抄録
The JIS method for assessing the soil removal efficiency was used in this study in order to complement the Bandle test which is used as a practical method for assessing the efficiency of synthetic detergents for home laundry. In this study, sodium sulfate was used as the balance component in the JIS index detergent combination containing 17% sodium tripolyphosphate, and a comparative study was made on the soil removal efficiency of 6 different types of detergent powders for home laundry prepared by mixing reduced phosphates with substitutes, such as, zeolite and trisodium imidobissulfate (TSIS).
As a result it was found that the removal efficiency was definitely lowered when the amount of phosphate was reduced only, however, when the amount of phosphate was substituted by Zeolite, the lowering of the removal efficiency was not so pronounced. When the whole amount of phosphate was replaced by zeolite, the removal efficiency of the detergent was lower than when phosphate alone was used, although the Zeolite containing detergent exhibited some removal ability. When half of the amount of phosphate was replaced by TSIS, the removal efficiency was very near that of JIS index detergent, however, it is thought that confirmation by the Bundle test is necessary.
