In order to reduce the irregularities of sliver made from fine denier fibers, a method of pin-drafting utilizing a moving gill-faller bar was investigated. In the pin-drafting system, both the pin count and the pitch of the gill-faller bar are crucial in the control of staple fibers: the faller bar pitch affects the longitudinal direction of the sliver and the pin count affects it in terms of the width and thickness of the sliver. The effect of fiber control can be estimated by considering the number of fibers in/out of contact with the pins of gill-faller and the size of the group of moving fibers.
The experimental result for fine denier fibers showed that it is necessary to decrease the number of fibers out of contact with the pins of gill-faller and/or the size of the group of moving fibers by controlling the fiber density of the sliver.
