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Mechanical screening

Consistently and correctly sized material.

high frequency screens

Removing oversized debris and large particles or undersized ‘fines’

Vibrating screens

Filtering out particles on a ‘smaller than’ desired size basis.

high frequency screens

Removing oversized debris and large particles or undersized ‘fines’

Particle Separation

Screens Overview

The process of sorting particles into different groups based on their size, density, or other characteristics. It's used in many fields, including agriculture and mineral processing or beneficiation.

Once particle separation is done, the efficiency of the process is measured by the percentage of undersized particles still present in the oversized product.

Efficiency is determined by the degree of perfection of separation of the material into size fractions above or below the aperture size. It is a measure of how much of the feed material should have gone through the holes in the mesh versus how much really did go through the holes or apertures.

Numerous factors have an impact on efficiency and are categorised based on whether they pertain to the material itself or other influences.

Frequency, the most important determinant of efficiency - is the number of times the screen mesh peaks and troughs within a minute.

introduction to screens

Types of Screens

Static Free Fall Screens

A fixed screen is usually a static and steeply inclined, 35-50°, structure to assist material flow under gravitational forces with desired screen openings for sizing of the material.

Roller Screens

Roller screens are suitable for sizing coarse, moist, sticky or clayey raw materials. They are used as scalpers, pre-screening devices, for crusher relief and for control screening after the crushing process.

Rotary Screens

This type of screen consists of a cylindrical drum with a perforated plate or wire mesh attached to the drum to act as the screening media.

Vibrating Screens

Vibratory screens are mechanical devices that induce vibration to classify or separate a product into different fractions based on particle sizes by means of perforated plates, polyurethane panels and piano wire panels.

High Frequency Screens

These very specialised units induce vibration at 3 000 to 6 000 rpm frequency directly into the material through easily interchangeable wire mesh panels. Various aperture configurations provide unmatched versatility and adaptability.

Basic Screening Terminology

Screen Efficiency

The percentage of material that falls through a screen compared in relation to the total amount of material in the product stream of that size.

Frequency is the number of times the screen mesh peaks and troughs within a second. For a gyratory screening motion, it is the number of revolutions the screen deck takes in a time interval, such as revolution per minute, RPM.

Whilst there is no universally accepted definition of screen performance, the most common criteria used is efficiency, which is determined by the degree of perfection of separation of the material into size fractions above or below the aperture size. It is a measure of how much of the feed material should have gone through the holes in the mesh versus how much really did go through the holes or apertures.

dedicated to leading

Union High Frequency Vibrating Screen

The Union High Frequency Vibrating Screen very effectively bucks the trend in that dry screening below 850 microns and even down to 105 microns is achieved very effectively.

Our unique design and operating principles achieve unequalled results. That the majority of producers of agricultural lime use our screens is a testament to our success. Several clients with unique products in the minerals sector found Union Screens superior to the available alternatives and retrofitted processing plants with Union Screens..

In most bulk material processing plants, the material is vibrated to energise material and reduces the friction against container walls and overcome internal particle cohesion to effectively achieve particle separation.

Union Engineering is dedicated to leading the industry by integrating cutting edge mathematical formulas and technologies into the design and manufacturing of high frequency vibrating screens. These Our screens effectively separate size fractions ranging from 75 microns to 20 mm and more, all supported by comprehensive testing programs.

Engineered for purpose

High Frequency Screens Specifications

When screening is done, bulk material is separated into two or more products on the basis of either bigger than or smaller than a certain size hence the term ‘size control’.

stratification of particles on high frequency vibrating screens

Screen Applications

Agricultural High Frequency Screen Applications:

Mining High Frequency Screen Applications:

quality precision services offered

Union Promise

work excellence

Since 1952, Union Engineering has served the Agricultural, Mining, Transport and Construction sectors by providing precision engineered services and products.

Cost Effective

We supply cost effective metal engineering services and build 'fit for purpose' particle separation and sizing equipment that exceed customer expectations.

Custom Engineered

Our screens are custom designed and engineered to provide the perfect screen for each unique requirement and industry.

Modernisation

Providing low operating cost equipment for particle separation and sizing of materials solutions through in house developed and built, 'fit for purpose' high frequency screens.

Particle Separation