., Yan, C., Zhou, W,. and Huang, H., “Nano-SiO2/fluorinated Waterborne Polyurethane Nanocomposite Adhesive for Laminated Films,” Journal of Industrial and Engineering Chemistry, Vol. 20, No. 4, pp. 1623–1632, 2014.
Pedlosky, J., “Geophysical Fluid Dynamics,” Springer Science and Business Media, 2013.
Batchelor, G. K., “An Introduction to Fluid Dynamics,” Cambridge University Press, 1970.
Harris, T. A., Walczyk, D. F., and Weber, M. M., “Manufacturing of High-Temperature Polymer Electrolyte Membranes—Part I: System Design and Modeling,” Journal of Fuel Cell Science and Technology, Vol. 7, No. 1, 011007, 2010.
Lee, J., Shin, K., and Lee, C., “Analysis of Dynamic Thermal Characteristic of Register of Roll-to-Roll Multi-Layer Printing Systems,” Robotics and Computer-Integrated Manufacturing, Vol. 35, pp. 77–83, 2015.
Cui, L., Zhang, J., Zhang, X., Huang, L., Wang, Z., et al., “Suppression of the Coffee Ring Effect by Hydrosoluble Polymer Additives,” ACS Applied Materials & interfaces, Vol. 4, No. 5, pp. 2775–2780, 2012.
Romero, O., Scriven, L., and Carvalho, M., “Slot Coating of Mildly Viscoelastic Liquids,” Journal of Non-Newtonian Fluid Mechanics, Vol. 138, No. 2, pp. 63–75, 2006.
Lee, K. Y., Liu, L. D., and Ta-Jo, L., “Minimum Wet Thickness in Extrusion Slot Coating,” Chemical Engineering Science, Vol. 47, No. 7, pp. 1703–1713, 1992.
Ruschak, K. J., “Limiting Flow in A Pre-Metered Coating Device,” Chemical Engineering Science, Vol. 31, No. 11, pp. 1057–1060, 1976.
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Park, J., Kim, S. & Lee, C. An Analysis of Pinned Edge Layer of Slot-Die Coated Film in Roll-to-Roll Green Manufacturing System. Int. J. of Precis. Eng. and Manuf.-Green Tech. 5, 247–254 (2018). https://doi.org/10.1007/s40684-018-0025-6
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DOI: https://doi.org/10.1007/s40684-018-0025-6