1998 Volume 47 Issue 5 Pages 501-508,526
The effects of lessening amount of liquor in home laundry on soil redeposition of new synthetic polyester fibers were examined during the cleaning artificially soiled cloth specimens (JIS C 9606, WFK type 10D) using a Terg-O-Tometer. The effects of fabric substrate structure on the soil redeposition in polyester fabrics with different deniers were also studied. Sodium alumino silicate (zeolite) performance as a detergent builder for phosphate-free synthetic detergents was evaluated through a washing test and the results were compared with those for sodium tripolyphosphate (STPP). The detergency decreased with reduction in the liquor ratio, as has also been noted for home washing machines. The degree of soil redeposition of polyester fabrics varied according to the soil components in a washing solution. When JIS C 9606 soiled test fabric was used, the soil redeposition of Shingosen was inversely related to the liquor ratio, and fine single polyester fabric fibers in the range of 0.20.4 deniers were influenced by the change of liquor ratio compared to conventional single fibers. The soil deposition of Shingosens was determined by the surfactant concentration in a washing solution, not soil components in a washing solution. On the other hand, when WFK soiled test fabric was used, a conventional polyester fabric showed higher soil redeposition than Shingosen. It was found that the soil redeposition of conventional polyester fabrics was determined by the soil components in a washing solution, not by the surfactant concentration, based on the fact that soil redeposition decreased with lessening the liquor ratio. The detergency of a zeolite for the detergent builder decreased with reduction in liquor ratio more rapidly than that of a STPP. The effects of the two detergent builders on the soil redeposition with decrease in liquor ratio were noted to be essentially the same.
