Abstract
Following the previous paper, the effect of repeated shearing stress on fabrics in washing bath was examined under the same experimental conditions. Carbon black and six kinds of fatty or oily materials (palmitic acid : P, oleic acid : O, glycerol tripalmitate : TP, glycerol trioleate : TO, solid paraffin : SP and liquid paraffin : LP) were adopted as a component of artificial soil.
The results obtained were as follows :
1. p value which is the ratio of repeated shearing stress effect to detergency were observed under different shearing speed at each kind of oily components; P : 31 , 70%, O : 3466%, TP;6186%, TO : 5474%, SP : 7293% and LP : 5479%.
2. It was suggested that repeated shearing stress on soiled fabrics exerted to peal away the film of solid fatty materials as well as to increase the effective surface of the fabrics in washing.
