Surface tension driven leveling of spray droplets

D Bousfield, Martti Toivakka

    Research output: Chapter in Book/Conference proceedingConference contributionScientificpeer-review

    6 Citations (Scopus)

    Abstract

    Spray coating has the potential to be a major non-contact coating method. However, to obtain good coverage and uniformity of the coating layer on paper, sufficient leveling of droplets must take place. Though there has been some work on the leveling of scratches in coating layers due to blades, little has been done to understand the leveling of droplets on paper. A model of surface tension driven leveling is developed that can start with the shape after the droplet impact event, and follow the leveling of the fluid layer as a function of time. The model accounts for surface tension of fluid, viscosity, and base paper absorption characteristics, such as void fraction, pore size and contact angle. The competing processes of leveling and absorption det. the final surface uniformity. The key parameters during leveling are droplet size and fluid viscosity. Other parameters such as coating solids content and filter cake flow resistance can also result in incomplete leveling and lead to poor quality coating layers. The basic predictions of the model are supported by the general trends reported on spray coating. [on SciFinder(R)]
    Original languageUndefined/Unknown
    Title of host publication2003 Advanced Coating Fundamentals Symposium Proceedings
    PublisherTAPPI Press
    Pages
    Publication statusPublished - 2003
    MoE publication typeA4 Article in a conference publication
    Eventconference -
    Duration: 1 Jan 2010 → …

    Conference

    Conferenceconference
    Period01/01/10 → …

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