Abstract
The hair applied oils such as hair cream and hair oil feels supple, soft and manageable. In this paper, the change of the softness (flexibility) of oil coated hair accompanied with the change of enviromental humidity is studied by means of the bending length measurement. The effect of oils on the softness is compared with that on vapor permeability of its film. Resultingly, it becomes clear that the oil whose permeability is small keeps the large softness of moistened hair in dry atomosphere. And it is concluded that the oil on hair affects not only on the friction and tackiness of hair surface but also on the softness (flexibility) through the medium of water vaqor loss.
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