Full definition
A machine that separates bulk material by particle size using one or more vibrating screen decks (mesh, plate, or modular media) that allow undersize particles to pass through while retaining oversize on top. Vibration (3-6 mm amplitude, 700-1,200 RPM, circular, linear, or elliptical motion) keeps material moving across the screen surface and prevents blinding (plugging of openings). Screen media types: (1) Woven wire (steel — most common, lowest cost, best open area), (2) Polyurethane panels (modular, 85-95 Shore A — 3-5x wire life in fine screening, self-cleaning, lower noise), (3) Rubber panels (NR or SBR — best for coarse screening with heavy impact, noise reduction), and (4) Perforated plate (thick steel or PU-covered — for very coarse scalping). Screen opening sizes: 0.075 mm (200 mesh) to 200+ mm. Capacity depends on deck area, opening size, and material characteristics. Types: inclined (15-25° — traditional, gravity-assisted), horizontal (lower height, better efficiency), banana screen (variable slope — highest capacity per unit area). Brands: Metso Outotec, Sandvik, Deister, Derrick (fine screening), and Schenck. PU and rubber screen panels are manufactured by Metso, Tema Isenmann, Polydeck, and Sandvik. Per CEMA and mining OEM specifications.