Abstract
Measurement of the amount of calcium present in cotton fabrics, evaluation of the individual calcium contents in the actual washing liquors for the several washing conditions and several detergency tests were conducted, to clarify how calcium existing not only in water used for washing but also in cotton fabrics to be washed does affect on detergency. Calcium content in cotton fabrics was found to range from 80 to 600μg/g·fabrics. When the water hardness is low, the ratio of the calcium content in the fabrics to the total calcium content is high, so that the extent of influence caused by calcium present in the fabrics on detergency is relatively high. The detergency tests made clear that the calcium content in cotton fabrics has no influence on detergency at the higher water hardness, but it does have a negative influence at the lower water hardness.
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