抄録
Multicycle JIS (K 3371) -test was investigated as a method for assessing the soil removal efficiency of laundry detergents. Each evaluation vas performed by visual judgment and quantitative determination of residual soil after each washing of the soiled test collar cloths.
Six detergents were used in this test, A : (the JIS index detergent, STPP 10% as P2O5) the standard detergent, B : (soap Powder), C : (STPP 0%), D : (STPP 5% as P2O5, Zeolite 8.5%), E and F : (no phosphate commercial synthetic detergents).
Four cycles of the “wear-wash” tests were repeated in accordance with JIS-test, and visual judgment was performed after each cycle. On the other hand residual soils of the test collar cloths after one and four cycles were determined by Iatroscan (TLC/FID) after extraction with benzene.
The results obtained are summarized as follows.
1) The visual differences of the soil removal efficiency were difficult to detect after once “wear-wash”, but became remarkable by multicycle JIS-test.
2) Evaluation by quantitative determination of residual soils agreed well with visual judgment, and could detect even small differences between each detergency which were difficult to discriminate by visual judgment.
3) The results of the comparison with A vs. C and A vs. D detergents in this test were extremely well correlative to those of bundle test and JIS-test in our previous reports.
