Rotor spinning involves the separation of fibers by rigorous drafting and the then recollection and twisting of fibers in a rotor. The draw frame sliver is presented to a spring loaded feed plate and a feed roller. A combing roller covered with saw tooth wire clothing then individualizes fibers within the sliver. Once opened, the fibers pass through a transport tube in which they are further separated and parallelized before being deposited on the inside wall of the rotor. Centrifugal forces, generated by the rotor turning at high speeds, cause the fibers to collect along the walls of the rotor, forming a ring of fibers. This fiber ring is then swept from the rotor by a newly formed yarn, which contains untwisted fibers. With each rotation of the rotor, twist is inserted, converting the fiber bundle into a yarn as it is pulled out of the rotor through a navel. The yarn is then taken up onto a cross-wound package, thus separating the winding process from twisting. As the yarn is drawn from the rotor, some fibers lying at the peeling point may wrap around the yarn, resulting in the formation of random wrapper fibers, which are the characteristic of the open-end yarn structure. The rotor-spun yarn has a three-part structure, with a relatively dense core (80-90% of fibers), a loose but a continuous sheath that wraps around the core (5-20% of fibers) and tightly wound surface coils as wrapper fibers (0.5-2% of fibers). The fiber configuration in the rotor yarn is not nearly parallel as in the ring yarn. These factors make rotor yarn bulkier, and the non parallel fibers explain the inferior tensile properties. The relatively straight core fibers combined with the sheath core structure make the yarn more rigid in terms of tensile and bending properties. The yarn is weaker than ring yarn because of its three-part structure, poor fiber extent and less intensive fiber migration. The yarn is however more uniform as compared to the ring yarn because of the short-term mass leveling action that occurs inside the rotor. Rotor yarn exhibits the properties of high extensibility and elasticity, good abrasion resistance and good insulation properties. But at the same time the limitations faced by the rotor spinning include the requirement of finer and shorter fiber. Extensive opening operation leads to a lot of fiber breakage, especially if the fibers are crimped, thus shorter fibers result in a comparatively weaker yarn. Fiber extent also reduces due to bending and buckling of fibers resulting in poorer strength.