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Particle Separation

Particle separation through size differentiation as a science has seen enormous development and Union Engineering is at the forefront of this process with technology that energises only the screen decks themselves to save energy.

Cognisant of the factors that affect screening efficiency and capacity and through actual testing programmes, Union Engineering believes in designing and building the optimal fit-for-purpose High Frequency Screen to suit the needs for every application.

A Beginners guide to Particle Separation


The rate (tons-per-hour) at which particle separation can be done and the efficiency of the separation process (having as few particles outside the desired size range mixed in the product – expressed for example as the percentage of under size mixed with product) depends on a great many factors normally grouped in relation to whether it is related to the material itself or otherwise. These normally include:

1. Material related factors

These include, but are not limited to, the density, the moisture content, the bulk density, the particle shape, the percentage of halve size fractions and the percentage of under-size.

2. Media used to separate particles related factors

The size of openings, their shape, the material from which the sieve is made and the “open area” as percentage of the total deck area hugely influences both the capacity and efficiency of a sieve.

3. Factors relating to the machine used to separate particles

The machine type (shaking, gyrating or vibrating), the type of movement induced to the material, the speed of the induced movement, the direction of movement, the width/length of the deck and whether it is set at an inclination similarly affects the outcome hugely.

4. Type of Duty related factors

The cut-off point (size) for separation, the spread of particle size to be separated from the material, the desired level of accuracy, whether the process is dry or wet and the desired work rate (capacity) naturally affects the size and construction method of the screening machine to fit the purpose for which it must be designed and built.

Union Engineering prides itself on being at the forefront of applying the latest mathematical formulas and technologies to accommodate all these factors in the design – backed up by extensive testing programs – and manufacture of high frequency vibrating screens to separate size fractions typically in the ranges from 200 micron to 20 mm and vibrating screens to accommodate larger size fractions.


Working Principles of the Union High Frequency Vibration Screen