INCLINED OPENER is one of the most effective cotton cleaning machines. Six beating cylinders have been placed in steps. As the cylinders carry the cotton fibers. upward, waste material is thrown out of the grids below the cylinders. It is possible to adjust the cleaning effect by limiting the pass of cotton between the cylinders with adjustable metal screens placed between them. Damage to the fibers is avoided by the special shape of the beaters. Underneath each of the six beaters there are grids, adjustable from the outside. By adjusting these grids, the amount of waste material thrown out can be adjusted according to the amount of foreign matter in the cotton being processed. The waste material that falls out to the bottom of the machine can be continually removed by a fan.