Comparing 3 Types of Screening Equipment

When it comes to screening for particle separation, there are many options out there to choose from. Your equipment choice can have a direct impact on operating costs, efficiency, and more. 

Here are three of the most common types of screening equipment.

Trommel Screens

Consisting of a rotating cylindrical drum with perforations in it, the trommel screen is well known, and commonly used in the industry. The drum is usually angled to promote material flow but is only able to provide 1/3 of the screen area.

Undersized material slips through the perforation cavities while oversized material continues through the trommel and onto the next stage of the process, which may include looping back to a shredder for further reduction.

Trommels have a relatively low investment cost, but typically require a large footprint and have inherent issues with material binding to the screen perforations. Brushes can be used to combat blinding, but their wear rates are high.

Vibrating Screens

Vibrating screens are an important part of material screening, consisting of an inclined vibrating plane that is energized by an electromagnetic vibrator or a form of off-balance drive system. These types of screens are often utilized in mineral applications where feed streams need to be separated at ½” or smaller, down to a couple of hundred microns.

These screens play a large role in material processing, but depending on the screen design and type of material being processed, they can blind over causing other processing headaches.

The Bivitec vibratory screen can handle a variety of difficult materials.

Disc Screens

Disc screens are also widely known in the industry, consisting of rotating shafts that intermesh with each other, and are spaced to separate material into two fractions. The Freedom Disc Screen functions in a similar manner but has an innovative advantage over the other disc screens: its anti-clogging system.

The Freedom Disc Screen design involves the isolation of the machine shafts from the material combined with the liberation of the material through the octagonal faceted HARDOX discs. This innovation resists the wrapping of long, stringy materials that can stop a recycling process dead in its tracks.

This small footprint, high capacity screen allows for high material agitation as the incoming feed passes across the machine. This additional energy shakes enough unneeded fines from the feed stream to produce additional savings in transportation and tipping fees.

For more information about The Freedom Disc Screen, its capabilities, and how it can better serve your screening needs, request a quote today.

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