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Family and Consumer Sciences Research Journal
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Improving Knit Fabric UPF Using Consumer Laundry Products: A Comparison of Results Using Two Instruments

Jihyun Kim

Virginia Polytechnic Institute and State University

Janis Stone

Iowa State University

Patricia Crews

University of Nebraska

Mack Shelley, II

Iowa State University

Kathryn L. Hatch

University of Arizona

This study investigated the use of two instruments to measure the ultraviolet protective factor (UPF) of T-shirt knit fabrics. After various laundering treatments, specimens were cut and UPF was measured from the wale, course, and bias directions with the ISO MET® UV-Meter and the Cary UV-Visible Spectrophotometer. Similar results were found between the two instruments and among repeated measures. Before UPF measurement, the shirt fabrics were repeatedly laundered using various household detergents and laundering additives commonly available to consumers. Statistically significant effects on the mean UPF values were found related to type of fabric, type of detergent/laundry additives, number of repeated launderings, and interaction effects of combinations of the three factors. Consumers can improve the UPF of their cotton and cotton-blend clothing by using detergents with brightener and/or products containing ultraviolet absorbers. Conclusions and implications for educators and apparel and textiles industry are provided.

Key Words: ultraviolet radiation • knit fabrics • laundering • UV-absorbers • optical brighteners

Family and Consumer Sciences Research Journal, Vol. 33, No. 2, 141-158 (2004)
DOI: 10.1177/1077727X04269185
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