Elucidating the mechanisms of liquid and vapour transport during drying of porous coatings

Joel Songok, Douglas Bousfield, Cathy Ridgway, Patrick Gane, Martti Toivakka

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

    Abstract

    The influence of the coating composition of a porous paper coating on the evaporation rate of water contained in the sample has been studied experimentally. For low-content latex samples, drying was found to be mainly controlled by capillarity, perhaps also in the form of thin film pore surface feature/wall wetting, which drew water from the connected pores to the drying surface or near the surface. This led to a lengthy constant drying rate period (CDRP) where nearly 70 % of the saturated water was evaporated. High-content latex samples, characterized by low porosity and permeability showed shorter CDRP and lengthy falling drying rate period. The drying rate curve varied as the square root of time, indicating a diffusive controlled mechanism. Low latex content samples took less time to dry, which can be inferred to mean they require less drying energy.
    Original languageUndefined/Unknown
    Title of host publication12th TAPPI Advanced Coating Fundamentals Symposium
    PublisherTAPPI Press
    Pages415–425
    Publication statusPublished - 2012
    MoE publication typeA4 Article in a conference publication
    EventTAPPI Advanced Coating Fundamentals Symposium - Loews Atlanta Hotel, Atlanta GA
    Duration: 10 Sep 201212 Sep 2012

    Conference

    ConferenceTAPPI Advanced Coating Fundamentals Symposium
    Period10/09/1212/09/12

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