1981 年 30 巻 7 号 p. 432-441
We developed an improved artificially soiled cloth by introducing a new method, which we called as an aqueous dispersion method.
Cotton cloth was dipped in the water in which oily soil, protein (gelatin), carbon black and clay had been dispersed. This clay, called as red-yellow diluvium, is developed on the diluvial upland in the Tokai district and is a typical diluvium in Japan. We chose it among many types of clay in Japan. After impregnating, the soiled cloth was squeezed by beefing passed through rubber-rollers, and then, in order to denaturalize protein, it was heated at 105°C for 30 min. We examined the behavior of soil removal from this artificially soiled cloth comparing with naturally soiled collar cloth and other artificially soiled cloth prepared from Hitachi-Lion dry method and organic solvent method.
We found that the new artificially soiled cloth behaved similarly to naturally soiled collar cloth under various washing conditions such as washing temperature, water hardness and polyphosphate dosage, and, furthermore, had an excellent sensitivity for evaluating detergency of some heavy duty powder detergents on the market.