Thesis Details

Thesis Title: Development of polypropylene/cotton yarns for use in single-jersey knitted fabrics
Thesis Author: Amy Usborne
Abstract: The use of polypropylene staple fiber in apparel fabrics has grown, in part, because of improvements in the fiber's properties. The development of fabrics constructed from polypropylene/cotton yams is in response to consumer demand for fabrics that have improved performance and comfort characteristics. Ideally, fabrics constructed from polypropylene/cotton yams will contain the light-weight, strength, and wicking attributes of polypropylene, and the absorption and dyeability of cotton. Possible end-uses for this blend are athletic wear and socks. In this study, a number of ring and rotor yams were spun from polypropylene and cotton. These included polypropylene/cotton blended yams (blends of 33/67, 50/50, 67/33), 100% cotton yams, and 100% polypropylene yams. Two deniers (1.25 and 1.80) and two lengths (25.1 mm and 32.0 mm) of polypropylene fiber were used. The characteristics of the yams were documented. Yams were knit into single-jersey fabrics, and fabrics were dyed. The comfort, performance, and aesthetic properties of the knitted fabrics, including air permeability, wickability, hand, pilling, appearance, moisture content and color depth were analyzed. General findings were that yam and fabric strength improved at levels of 50 percent polypropylene and greater. Fabric appearance was preferred as the percent of cotton increased in the blend, and fabrics made from the rotor yams had a preferred appearance over those made from the ring yams. The moisture content of the fabrics increased with the percent of cotton in the fabric. Wicking results reflected the moisture absorption properties of the fibers.