Vibratory Screeners vs Rotary Sifters

Darren Ralphs
Darren Ralphs
Marketing Assistant

Comparing traditional rotary sieves with modern vibratory screeners to determine which is the most efficient and hygienic solution

With an increase in regulations and quality standards, manufacturers are having to review their processes, and seek new ways to optimize production. This means a change of approach in the way a factory operates, from how people work or how stock and space are utilized, to the introduction of alternative technologies. These changes lead to improved product quality, efficiency of production, reduced costs and compliance with environmental standards.

Choosing the correct sieving or screening machine is fundamental in ensuring that the product is processed efficiently and to the highest possible quality. There are numerous technologies available, however rotary sifters have commonly been used to remove oversized contamination from good product, particularly for raw ingredients in the food industry. This is due to their effectiveness at de-agglomerating powders at a high capacity, as well as generally being easy to install. The Russell Compact Sieve®, however, has provided a number of other advantages, and this high-capacity vibratory screener is the most hygienic solution.

Contamination Control

Contamination control is the biggest issue when operating a rotary sieve. In particular, the method of forcing material through the screen in a rotary sifter can cause damage to the mesh, which can be overlooked as the machines are so difficult to disassemble and inspect. This, as well as the constant loss of good product through an oversize outlet, means having to reprocess material, an unnecessary cost and use of time.  Modern industrial screeners facilitate sieving through a vibratory motion, which is far less strenuous on the mesh, and any ferrous contamination that does enter the pan can be removed by the addition of a Russell Easy-Clean Magnetic Separator™.

Improved Usability

Vibratory Screener installed at Nestle Chile

Compared to the design of a rotary sieve, vibratory screeners are considerably more operator-friendly. With an innovative quick-release clamping system, no tools are required to disassemble, meaning that changing the screen or cleaning the machine is quick and safe, reducing downtime. Also, maintenance costs are reduced, with fewer wearing parts that would have to be replaced regularly. In addition, with its lower noise level (typically 70DBA) and enclosed sieving compartment, the benefits of this machine satisfy the requirements of quality and safety supervisors.

Sanitary Design

Vibratory screeners are designed to provide the most hygienic solution possible. With fewer contact parts, and a fully stainless-steel design, the machine is easy to clean and maintain, an important factor in industries such as pharmaceutical and food (see right, installed at a Nestlé plant in Chile). Rotary sieves can have many hidden areas and crevices that act as bug traps, and, being extremely difficult and time-consuming to take apart and clean, hygiene cannot be guaranteed.

High Capacity, Compact Design

An inline, compact design makes the vibratory screener half the height of a traditional sieving machine, fitting neatly into any part of the production line. Its compact design does not mean a sacrifice in production capacity, however, achieving higher throughput per unit mesh area than conventional screeners. In some cases, particularly when screening sticky powders, rotary sieves are prone to blinding. The Russell Compact Sieve® is better suited to these difficult powders, and with the optional upgrade of the Russell Vibrasonic® Deblinding System, enables even higher screening capacities, as well as accurate grading down to 20 micron. This ultrasonic screening technology prevents mesh blocking, and has revolutionized the way difficult powders are sieved.

A wide range of sizes and specifications means the Russell Compact Sieve® can be tailored to suit your exact needs, and is ideal for high capacity safety screening of powders and liquid slurries. For more information, contact us today.

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