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Effect of upstream meniscus shape on dynamic wetting and operating limits of Newtonian coating liquids in slot coating bead flows

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Abstract

The coating bead flow and operability window for Newtonian coating liquids are theoretically and experimentally investigated in the slot coating process, with a focus on the shape of the upstream meniscus and contact angles. From the flow visualization in the coating bead region, the contact angles of the upstream meniscus were measured by changing the flow rate and web speed under uniform operating conditions. It was confirmed that the dynamic contact angle is closely related to the capillary number in this process, based on the Hoffman–Voinov–Tanner model. The viscocapillary and two-dimensional Navier–Stokes models using the experimentally observed contact angles accurately predicted the coating bead dynamics and operability windows for two Newtonian liquids.

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Acknowledgments

This work was supported by the National Research Foundation of Korean (NRF) grant funded by the Korean government (MSIP) (NRF-2016R1A5A1009592) and the Ministry of Trade, Industry & Energy (MOTIE, Korea) under the Industrial Technology Innovation Program (No.10067706).

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Author notes

  1. Won-Gi Ahn and Si Hyung Lee have contributed equally to this study.

Authors and Affiliations

  1. Department of Chemical and Biological Engineering, Korea University, Seoul, 02841, Republic of Korea

    Won-Gi Ahn, Kwan-Young Lee & Hyun Wook Jung

  2. Samsung Advanced Institute of Technology (SAIT), Gyeonggi, 16678, Republic of Korea

    Si Hyung Lee

  3. School of Chemical and Biological Engineering, Seoul National University, Seoul, 08826, Republic of Korea

    Jaewook Nam

  4. School of Mechanical Engineering, Andong National University, Andong, 36729, Republic of Korea

    See Jo Kim

Authors
  1. Won-Gi Ahn
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  2. Si Hyung Lee
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  5. Kwan-Young Lee
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  6. Hyun Wook Jung
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Correspondence to Hyun Wook Jung.

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Ahn, WG., Lee, S.H., Nam, J. et al. Effect of upstream meniscus shape on dynamic wetting and operating limits of Newtonian coating liquids in slot coating bead flows. J Coat Technol Res 15, 1067–1076 (2018). https://doi.org/10.1007/s11998-018-0059-2

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  • DOI: https://doi.org/10.1007/s11998-018-0059-2

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