Friction Dynamics of Coating Process of Nail Enamel

  • SAWADA Ayane
    Department of Biochemical Engineering, Graduate School of Science and Engineering, Yamagata University
  • SANO Momoka
    Department of Biochemical Engineering, Graduate School of Science and Engineering, Yamagata University
  • NONOMURA Yoshimune
    Department of Biochemical Engineering, Graduate School of Science and Engineering, Yamagata University

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Other Title
  • ネイルエナメル塗布プロセスにおける摩擦ダイナミクス
  • ネイルエナメル トフ プロセス ニ オケル マサツ ダイナミクス

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Abstract

<p>Brushes are used in various make-up processes. However, there are few reports on quantitative analysis of movement and mechanical stimuli in the make-up process, and factors that control the usability of the make-up tool. In this study, we developed a system consisting of a high-speed camera and a mechanical evaluation device to evaluate motion and vertical/friction forces when a subject draws a line on a nail-tip with a brush. Here, we analyzed the relationship between movement and finish when 20 subjects drew a line using a commercially available nail enamel on a tip. The mechanical data suggest that the adjustment of the strength of the force and the angle of the brush, and the stable application process in which the vertical force gradually increases are important for drawing a straight line with uniform width. The present findings are useful to show the controlling factors of make-up cosmetics.</p>

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