Abstract
The behaviors of natural fatty soil extracted from soiled cloth and its model substances on polyethylene in various washing solutions were observed. Rolling up phenomenon did not occur for the natural fatty soil placed on polyethylene in 0.1 % NaDBS aqueous solution. It was observed that the small liquid drops removed continuously from soiled surface in aqueous solution of alkaline builders such as STPP and sodium metasilicate. Any change for the state of soil model substances such as tristearin, stearic acid and paraffin wax was not recognized in all solutions. However, rolling up phenomenon was observed for the squalene in aqueous solutions of both NaDBS and STPP. The change of behaviors of mixtures having various compositions between squalene and oleic acid was also observed as a function of immersion time in aqueous solutions of both NaDBS and STPP and of 1 : 2 mixture of NaDBS and STPP. Further, the mechanism of the removal of the fatty soil wa discussed.
