The article considered mathematical model that describes the separation of large and small trash by weight of cotton, with elastic
connection on the cotton. The relationship between the forces acting on the speck on the angular velocity and the radius of the working drum
cleaner, laws of motion specks obtained on the surface and inside the cotton mass on the process parameters.
Keywords: Pulp; Speck; Elastic element; The force of the bunch; The dry friction force; Kolkova drum; Surface netted; The angular velocity