Roller Drafting of Blended Sliver Composed of Long and Short Fibers

The roller drafting process of the blended sliver composed of long and short fibers was studied in order to clarify the mechanism that causes the blend irregularity. The relationship between several factors was formulated. By using this formula, delivery sliver thickness was calculated from the feed sliver thickness. Experimentally the blended sliver was drafted and sliver thickness was measured. Experimental results agreed well with calculated results. It was clear that the velocity-change-point of short fibers was different from that of long fibers and variation in the velocity-change-point of short fibers was larger than that of long fiber during the roller drafting process of the blended sliver composed of long and short fibers.