Sieve Bend Screen – Curved Surface for High Filtering Efficiency

Sieve bend screen, also named as DSM screen, is a curved concave wedge bar type of screens made of stainless steel wedge wires.

Wedge wire dsm screen is manufactured by welding the stainless steel V-shaped profile wires to the wedge wire support rods. Then the wedge wire panel screens are cutting and curved into wedge wire sieve bend screen with common 45°,60° and other degree arcs. At last, the wedge wire sieve bends will be inserted into a stainless steel frame for easy installation onto equipment.

Structures of Sieve Bend Screen

Wedge wire sieve bends are made of stainless steel wedge wires. They are consist of a concave curved profile wire screen, which are inserted into a stainless steel frame. The wedge wire sieve bends are manufactured by wrapping and welding stainless steel V-shaped profile wire and support rods. Then the panel screens are cutting and curved into arc screen. The wedge wire sieve bends have continuous slots, which has efficient filtering performance. Forces exerted as materials flows against the curved surface, curved screen structure has better filtering and greater capacity than the wedge wire screen panel.

A piece of sieve bend screen with stainless steel frame.

Working Principle of Sieve Bend Screen

DSM screen (sieve bend screen) is ideal for sizing and dewatering applications to remove solids from liquids or in solid/solid separation for dry feed situations. When the filtering materials flows against the sieve screens, Sieve bend screens can be manufactured into a variety of width, arc length and aperture to suit the flow rate and material sizing being separated. The feed materials are directed vertically and tangentially over the full width of the upper screen surface, then the material flows down the concave surface at right angles to the opening between wedge profiled wires. Wedge wire sieve bend screen has continuous slots, which supplies large open area and efficient filtering performance. Curved surface structure supplies higher flow rate, greater capacity and better filtering than wedge wire screen flat panels.

As a result, Thinner materials on the underside is deflected and passed out between the wires.

Two drawings show the working principle of DSM / sieve bend screen.

Specifications of Sieve bend screen

  • Material: stainless steel wire 304, 316, 316L, 321, etc.
  • Screen arc angle: 45°, 60°, 120°, 270° and 300°.
  • Slot size: 0.25 mm – 1 mm.
  • Two main typical product specification:
    • Type 1:
      • Panel width: 2000 mm.
      • Arc length: 1885 mm.
      • Angle: 60°.
      • Slot size: 0.5 mm.
      • Profile wire: 1.8 mm × 4.5 mm.
      • Support bar: 2 mm × 9.5 mm.
    • Type 2:
      • Panel width: 2000 mm.
      • Arc length: 1885 mm.
      • Angle: 60°.
      • Slot size: 0.25 mm.
      • Profile wire: 1.27 mm × 2.4 mm.
      • Support bar: 2 mm × 4.2 mm.
Specifications of wedge wire sieve bends
Item Radius (mm) Angle Width (mm) Slot size (mm)
WWSBS-01 2032 45° 914 0.25-1
WWSBS-02 2032 45° 1220 0.25-1
WWSBS-03 2032 45° 1524 0.25-1
WWSBS-04 2032 45° 1820 0.25-1
WWSBS-05 2032 45° 2134 0.25-1
WWSBS-06 2032 45° 2438 0.25-1
WWSBS-07 1016 60° 914 0.25-1
WWSBS-08 1016 60° 1220 0.25-1

Features of Sieve Bend Screen

  • High filtering, sizing, dewatering performance.
  • Good mechanical properties.
  • Great capacity than the traditional vibrating screens.
  • Corrosion and rust resistance.
  • High temperature resistance.
  • Low maintenance. It is easy to clean and need less maintenance.
  • Non-clogging.
  • Long and durable service life.
  • Easy to install and replace.

Applications of Sieve Bend Screen

The wedge wire sieve bends are mainly used for dewatering, sizing and waste water cleanup applications. They can be used in various fields, such as:

  • Sewage treatment.
  • Laundry wash water cleanup.
  • Poultry, fish, fruit and vegetable waste water processing.
  • Minerals processing.
  • Paper production.
  • Textile plants.

SIEVE BEND SCREEN WORKING PROCESS

SIEVE BENDS SCREEN PRODUCTION PROCESSING:

The Sieve Bend Screen comprises a concave static screen manufactured from non-blinding stainless steel wedge wire, with screen apertures oriented perpendicular to the direction of flow.

The wedge wire offers superlative filtering abilities with a precision-engineered structure that is non-clogging. It’s flexible and can be supplied in a range of sizes and profiles. The screen surface can be supplied in 304 or 316 stainless steel. A polyurethane option is also offered.

SCREEN APERTURES BETWEEN 0.35MM AND 5MM MAY BE PROVIDED IN DIFFERENT PROFILES FOR SPECIFIC APPLICATIONS. KEY CONSIDERATIONS INFLUENCING SCREEN SELECTION INCLUDE:

  • Particle size cut point.
  • Feed rate.
  • Solids concentration.
  • Maximum particle size or size distribution.

The Sieve Bend frame is manufactured from mild steel but can be custom-made in other materials such as stainless steel or carbon steel if required.

HOW SIEVE BEND SCREEN WORK?

Solids-bearing liquid (or slurry) is poured into the feed box and overflows onto the screen. The sharp, leading edge of each wedge wire slices away a thin layer of water and small-particle solids.
Larger particles continue down the screen surface until most of the liquid is removed. The size of particles separated is determined by the size of the coal particles and their settling velocity in the liquid.
Separation size, in most operations, is usually about half the size of the screen aperture.

WELDED WEDGE WIRE CONSTRUCTION OPTIONS:

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Crude prefiltration with sieve bend filter

In some horticultural growing systems applying recirculation, large volumes of drainwater are produced. Particles and fibers flush with the drain water from for example tray- and container fields in strawberry and ornamental horticulture as these crops are still grown on peat or coir. Before collecting the water in a filthy drain silo it is necessary to remove these particles.
A sieve bend screen filter can be applied to remove particles from 0.1 to 2 mm from water streams varying from 2 to 100 m³ h-1. A sieve bend screen filter can be placed on top of a silo and separates the floating organic material from the drain water. Without this filtration step, the silo would pollute quickly. The filter surface has a curved or parabolic surface with a large number of grooves. The big advantage of this construction is that the suspended solids, which are sieved from the water, will slide down the parabolic surface and are collected in a container while the water will flow through the grooves into the silo.
Sieve bend screen filters are made in several shapes and sizes. A small and frequently used model is the static sieve bend screen filter with a maximal capacity of 36 m³ h-1 and a groove width of 0.5 mm.