|GD - Online||H. Tronnier et al.: Frictiometry on human skin|
|Druckseite oder Abstracts 2002||
H. Tronnier, M. Wiebusch,
Institute for Experimental Dermatology,
University Witten/Herdecke, 58455 Witten, Germany
The measuring head contains a DC micro motor, which is controlled rotationally (50 80 revolutions/min) onto which a variable Teflon sensor head (0 10 mm) can be placed via an exchangeable spring. The skin contact force of the rotating sensor is determined inductively with the spring constant and the compression. The torque, i.e. the circular friction an the skin surface, is measured via the motor load current and is shown as a voltage drop.
While water increases the frictionary resistance of the skin, depending an their galenic (lipid proportion) skin care products lead to "smoothing" of the skin. This is more pronounced an dry than an normal skin.
The frictionary resistance an dry skin is lower than an moist skin.
The effect of a W/O emulsion is not only greater, but it also lasts longer than the effect of an O/W emulsion.
The frictionary resistance is increased an moist skin.
Depending an the material and e.g. their moistness, textiles, fleeces, etc. increase the frictionary resistance of the skin.
In comparison to an untreated sample, paper tissues containing additives, for instance, can reduce the frictionary resistance and thus also irritation.
The SELS procedure facilitates a differentiated analysis of friction irritations.
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