Hammermills

Prater hammer mills are the premier choice for applications requiring high capacities, operational efficiency, and uniform particle size distributions. All five Prater Full-Screen hammer mills are equipped with our proprietary Full-Screen design that enhances end-product quality while simultaneously extending unit lifespan. Major applications include:

• Conditioning of agglomerated blends
• Granulating of almost any material
• Recycling operations
• Reworking of off-spec products

These hammer mills are ideal for a variety of products, including:

• Agricultural products
• Biomass materials
• Ceramics
• Cereals
• Chemicals
• Food processing ingredients
• Hemp
• Minerals
• Pigments
• Pulp and paper
• Wood

Important features of Prater Full-Screen Hammer Mills include:

• Durable, heavy-duty fabrication designed for superior operation and long lifespan
• 100% of screen utilized for maximum efficiency
• A variety of hammer sizes, patterns, and screen openings available to tailor parameters for each application
• Balanced HP to screen area for maximum power efficiency
• Symmetrical, precision balanced, and reversible rotors
• Durable pillow-block bearings enhance unit lifespan
• Rigid-frame screen mounting for uniform hammer-to-screen clearance
• Unique frame track designed for easy screen removal and interchange without tools
• Large access doors make cleaning and maintenance simple and quick
• Stainless steel and sanitary design available
• Optional wear liners and wear-resistant hammers for abrasive products

The Prater Full-Screen Hammermill utilizes a specially shaped grinding chamber designed with distinct grind-and-release zones. Coarse raw product is fed into the chamber, using a rotary feeder or screw, by way of a product inlet at the top of the unit. High-speed hammers impact coarse material against stationary cutting plates fixed to the top of the pre-grind chamber. Impact with the cutting plates decreases the velocity of the material and guides it into the hammer path for maximum impact speed differential. Screen-to-hammer clearance is minimized at the 3 o’clock and 9 o’clock positions to amplify impact. As material moves toward the bottom of the chamber, hammer-to-screen clearance increases toward the 6 o’clock position to help with deceleration and egress of fully conditioned particles through the sizing screen. An adjustable diverter system prevents unfinished product from re-entering the inlet and product feed stream. Finished product is discharged via a hopper below the mill where a mechanical conveyor or pneumatic system can be utilized to remove the ground material.  Prater provides a full inventory of hammers, screens, and other grinding elements that are available to satisfy almost any grinding application.

The accompanying schematic illustrates how Prater Full-Screen Hammer Mills, which can be operated as a stand alone, gravity application or pneumatic circuit, can be integrated into your total operating system:

Prater stands ready to serve your needs. If your application requires a custom build, our staff will tailor a solution. Similarly, if you already own a Prater mill that requires parts, service or an upgrade, please contact us for a free consultation.