Abstract
New automatic washing machines for home use with different load capacities were studied. Variation in liquor ratio on detergency was investigated using artificially soiled test cloths (JIS C 9606, Testfabrics type A-A and WFK type 10D). The effect of lowering this ratio on amount of detergent was examined so as to determine optimal conditions for soil removal.
Detergency decreased with reduction in the liquor ratio for large automatic washing machines as also noted for standard. Detergency decreased with increase in standard loading capacity. The amount of detergent to maintain 38.6% detergency was determined as following based on soil removal with standard automatic washing machines,
y=4.56x+13.8
where y is amount of detergent and x, clothing weight. This equation gave values greater than those determined from the adsorbed amount of LAS on cloth, a factor known to lessen detergency.
