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Tribology International, Volume 63, July 2013, Pages 8-13.
Ken Nakano, Kunio Kobayashi, Keisuke Nakao, Ryuta Tsuchiya, Yuko Nagai
Faculty of Environment and Information Sciences, Yokohama National University, Yokohama 240–8501, Japan
Beauty Cosmetics Research Laboratory, Kao Corporation, Tokyo 131–8501, Japan
Abstract
To develop objective estimation methods for the tactile sensations experienced during the application of liquid cosmetic foundation (i.e., emulsion foundations (EFs)), a tribotester based on the mechanical properties of human skin was used in lubrication experiments with EF samples. From the time-varying signals of the tangential spring deflection obtained in reciprocating rubbing tests for small sample amounts, trajectories (i.e., plots of the tangential spring deflection against the tangential drive position) were obtained. Using characteristic trajectory shapes (e.g., a shape like a ribbon with jagged edges) makes it possible to evaluate the similarity of vague tactile sensations without sensory testing.
