Molino rotatorio

Rotormills are referred to as “long-gap mills” because of the long annular gap between the inlet and discharge sites on the mill. Long-gap mills provide enhanced milling characteristics when particle-to-particle collisions are occurring during material processing.

molino de rotor In 1984, IPEC began manufacturing Rotormill, and in 2021 Prater Industries acquired IPEC and its quality product lines. The acquisition enabled Prater to build on IPEC’s legacy of outstanding machines and to reach a broader spectrum of industries.

Our Rotormills are known as “long-gap” mills because of the long annular gap between the mill’s inlet and discharge. Long-gap mills provide enhanced milling characteristics during material processing.

They are used in a broad spectrum of industrial applications. These industries include agriculture, chemical, pharmaceutical, energy, metallurgy, food processing, geotechnical, and waste management.

  • Eight models are available, ranging from 15 to 750 horsepower
  • Long gap design eliminates the need for screens that can choke or wear
  • Compact, heavy-duty construction with carbon or stainless steel fabrication
  • No specialized foundation is needed
  • Heavy-duty, top and bottom rotor bearings
  • Dynamically balanced rotor
  • Large access doors to the mill interior
  • Hassle-free adjustment or replacement of internal parts
  • Hardened grinder internals available for abrasive materials

Rotormill provides outstanding capability and benefits. These include:

  • Reduced cost and time of processing because several operations, such as de-agglomeration and surface coating, take place simultaneously
  • It can be used with materials, such as abrasive products and less-friable materials, which may not be handled well by a fine grinder or classifying mill
  • Continuous fine milling at high production rates
  • Simultaneous coating and mixing during milling
  • Fiber fluffing capability
  • Usable with a wide variety of material types

Particles are pulverized to small sizes by inter-particle collisions induced by very high turbulence within the mill. The pulverizing action is generated by an internal rotor that spins at high speeds. Heavy-duty bearings provide stability during the pulverization process. These bearings are housed outside the grinding chamber to prevent product contamination.

The rotor consists of two sections:

  • A Lower Section that functions as a material distribution fan
  • An Upper Section, where the material is finely ground.

Grinding occurs at several stages within the upper section. A series of grinding plates accelerate the air and particles against the grooved lining on the interior of the Rotormill. Miniature pockets of highly rotating air are set up within the mill during operation. This high-velocity turbulence causes particle-to-particle collisions and pulverizes the material. Internal heat is absorbed by the continuous flow of air.

Because of the unique design, which allows for varying airflows, the adjusting of the grinding plates, and the type of grinding plates, a wide variety of materials and sizes can be accommodated and rapidly processed. Heat-sensitive materials can be milled without cryogenic processing.

Eight IPEC Rotormill models are available, ranging from 30 to 750 horsepower. These include:

  • Model 1300: Our smallest unit: 30 HP, 500 CFM, two-stage rotor. Approximately 45” tall and 900 lbs. Ideal for small-batch or low-throughput processing. Includes a stand with casters for added mobility and access to the drive components.
  • Model 3000-4: Considered our “base” model. 50 to 200HP, 2300 CFM, four-stage rotor. Approximately 68” tall and 5,500 lbs.
  • Model 4500: The “mid-size” model. Strikes a good balance between size and price. 150 to 300 HP, 6500 CFM, five-stage rotor. Approximately 93” tall and 16,500 lbs.
  • Model 6000: Created for customers who can accept lower process volume to save on price. 300 to 400 HP, 11000 CFM, six-stage rotor. Specifications: Approximately 105” tall and 20,000 lbs.
  • Model 7000: The “high-end” model. Manufactures for processes that require high throughput. 300 to 500HP, 13000 CFM, six-stage rotor. Approximately 115” tall and 40,000 lbs.
  • Model 9500: The largest unit we offer. For customers who want the best-quality, heavy-duty material processing. 500 to 750HP, 20,000 CFM, six-stage rotor. Specifications: Approximately 130” tall and 55,000 lbs.

Vertical Models

  • Built-in fan
  • No foundation required
  • Adjustable air intake port
  • Compact heavy-duty construction
  • Heavy-duty top and bottom bearings
  • Rotor assembly dynamically balanced for smoother operation
  • Large double doors provide easy access to the interior
  • Easy replacement or adjustment of internal parts
  • Available with a variable speed classifier

Horizontal Models

  • Built-in fan
  • No foundation required
  • Adjustable air intake port
  • Compact heavy-duty construction
  • Heavy-duty top and bottom bearings
  • Rotor assembly dynamically balanced for smoother operation
  • Easy replacement or adjustment of internal parts
  • Heavy dense materials
  • High-temperature applications
  • Large capacity units

Let us know how we can serve you. We can custom-build almost any milling product needed for your application. If you require anything specific in a Rotormill, we will design and manufacture what you require. Similarly, if you already own a Prater Rotormill that needs maintenance or upgrading, contact us for immediate service.

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