1989 Volume 30 Issue 1 Pages 35-41
This paper is to investigate the relation between the soap concentration of bulk wash liquid (sodium oleate solution) and the detergency of foam washing. By the use of a C type of foam washing machine of our own make, the effects of the concentration on the foaming property and the relations between the concentration in foam and in residual liquid were studied. Furthermore, the detergency of foam washing and that of immersion washing were compared by the use of natural dirt on the collar and artificial cluster dirt. Following results were obtained.
1) It was found that both a mass of stable foam and high detergency were obtained in the concentration of bulk liquid as high as 0.3%. But foamability was lowered, foam film formed was thin, and the detergency decreased in the concentration of less than 0.3%, though the concentration in foam is greater than that of bulk liquid by foam fractionation action.
2) In the case of the bulk soap solution containing 0.1% of sodium methasilicate, good foamability and the relatively high detergency were obtained in the soap concentration ranging from 0.05 to 0.2%.
