Skip to main content
Log in

Computations of coating windows for reverse roll coating of liquid films

Journal of Coatings Technology and Research Aims and scope Submit manuscript

Abstract

This paper focuses on the flow stability of reverse roll coating flows employed in practical applications to coat thin liquid films on substrates of different materials. Other coating methods are available and various computer programs are purported to predict (for each corresponding method) the set of parameters that permit stable coating conditions. The application of these programs yields so-called coating windows for each particular coating setup. Knowing these coating windows permits coating methods to be applied with preknowledge of the sets of parameters for stable coatings. For reverse roll coating, computer codes for predicting coating windows are scarce or even nonexistent, which was the reason for the present work on the analytical considerations described in this paper. The results obtained formed the basis for a reverse roll coating computer program and its applications. The program is described, and computational results are provided. These are compared with experimental data available in the literature. Good agreement was obtained for high capillary number flows, but there were discrepancies between experimental and computational results for lower capillary numbers. The experimental results for low capillary number flows also appeared less reliable, which triggered the present experimental work. Some experimental results are given for low capillary numbers and these results are also compared with corresponding numerical data. It is suggested that a test section should be built consisting of two rollers and one slot die to study experimentally the stability regions of reverse roll coating flows in a rigorous manner.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8
Fig. 9
Fig. 10
Fig. 11
Fig. 12
Fig. 13
Fig. 14
Fig. 15
Fig. 16

References

  1. Coyle, DJ, Knife and Roll Coating in Liquid Film Coating. Chapman & Hall, London (1997)

    Google Scholar 

  2. Gaskell, PH, Innes, GE, Savage, MD, “An Experimental Investigation of Meniscus Roll Coating.” J. Fluid Mech., 355 17–44 (1998)

    Article  Google Scholar 

  3. Chandio, MS, Webster, MF, “Numerical Simulation for Reverse Roller-Coating with Free Surfaces.” ECCOMAS Computational Fluid Dynamics Conference, Swansea, Wales, UK, 4–7 September 2001

  4. Benkreira, H, Shibata, Y, Ito, K, “Reverse Roll Coating with a Deformable Roll Operating at Negative Gaps.” Chem. Eng. Sci., 165 204–215 (2017)

    Article  CAS  Google Scholar 

  5. Hao, Y, Haber, S, “Reverse Roll Coating Flow.” Int. J. Numer. Methods Fluids, 30 635–652 (1999)

    Article  Google Scholar 

  6. Daniels, N, Instabilities in Roll and Slot Coating Flows, Dissertation (1998)

  7. Coyle, DJ, Macosko, CW, Scriven, LE, “The Fluid Dynamics of Reverse Roll Coating.” AIChE J., 36 (2) 161–174 (1990)

    Article  CAS  Google Scholar 

  8. Booth, GL, Coating Equipment and Processes. Lockwood Publishing Company, New York (1970)

    Google Scholar 

  9. Booth, GL, “Coating Converting Process: Traditional Methods and New Uses.” 21st Annual IGC Coating Systems Conference, Boston (1990)

  10. Satas, D, Web Processing and Converting Technology and Equipment. Van Nostrand Reinhold, New York (1984)

    Google Scholar 

  11. Taylor, GI, “Cavitation of a Viscous Fluid in Narrow Passages.” J. Fluid Mech., 16 595–619 (1963)

    Article  Google Scholar 

Download references

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to F. Durst.

Additional information

Publisher's Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Zheng, G., Wachter, F., Al-Zoubi, A. et al. Computations of coating windows for reverse roll coating of liquid films. J Coat Technol Res 17, 897–910 (2020). https://doi.org/10.1007/s11998-020-00328-1

Download citation

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s11998-020-00328-1

Keywords

Navigation