What are Sieve Bend Screens?

A Sieve Bend Screen is also known as; parabolic screen, side hill screen, run down screen, gravity screen and DSM screen and is designed to separate liquids from solids. The sieve bend screen is a concave curved wire screen which is mounted on a frame. The openings of the screen are perpendicular to the flow. Curved screens have a greater capacity than a flat screen as force is exerted as material flows against the curved surface.

sieve-bend-screens

These screens are cross-flow screens and used in a variety of processes; food processing, waste water cleanup, corn wet milling, gold recovery, pulp and paper, surface water intakes, and coal preparation. The shape of the wires is slightly tilted so the leading edge is higher and increases the de-watering capacity.

 Uses for the Sieve Bend Screens

Sieve Bend Screens are used to either dewater or classify slurry (a semi-liquid mixture usually made up of fine particles such as; manure, cement or other combined mix that needs separation). Gravity forces slurry over the inclined screen surface where the wires are perpendicular allowing the slicing away of slurry in layers. Larger particles continue down the screen with most of the liquid removed. The narrowness of the wires creates a sieve that controls the flow for separation efficiency.

The Dutch State was the first to adapt the sieve bend in mine developments so it is sometimes referred to as the DSM. They have been developed to be used in a variety of ways to filter urban and industrial waste treatment plants. In this process they greatly reduce the loads by improving the performance of the Clarifiers where the solid particulates are removed from the liquids.

Features of a Sieve Bend Screen:

  • Space efficient
  • Energy efficient
  • Low maintenance
  • Easy to replace screen
  • Design is flexible
  • Quiet operation
  • * Sizing is accurate

A sieve bend screen requires no energy input making this system the most cost efficient process for the separation of any mixture of slurry.

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