Centrifugal Rotary Sifter for High-Capacity Powder Screening
Bulk material processing operations often require efficient screening equipment capable of separating particles while maintaining high throughput. The Prater Centrifugal Sifter (Rota-Sieve®) is designed to deliver high-capacity scalping, classification, and foreign material removal across a wide range of powders, granules, and agglomerated materials.
The system uses centrifugal force generated by a rotating multi-paddle rotor to accelerate material against a cylindrical screen. Finer particles pass through the screen surface while oversized particles move to a separate discharge outlet, allowing the equipment to efficiently separate products and contaminants during processing.
Prater centrifugal sifters can process materials ranging from ¼-inch particles down to approximately 325-mesh, making them suitable for applications requiring both coarse scalping and fine screening. The equipment is fully enclosed, minimizing dust and noise while maintaining stable, vibration-free operation within bulk solids handling systems.
With features such as adjustable paddle rotors, three-bearing shaft support, and quick-removal rotor assemblies, the centrifugal sifter offers a durable and easily maintained solution for industries that require reliable particle separation and contaminant removal.
The combination of high centrifugal force and blade spreading action reduces binding problems, even when handling materials that tend to flake or agglomerate due to fat or moisture content.
Prater Rota-Sieves® are ideal for removing foreign material (i.e. insects, plastic, string), sifting, scalping, and classifying.
KEY FEATURES AND BENEFITS
Scalps product from 1/4 inch – 325 mesh
Ultra high throughput per square foot of cloth area
Three-bearing shaft support, drilled for air purge
Optional quick clean designs with tool-less removal of internal parts
Optional sanitary finishes and construction
Options for compliance with USDA, FDA, BISSC, 3-A, and other U.S. and European regulators
Frequently Asked Questions
How does a centrifugal rotary sifter separate particles? A centrifugal sifter uses a rotating paddle rotor to accelerate particles toward a cylindrical screen. Fine particles pass through the mesh openings while oversized particles are carried to a separate outlet for discharge.
What particle size range can a centrifugal sifter screen? Centrifugal sifters can process materials ranging from approximately ¼-inch particles down to 325-mesh, depending on the screen fabric and process requirements.
Why are centrifugal sifters effective for materials that tend to agglomerate? The combination of centrifugal force and rotor paddle spreading action helps break apart lightly agglomerated material while pushing particles across the screen surface, reducing binding problems that can occur with sticky or fatty powders.
Where are centrifugal sifters typically installed in a processing system? Centrifugal sifters are commonly installed after material storage silos, before mixing operations, or ahead of final packaging to remove foreign material and ensure consistent particle size distribution.
Can centrifugal sifters operate within pneumatic conveying systems? Yes. Rotary sifters can be configured as inline or blow-through sifters, allowing them to integrate directly into pneumatic conveying systems while maintaining efficient screening performance.
