New Progress of Rheology in Industrial Field, Contribution to Development and Enlightenment in Psychorheology

Abstract

We have tried to measure purely mechanical sensory feelings of cosmetics with using commercial rheometers. To ob-tain mechanical parameters relating to the score of sensory feeling, we have to measure under the same condition during the evaluation of sensory feeling, that is, the movement of finger and the structure of cosmetics. Sensory feelings of made-up skin can also be measured using stress-controled rotaional rheometers if we fix a measuring part of human body without stress. Understanding the rheological properties of cosmetic emulsions is helpful to design a new product with a desired sensory feeling. Emulsions with high dispersoid concentration have yield point, but high concentration linear polymer solution dose not. This was qualitatively explained with the difference in mobility at the contact point between dispersoids.