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

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

    Tutkimustuotos: Artikkeli kirjassa/raportissa/konferenssijulkaisussaKonferenssiartikkeliTieteellinenvertaisarvioitu


    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.
    AlkuperäiskieliEi tiedossa
    Otsikko12th TAPPI Advanced Coating Fundamentals Symposium
    KustantajaTAPPI Press
    TilaJulkaistu - 2012
    OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisuussa
    TapahtumaTAPPI Advanced Coating Fundamentals Symposium - Loews Atlanta Hotel, Atlanta GA
    Kesto: 10 syysk. 201212 syysk. 2012


    KonferenssiTAPPI Advanced Coating Fundamentals Symposium