Abstract
Throstle spinning, “Gara-bo” Spinning, is one of the spinning methods. The stuffer tube charged with the rawmaterial is a main part of the spinning process, and throstle-spun yarn is produced by repeating the rotation and the vertical motion of the stuffer tube. Two essential motions of the stuffer tube and the subsequent changes in the twist level of the yarn produced by those motions were analysed. In order to clarify the characteristics of the yarn irregularity, the effects of the stuffer-tube motion on the yarn count and the twist level of the yarn were observed and discussed. It was shown that the yarn formation and the thickness variataion in the throstle-spun yarn was determined by the relation between the number of gripped fibers and the twist level of the yarn in the vertical motion of the stuffer tube.
