JOURNAL of the JAPAN RESEARCH ASSOCIATION for TEXTILE END-USES

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An extensive investigation has been conducted of the frictional behaviour between clothing fabrics and the human skin. The coefficient of friction of four kinds of fabrics on the human skin of an inner side of an arm of about one hundred women students has been determined by the declining method of G. Amonton or C. Coulomb. Fabrics slid along warp-or wale-wise direction. The contacting pressure was less than 15 g/cm². The coefficient of friction between fabrics and the human skin ranged from 0, 69 to 0.78 which were more than twice of a fiber-to-fiber coefficient of friction and more than several times of fabric-to-fabric coefficient of friction, suggesting that a fabric were difficult to slide on the human skin. The frictional behaviour between fabrics and the huam skin was similar to that of high molecular materials, showing the relationship : μ=αP^n-1. The differences in frictional behaviour have been found among stud ents. An index W/L, where W is the weight (kg) of the human body and L is the height (cm), is applied to express quantitatively the type of the human body. The curve showing the relationship between W/L and n-1 gives the minimum value near at 0.31 of W/L. This suggests that the index, n-1, represensts the characteristics of the human body. The ease of slippage of fabrics on the human skin differs by both the fiber composition and construction of fabrics.

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The effect of the concentration of the surface active agent, Aerosol OT (Sodium di- (2-ethylhexyl) sulfosuccinate) and the amount of water solubilized in the ligroin has been studied on the soiing of cotton and wool fabrics in a drycleaning procedure. The Orange II, a water soluble dye, has been used as a model.
A soluble dye issolved in the ligroin solution is distributed both into the water in the micelles of the Aerosol OT and the into the absorbed water by fibers. A linear relationship has been found between the dye concentration [D] _s in the solution and the dye concentration [D] _f in fibers. The partition coefficient [D] _f/ [D] _s increases with increasing the amount of solubilized water and with decreasing the concentration of the Aerosol OT. The soiling of the water soluble dyes begins in the Aerosol OT solution at 1.5 in molar ratio of the water to the surface active agent or at 50% in solvent relative humidity. The soiling occurs remarkable at more than 2.8 in molar ratio and at more than 72% in solvent relative humidity.

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