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

A4 Conference proceedings

Internal Authors/Editors

Publication Details

List of Authors: Joel Songok, Douglas Bousfield, Cathy Ridgway, Patrick Gane, Martti Toivakka
Place: Atlanta, GA
Publication year: 2012
Publisher: TAPPI Press
Book title: 12th TAPPI Advanced Coating Fundamentals Symposium
Start page: 415
End page: 425


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.

Last updated on 2019-19-10 at 03:28