The article presents research materials to ensure an increase in the intensity of purification of raw cotton from fine litter in a ginnery. It is indicated that in existing cleaners of raw cotton from impurities, the process is mainly carried out due to the shock-disintegrating effect of the working bodies of the machine on the processed material. To improve the efficiency of cleaning raw cotton from fine litter, it is proposed to use a cleaner with different types of working bodies, and such a combined fine litter cleaner consisting of a ring and screw working body has been developed. Experimental studies have found that with the use of such a cleaner there is an increase in the cleaning effect by 5% (abs.). The theory of the movement of an isolated material point (leafjets of raw cotton) in a screw working body is considered. It has been determined that at an optimum angle of elevation of the helix, the maximum axial speed and productivity of the screw working body of the cleaner are ensured. It is indicated that the critical radii establish the boundaries of the regions where the material particles acquire the screw angular velocity ω_0 and their axial displacement ceases.