Functional surfaces produced by foam coating, TAPPI JOURNAL August 2016
ABSTRACT: This paper reports experiments on silica coating formulations that are suitable for application as a thin pigment layer with foam coating technique on a paper web. To understand the foaming properties of nanosilica dispersions, the critical micelle concentration, foam half-life time, and foam bubble size stability were determined with three different foaming agents. The results indicate that the bubble stability measurement is a useful characterization method for foam coating purposes. Pilot foam coating trials were done and the effects of the chosen foaming agents were studied on the properties of the nanosilica-coated paper. The surface hydrophilicity of silica coated paper was related not only to silica pigment, but also to the chemical nature of the foaming agent. Standard paper properties were not affected by the thin silica coating.
Application: Foam half-life time and bubble size growth determination are useful tools when creating stable foam for foam coating. Mills can adjust properties of foam coated surfaces through selection of the coating compound and the properties of the foaming agent.
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