Studies on the Soil Removal of Naturally Soiled Neck-Collar Cloths

Part 1: On the Detergency of Laundry Detergents in Multiple Cycle Test Method

Abstract

This study aims to make clear the relationship between washing ability of detergents for clothings and the number of wash-wear cycles. In the washing test, naturally soiled neck-collar cloths have been laundered under the conditions of home laundering with soap or syndets.
Experiments have revealed that although soaps, as compared with syndets, show the high detergency in the first laundering, soaps decrease their detergency with increasing unmber of wash-wear cycles. The amount of Ca-soap deposited on neck-collar cloths has increased with increasing the number of wash-wear cycles. The amount of soils deposited and remained on neck-collar cloths has also increased with increasing the, amount of deposited Ca-soap.
Thus, the lowered detergency of soaps in the wash-wear cycles can be explained by the amount of Ca-soap deposited on the neck-collar cloth which has remarkable effect on the soil deposition and washing ability of detergents. As differences in soil removal have been recognized between the result of first laundering and wash-wear cycle test, a wash-wear cycle test is important to get the detergency agreed well the test result of consumer test.