Abstract
Comparative studies were pursued on the washability of various fabrics soiled by different kinds of particulate dirt and redeposition of the dirt to the fabric.
Tested fabrics were cellulose acetate, polyamide, polyacrylonitril, polyester, polypropylene and cotton. Carbon black, ferric oxinate, bentonite modified by oleophilic radicals and rouge (ferric oxide) were chosen as particulate dirt. Detergent solution contained anionic or nonionic surfactant with builders but no optical brightner.
The following results were obtained.
(1) From hydrophilic fabrics, hydrophobic particulate dirt was removed more easily than hydrophilic dirt and from hydrophobic fabrics hydrophilic dirt was easier.
(2) In nonionic detergent solution very slight redeposition was observed. The largest redeposition in these experiments was found on polypropylene fabrics with ferric oxinate and carbon black in the anionic detergent solution.
