Full-Screen Hammer Mill

Full-Screen Hammermill for High-Capacity Industrial Size Reduction

For manufacturers processing bulk materials at scale, achieving consistent particle size while maintaining high throughput is essential. The Prater Full-Screen Hammermill (G-Series) is engineered to deliver efficient particle size reduction by maximizing the usable screen area around the rotor. Its exclusive full-screen design allows 100% of the screen area to participate in grinding, improving productivity while maintaining uniform particle size distribution.

The mill operates using high-speed rotating hammers that impact raw material within a specialized grinding chamber. Material remains in the chamber until particles are small enough to pass through the sizing screen, ensuring consistent end-product quality.

With hammer tip speeds ranging from 14,000 to 21,000 feet per minute and configurations available for different screen sizes and hammer arrangements, the Full-Screen Hammermill is designed for continuous industrial operation. Its rugged construction, reversible rotors, and easy-access maintenance features make it well-suited for demanding particle reduction applications across industries, including food processing, chemicals, agriculture, and recycling.

FEATURES

• Full-width top feed utilizes 100% of the usable screen area
• Wider rotors accommodate a variety of hammer arrangements
• Electronically balanced, top feed, reversible rotors
• Fast wear parts change
• 60 & 50 cycle direct drive models
• Stainless steel construction (304 & 316 SS) available

BENEFITS

• Uniform granular grind and even hammer wear
• 24 hr/day operation rated
• Hammer tip speeds from 14,000 to 21,000 Ft/Minute
• Easy screen changes and full-access maintenance
• Increased throughput capacity without increased power requirements

Since 1925, Prater has utilized the most advanced technology and innovative solutions to create state-of-the-art Hammer Mill and size reduction products that are used around the world. Our exclusive G-Series, Full Screen, Hammer Mill is specifically designed for applications that require high capacities, power efficiency and uniform particle size. This provides our customers with confidence in knowing that we have the ideal machine for their unique particle reduction applications.

SCREEN SIZE AND PLACEMENT MATTERS

Our exclusive Full Screen design is a proven system that ensures use of the entire available screen area which enhances end product quality and hammer mill productivity. Hammer mill screens are strategically placed where extensive testing has shown the majority of milling and grinding takes place. This optimal placement increases throughput capacity without increasing power requirements and other costs. The design also simplifies screen changes by improving access to working parts.

LONG LIFE AND VERSATILE HAMMER DESIGN

The center feed and fully symmetrical rotors distribute the product across the full width of the screen area for even hammer wear. This allows the rotor to be reversed so that both edges of the hammers can be utilized before replacement is required. Correct clearance between hammers and screens is maintained by mounting all screens in heavy-duty frames. Rotors are wider for varied hammer arrangements, and are all supported between durable pillow block bearings. These proprietary design factors combine to provide a controlled, uniform granular grind with the benefits of easy maintenance.

FULL SCREEN HAMMER MILL SIZES AND CAPACITIES

Frequently Asked Questions

How does the “full-screen” design impact throughput and grind consistency?
A full-screen design increases the usable screen area around the rotor so more material can be processed at a given time, which can improve throughput while maintaining a consistent particle size distribution—especially when paired with the right screen and hammer configuration.

What variables control finished particle size on a Full-Screen Hammermill?
Final particle size is primarily governed by screen hole size, along with hammer tip speed, hammer pattern, and feed rate. Material properties (friability, moisture, fat/oil content) also influence how quickly particles pass through the screen.

How do I choose the right screen and hammer setup for my material?
Selection typically starts with the target PSD and throughput, then validates via testing or historical data for similar materials. Many applications dial in performance by adjusting screen area/opening, hammer configuration, and rotor speed to balance fines generation, heat, and capacity.

What wear points should operators monitor on a high-throughput hammermill?
Common wear components include hammers, screens, and internal wear liners (if used). Monitoring amp draw, vibration trends, and changes in grind consistency helps identify when hammers/screens are approaching end of life and prevents performance drift.

Can a Full-Screen Hammermill integrate with pneumatic conveying or dust collection systems?
Yes — Full-Screen Hammermills are commonly integrated into bulk solids systems with conveying and dust control. System design should account for air movement, product temperature, and collection/filtration so the mill maintains stable feed and discharge conditions.