Patent ID: 8025152

Claim:
A sieve apparatus for screening a material containing fractions of a solid material and a fluid having a liquid fraction, said apparatus comprising: an outlet for fractions of the solid material separated from the material, and an outlet for fluid fractions separated from the material; at least one screen element having an upper side and an underside; at least one ultrasonic source located below the at least one screen element; an opened top container located below the underside of the screen element such that the opened top faces the underside of the screen element; the container further configured to receive at least a part of the liquid fraction such that at least a part of the underside of the screen element contacts the liquid fraction located in the container; and the at least ultrasonic source being located in the container and fully submerged in the liquid separated from the material, the liquid fraction thereby acting as an ultrasonic coupler between the ultrasonic source and the screen element.