1987 Volume 28 Issue 2 Pages 85-90
A calorimetric technique has been devised for measuring the total energy input into washing systems. Using this method, mechanical energy input is measured and related to soil removal and fraying of cloth in a pulsator-type washing machine, using the standard cotton cloth soiled with carbon black. The relationship between mechanical energy input and soil removal, and that between mechanical energy input and fraying of cloth are considered for a number of situations involving variations in bath level, bath ratio and washing time. The summary is as follows:
1) An assumption is made that the energy input to the cloths corresponds with the energy increase due to the addition of cloths into the washing system. Then the energy increase per unit weight of the cloths decreases with a decrease in bath ratio.
2) Detergency and fraying of cloth are both determined by the energy increase per unit weight of the cloths, irrespective of bath level, bath ratio or washing time.
3) A correlation is observed between detergency and the logarithm of fraying of cloth, irrespective of bath level, bath ratio or washing time.
