An experimental method to study the absorption capacity of paper towels, TAPPI Journal April 2021



 Application: The proposed method enables study of the wetting process on the fiber surface by distinguishing the dynamic and static wettings. It facilitates accurate comparison of the absorption capacity of paper towels while giving detailed information on the two-dimensional wetting process.

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Author: Hossein Abedsoltan
An experimental method to study the absorption capacity of p
ABSTRACT: This study proposes an experimental method for the in-plane liquid wicking to determine the absorption capacity of retail paper towels. Individual plies of the paper towels were tested to minimize the transverse wicking effects on surface wetting. The method involves arbitrary point source injection of liquid into the paper towel surface while recording microscopic images of the wetted areas as liquid spreads. The samples were selected from two main manufacturing processes: conventional wet pressing and through air drying. The tested liquids were water and decane with various driving forces. Two distinct imaging systems, infrared light absorption imaging and visible light transmission imaging, monitored and recorded the wetting process. The wetted regions were calculated to generate the wetting graphs, which illustrate both the dynamic and static wetting behaviors. It was found the amount of driving force has a negligible effect on the maximum wetted area formed on the surface. So, the maximum wetted area and the paper grammage were applied to determine the absorption capacity of the tested towels. Moreover, the absorption capacity results were validated by the basket-immersion test method (ISO 12625-8). Therefore, the proposed method in this work enables quantification of the absorption capacity of paper towels.
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