Abstract
The authors have studied the shape and parallelization of fibers in slivers and rovings and drafting-induced changes in parallelization and shape. Short dyed yarns were used as tracers in the observation of the shape of fibers. The Orientation Index (O. I.) was measrued by modifying Lindsley's method, but the measuring was made in the directions of plus (O. I. (+)) and minus (O. I. (-)).
Our inquiry has shown that the straight fibers in a sliver and the mean value of their O. I. increases by drafting, but there seems to be a sizable difference in quantity between fibres with leading hooks and fibers with trailing hooks. There is also a difference in value between O. I. (+) and O. I. (-). These differences. however, decrease gradually in the subsequent processes.
The results of our experiments guggest that O. I. (+) and O. I. (-) had better be measured and discussed separately. We also find that the direction in which slivers are fed has a considerable bearing on the quality of finished yarn.
