Abstract:

The influences of washing conditions such as cloth base, washing concentration, bath ratio, water quality and water temperature on the softness by the use of fabric detergents were studied, and the grading of products under the condition of the testing method was studied. The results showed that white knitted cotton cloth should be selected as the test base. The testing mass concentration of softener was 1 g/L. Under this condition, different products could be graded. The test conditions to evaluate the softness for the washing liquids were as follows: at （30±1） ℃, 5 pieces of cloth were put into the washing solution with the mass concentration of 2 g/Lprepared by hard water and washed for 4 cycles. The results under the test conditions were stable and reliable. Different products could be well distinguished within a certain range. When the performance of some products was close to each other and it was impossible to distinguish them by four washing cycles, the washing cycles could be appropriately increased to distinguish them.

Key words: softener, laundry detergent, softness, evaluation method