SCREEN Russian patent published in 2012 - IPC B07B1/18 

FIELD: process engineering.

SUBSTANCE: invention relates to construction sand classifiers and may be used in mining, construction and agriculture. Proposed screen comprises sieving surface arranged between end jaws, drive, loading and unloading appliances. Sieving surface is made up of five and more perforated convex curved bands bent in vertical plane in lengthwise direction and coiled along screw lines in crosswise direction on barrel-like mandrel to make screw lines and convex surfaces along sieving surface perimetre with centre of curvature located there inside as well as lap joints inside said surface made up of screw perforated vanes along the entire length of sieving surface from loading side to unloading side.

EFFECT: expanded performances and higher efficiency.

8 dwg