Proportion of Fiber Strength Utilized in the Single Yarn

The proportion of fiber strength utilized in the yarn spun under standard procedures of spinning adopted at the Cotton Technological Research Laboratory and at the United States Department of Agriculture Laboratories has been examined. It has been found that the proportion of fiber strength utilized in CTRL spun yarns of lower counts is lower than that utilized by USDAL—spun yarns of similar counts. However, there is little difference in the case of higher counts. The reduction in the former case has been attributed to adoption of the three-roller system of drafting in spinning at CTRL, and of the double-apron high-draft system at the USDAL, for lower counts. For higher counts the same system is em ployed at both places.

Incidently, it has been found that improved length and fineness of fibers increase the proportion of fiber strength utilized; however, the influence of fiber tenacity depends on the system of spinning adopted.