Evaluation of detergents for washing fabrics

Abstract

AbstractVarious methods are used today to check the washing effect of detergents. They differ mainly in whether the cleaning assessment is determined by the use of artificially soiled test fabrics, anonymous naturally soiled laundry in a single wash test, or new family bundles in multiple use and wash test series. Correlation of the information based on the actual field behavior of the different methods is discussed. Applicability of the different systems will depend on the special conditions which call for abbreviated procedures. Multiple use and wash tests are very close to practical use, give information about cumulative effects and thereby allow the detection of small differences. Their disadvantages are high costs and length of time for the test. For a realistic evaluation from a consumer viewpoint, they are of little significance without a ranking scale correlating to consumers’ appraisal. Classification of tested products depends on the kinds of textiles in the family bundles which are used in the detergency evaluation. This factor is important in the detection of correlations between the two methods. For product evaluation and especially for overall quality ratings, the use of test fabrics is satisfactory if a carefully selected combination of these is chosen. Taking into consideration empirical data obtained with standard formulations, one can obtain satisfactory results corresponding to consumers’ appraisals. Stain removal and soil redeposition have to be given the same weight as soil removal. An overall investigation of possible correlations is lacking so that some uncertainties still remain.