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Three Minimum Wet Thickness Regions of Slot die Coating by Yu-Rong Chang; Hsien-Ming Chang; Chi-Feng Lin; Ta-Jo Liu; Ping-Yao Wu is a Chemistry article available to read on EtoBox.
What is Three Minimum Wet Thickness Regions of Slot die Coating about?
An experimental study was carried out to determine the minimum wet thickness of slot die coating for low-viscosity solutions. There exist three distinct coating regions (I, II, and III), depending on the physical properties of the coating fluid, die geometry, and flow conditions. A critical Reynolds number was found, below which viscous and surface tension effects are important. In Region I, the minimum wet thickness increases with increasing capillary number and becomes independent of capillary number in Region II. Region III exists above the critical Reynolds number where fluid inertia is dominant. In this region, the minimum wet thickness decreases as Reynolds number increases. Flow visualization on the coating bead reveals that the position of the downstream meniscus of the coating bead determines the types of coating region, whereas the shape and position of the upstream meniscus determine the type of coating defects. It was also observed that the downstream meniscus was not located at the die lip corner and both the static and dynamic contact angles varied under different conditions. These findings are critical for realistic theoretical study of slot die coating.
Who reads Three Minimum Wet Thickness Regions of Slot die Coating?
It is typically read by researchers, students, and practitioners in Chemistry.
- Author
- Yu-Rong Chang; Hsien-Ming Chang; Chi-Feng Lin; Ta-Jo Liu; Ping-Yao Wu
- Publisher
- Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 0021-9797)
- Published
- 2007
- Language
- EN
- Field
- Chemistry (Physical Sciences)