Industrial Particle Size Reduction Equipment for Dry Bulk Material Processing

Improve Particle Size Consistency | Increase Throughput | Reduce Downtime

We help identify and implement the right Prater Industries solution for particle size reduction, grinding, milling, lump breaking, air classification, and material feeding applications. From food ingredients and chemicals to minerals, plastics, grains, agricultural products, and other dry bulk materials, Prater equipment helps manufacturers improve product consistency, production efficiency, and overall process performance.

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Hammer Mills • Fine Grinders • Air Classifying Mills • Lump Breakers • Rotary Airlocks • Rotary Valves • Particle Size Reduction • Dry Bulk Material Processing

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Prater Rotor Mills

Explore screenless milling for a specific material challenge.

Discuss My Application Product Brochure PDF Product Details

Explore screenless milling for a specific material challenge.

Does your product need a different approach to grinding or deagglomeration?

The Prater Rotormill uses a long-gap, screenless grinding arrangement with air turbulence and particle-to-particle interaction. Its suitability depends on the material and the processing result required.

Typical application
Assess a difficult milling or deagglomeration duty through an application review.

Also known as: Rotormill, long-gap mills, screenless rotor mills.

What this equipment can help you do

Screenless approach

Review an alternative grinding mechanism for the material.

Application flexibility

Discuss grinding, deagglomeration, or another clearly defined processing duty.

Result-led testing

Confirm the output against a representative sample and acceptance criteria.

How the process works

Introduce the feed

Feed material into the selected airflow arrangement.

Process in the mill

Rotor action and turbulence create particle interaction in the grinding zone.

Collect the output

Discharge processed material to the designed collection system.

See the equipment and process

Prater Rotormill equipment detail. Configuration is application dependent.

Materials, industries & equipment choices

Flour & food powders

Prater describes Rotormill use in fine flour milling. Confirm how the resulting distribution affects your next process.

Minerals & industrial processing

Diatomaceous earth is a described milling application. Abrasion, moisture, and the processing goal guide the internal configuration.

Configurations to compare

Vertical or horizontal arrangements, carbon or stainless construction, hardened internals, and application-specific airflow and grinding plates.

Prater application insight

Material application: finer flour

Prater discusses Rotormill processing for fine flour. Start with the incoming distribution and the flour characteristics your next operation needs, then assess a sample against those targets. The photograph illustrates the material application and is not a Prater installation or a guaranteed milling result.

Flour application photograph used in Prater’s fine-flour milling article.

Source: Prater Industries. Read Prater’s fine-flour milling article >>

Configuration & selection

Material behaviour: Feed distribution, moisture, fibre content, heat sensitivity, and abrasiveness.
Desired change: Define the grinding, deagglomeration, or other processing result.
System requirements: Capacity, airflow, collection, access, and available utilities.

Options to discuss

Vertical or horizontal arrangement
Hardened internals for abrasive material
Rotor and processing configuration
Feed and airflow control
Product collection arrangement
Construction and service access

Send a representative material description, feed and target particle-size distributions, required rate, and a process sketch. Include any cleaning or temperature limits.

Plan your application review

When should I consider a rotor mill instead of a hammer mill or ACM?

Use the material response and target result to make the comparison. Share a sample, current process, and acceptance criteria so RTS and Prater can assess the appropriate milling approach.

Can we review or test my material before selection?

Share the material, the current process, and measurable acceptance criteria. RTS can discuss the appropriate review and any testing requirements with Prater before a final recommendation.

What about dust collection and process integration?

Include the feeder, collection system, utilities, cleaning needs, and upstream and downstream equipment in the review. Final equipment and protection requirements depend on the complete application.