Factors Affecting Screening Efficiency in Vibrating Screens

March 12, 2020

Vibrating screens are helpful in many processing industries. From mines, chemical plants, down to cement plants, these screens can filter and classify different particles according to their size. Aside from filtering and classifying, vibrating screens can also be used to separate, sift, and dewater raw materials.

The screen efficiency of a vibrating screen refers to the quality ratio of the screening product to the material being processed in the feed. If a vibrating screen has a great screening efficiency, it will surely consume lower energy and perform at a more reliable and consistent condition. After all, the production efficiency of a vibrating screen relies on its screening efficiency.

In measuring screening efficiency, you must only consider the following main factors.

Screen Plate Properties

The screen plate is the area where the materials are placed for further processing. This plate has four characteristics that can affect your overall screening efficiency.

  • Opening rate:The opening rate is the ratio of the screen hole area to the screen panel area. If your screen plate has a high opening rate, then your screening efficiency and production capacity will also be high. However, this type of screen plate can shorten the life of your screen panels.
  • Hole shape:From the opening rate of your screen plate, the shape of the hole can also vary from one plate to another. Whenever you choose the hole type of the vibrating screen, you must consider the shape of your material so that your vibrating processes will go smoothly.
  • Size:Screen plate sizes also vary depending on your needs. The recommended ratio of length to width of the plate must be within an appropriate range of 2.5 to 3.
  • Inclination:The most recommended inclination angle of shaker screen is between 0° to 25°, while fixed shaker screen must be tilted between 40° to 45°. If the inclination angle is too low, then the production capacity will be low too. The screening efficiency will be low as well if your inclination angle is too large.

Material Properties

Materials that will be processed through vibrating screens can also affect your screening efficiency. Since they are made up of different types of particles, then here are some characteristics that affect screening efficiency.

  • Size:If the materials have a particle size of 1 to 1.5a, then they can be easily stuck in the screen hole of the vibrating screen. Once they are stuck on the area, other materials will be having a hard time passing through the screen hole, affecting the efficiency of the screening process.
  • Shape:Particles that are spherical in shape can easily pass through vibrating screens with either square or circular holes. Strip, sheet, and polygonal materials, on the other hand, can easily pass through rectangular hole shaker screens.
  • Water content:In dry screening, materials with high moisture content are easier to accumulate on the screen holes, which can block them altogether. Their blocking capability can reduce the screening efficiency by a huge percentage.
  • Bulk density:The screening efficiency of vibrating screens will be directly proportional to the bulk density of materials.

Screening efficiency in vibrating screens is affected by numerous factors. From the screen plates down to materials, your screening efficiency will be high if you consider the aforementioned elements. If you have more questions, you can always call us at Hawk Machinery so that we can give you information about vibrating screens.

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