For over 85 years, Prater-Sterling has provided reliable particle processing solutions to businesses of all sizes. Our motto has always been "Results Come First," and for many decades we have proudly stood by that business approach. Our extensive array of equipment and systems serve your dry processing, powder and bulk solids applications easily and efficiently. We offer many expertly designed systems and lines of industrial processing equipment to ensure that you receive the best possible results of your process time and time again. Each high-quality product that we develop is intended to serve each industry differently and uniquely to provide the desired outcome of each processing application.

Air Classifiers: Opposing a particle’s aerodynamic drag force with centrifugal force, air classifies create narrower size distribution and finer separations that conventional screeners. All production models utilize an adjustable forced vortex to provide uniform results while adapting to a range of feed variations. Also includes the “Mini-Split” for laboratory scale or small, batch sized separations.

Classifier Mills: The classifier mill combines two-staged, closed circuit grinding with internal air classification for ultra-fine micronization. The distinctive capabilities of the classifier mill outperform single-stage mills when handling products that are difficult to grind or require ultra narrow particle distributions.

Compactors: Need to transform scrap into reusable product? Our compactors reduce waste and compact particles to reduce density and volume. Incorporate agglomeration, compaction, and briquetting machines into multiple equipment processing systems for increased handling efficiency and profitability.

Fine Grinders: Ideal for grinding dry, free-flowing or heat sensitive materials to 325 mesh. Precision tolerance between blades and screen frame results in narrow particle distributions. Cantilevered rotor, outboard mounted bearing spindle and large, glide hinged door improve reliability and reduce maintenance.

Hammermills: Full Screen Hammermill: Widely used for re-work, bakery finishing and other applications that require high capacity grinding to 35-mesh. Mega Mill: Rugged, dust tight design ideally suited for use within a pneumatic system.

Lump Breakers: Compact, economical easy to maintain machine that gently pulverizes agglomerated or densified material with lumps up to 8” in size. De-lumped material has improved flow characteristics and also benefits downstream blending and drying processes.

Rotary Airlocks: All of our airlocks come standard with 8-blade rotors and precision, temperature-compensated machining to minimize air loss under operating conditions. Oversized inlet throat and rotor pockets ensure maximum displacement for each model size. Optional features include air-purged seals, replaceable rotor tips and various wear coatings.

Rotary Sifters: High capacity sifting and scalping at rates many times greater than conventional sifters with similar screen area. Unique centrifugal force imparted by adjustable paddles, in combination with flexible mesh fabrics, greatly reduce binding problems when handling materials containing high fats/oils. Three bearing design ensures smooth, vibration-free operation and long life.

Vibrating Screens: These vibrating screens are Ideal for scalping, sizing and grading of materials into 2 to 4 fractions. Positive eccentric motion and tuned suspension base deliver more uniform distribution across the entire screen deck, resulting in higher capacities per applied screen area.