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Effect of sloped die lip geometry on the operability window in slot coating flows using viscocapillary and two-dimensional models

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Abstract

As an indicator for determining the operability window in slot coating flow, the viscocapillary model considering various configurations of upstream and downstream slot die lips was tested and compared with Navier–Stokes two-dimensional model. Bead pressure and sloped lip angle conditions for uniform coating operation demarcated from leaking and bead break-up defects were quantitatively predicted from the position of upstream meniscus from both models. By comparing the results, it is confirmed that the viscocapillary model for many kinds of sloped die lips could predict the operability window accurately. It is also found that there exists vortex or recirculation regimes inside upstream and downstream coating bead regions, depending on the angles of sloped die lips, even for the stable coating flow. The flow control by die lip structure will be usefully applied to design the strategy for the reliable and optimal coating process, including vortex-free windows.

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Acknowledgments

This study was supported by research grants from the Industrial Strategic Technology Development Program (10035163) and the Human Resources Development of Korea Institute of Energy Technology Evaluation and Planning (KETEP: No. 20114010203050).

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Authors and Affiliations

  1. Department of Chemical and Biological Engineering, Korea University, Seoul, 136-713, South Korea

    Si Hyung Lee, Hyun Wook Jung & Jae Chun Hyun

  2. School of Mechanical Engineering, Andong National University, Andong, 760-749, South Korea

    See Jo Kim

  3. School of Chemical Engineering, Sungkyunkwan University, Suwon, 440-746, South Korea

    Jaewook Nam

Authors
  1. Si Hyung Lee
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  2. See Jo Kim
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  3. Jaewook Nam
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  4. Hyun Wook Jung
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  5. Jae Chun Hyun
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Corresponding authors

Correspondence to Jaewook Nam or Hyun Wook Jung.

Additional information

This paper was presented at the 16th International Coating Science and Technology Symposium, September 9-12, in Atlanta, GA (USA).

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Lee, S.H., Kim, S.J., Nam, J. et al. Effect of sloped die lip geometry on the operability window in slot coating flows using viscocapillary and two-dimensional models. J Coat Technol Res 11, 47–55 (2014). https://doi.org/10.1007/s11998-013-9504-4

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  • DOI: https://doi.org/10.1007/s11998-013-9504-4

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