Sieve Bend vs Flat Panel: When to Use Which

Sieve bends and flat panels are both used for dewatering and sizing, but they serve different applications and work on different principles. A sieve bend (also called a DSM or static unit) uses a curved profile and gravity feed to separate solids from liquids. Feed slurry flows by gravity over the concave surface. The Coanda effect causes the liquid fraction to follow the curved wire through the slots while solids travel across and discharge at the bottom. No moving parts, no power consumption. Typical throughput: 1-3 cubic meters per minute per meter of width. Key parameters: radius of curvature (typically 500-1500 mm), arc length, wire profile, slot aperture, and tilt angle. Wire tilt is especially effective on curved panels because the shearing flow it creates significantly increases liquid extraction. Flat panel screens are rectangular wedge wire surfaces mounted on vibrating decks, static drain platforms, or architectural installations. They rely on vibration or gravity (not flow dynamics) for separation. Support bar spacing is calculated for structural integrity under vibration loads. When to use a sieve bend: gravity-fed liquid-solid separation, dewatering slurries, starch extraction, sugar juice processing. Best where you need high throughput with no power input. When to use a flat panel screen: vibrating decks, sizing and grading on shaker tables, static drain applications. Best where the surface must withstand mechanical vibration or where planar geometry is required. The choice often comes down to feed method. If material flows by gravity across a curved surface: sieve bend. If material sits on a vibrating flat surface: flat panel.