Patent ID: 8733552

Claim:
A cylindrical sieve, comprising: a cylindrical sieve body made from a corrugated plate having wave crests formed along an axial direction of the cylindrical sieve and wave troughs formed along the axial direction of the cylindrical sieve, said wave crests and said troughs being arranged alternately along a circumference of the cylindrical sieve, wherein a large number of apertures having an oval shape with a longitudinal axis aligned in the axial direction of the cylindrical sieve are formed in the corrugated plate; the respective apertures are formed in an identical shape and in identical dimensions; the apertures are formed evenly over the sieve body; the horizontal to vertical ratio of the apertures is in range of 2:1 to 10:1; the sieve body has an aperture ratio of 30 to 60%; the apertures are arranged such that the longitudinal axes of the respective oval apertures are arrayed in the axial direction of the rotating shaft, one array of the apertures is shifted in position in the axial direction from an adjacent array of the apertures.