| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for evaluating flexibility of a hair, which can highly accurately evaluate the flexibility of the hair while considering a cross-sectional structure of the hair and can evaluate the flexibility of the hair by relating an elastic modulus of the hair to an inner structure of the hair. <P>SOLUTION: A cross-sectional shape of a hair having a cross-sectional structure composed of a plurality of layers is measured, and when the cross-sectional shape is approximated to an ellipse, a major axis and a minor axis of the ellipse are found out. One end of the hair is fixed and relation between load P and displacement of the hair on a predetermined distance l from the fixed position along at least either one of the major axis and the minor axis is measured. An inclination SE of a graph obtained when setting a horizontal axis as displacement and a vertical axis as Pl<SP POS="POST">3</SP>/3I (I is cross-sectional secondary moment to a load direction of load P) and plotting measurement values is found out, and the elastic modulus and/or thickness of each layer of the hair is evaluated from the inclination SE. <P>COPYRIGHT: (C)2013,JPO&INPIT |
