ABSTRACT
The questions related to exploitation of selfcleaning sifting surfaces are closely associated with research of dynamic interaction of technological loading with elastic elements. Rubber ribbon-strings (RRS), used as such elements, on the geometrical parameters, behavior, constructional features essentially differ from beams. Many of them rather represent the thin-walled rods. Their structural features consist in possibility to sustain longitudinal elongations at torsion strains. Consequently, the longitudinal normal stresses, proportional to these strains, are reduced in each cross-section to system of balanced longitudinal forces. These, not examined in the theory of pure torsion additional stresses, arising owing to relative deplanation of cross-section, can reach rather great values.
