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    The fluid mechanics of tensioned web roll coating

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    Publication date
    2021
    End of Embargo
    2022-03-26
    Author
    Benkreira, Hadj
    Shibata, Yusuke
    Ito, K.
    Keyword
    Tensioned web roll coating
    Thin films
    Cascade
    Dynamic wetting
    Rights
    © 2021 Elsevier. Reproduced in accordance with the publisher's self-archiving policy. This manuscript version is made available under the CC-BY-NC-ND 4.0 license.
    Peer-Reviewed
    Yes
    Open Access status
    Green
    
    Metadata
    Show full item record
    Abstract
    Tensioned web-roll coating is widely used but has surprisingly received little research attention. Here, a new semi-empirical model that predicts film transfer from applicator roller to web is developed and tested against data collected from a pilot coating line. The film transfer is found to vary linearly with web to applicator speed ratio S. Flow stability investigations revealed three types of defects: rivulets, air entrainment due to dynamic wetting failure and cascade, occurring at different values of S and capillary number Ca. Rivulets occurred at Ca< 0.4 and S> 0.71-0.81, air entrainment at Ca>0.4 and S>0.71-0.83 and cascades at S>1.1 for Ca up to 6. Web speeds at which dynamic wetting failure occurred were, for the same Ca, comparatively higher than those that occur in dip coating. The data show that such hydrodynamic assistance is due to the coating bead being confined, more so with increasing web wrap angle β.
    URI
    http://hdl.handle.net/10454/18420
    Version
    Accepted manuscript
    Citation
    Benkreira H, Shibata, Y and Ito K (2021) The fluid mechanics of tensioned web roll coating. Chemical Engineering Science. Accepted for publication. 116612. Accepted for publication.
    Link to publisher’s version
    https://doi.org/10.1016/j.ces.2021.116612
    Type
    Article
    Notes
    The full-text of this article will be released for public view at the end of the publisher embargo on 26th March 2022.
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    Engineering and Informatics Publications

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