Mk VII-1 Rollo-Mixer® Rotary Drum Mixer

The Mk VII-1 is a versatile rotary drum mixer designed for uniform mixing, blending and coating of powders, pellets and granules having a wide variance in particle size and density in minutes. The very capable Mk VII-1 delivers a cascading curtain of free-falling material for coating with various liquids. An enclosed turbine section and proprietary updated internal design allows the Mk VII-1 to take on a wide variety of blending and coating applications. Advanced cleanout and control options are continuously enhanced.

The Mk VII-1 design is ideal for: agricultural chemicals, animal health products, fertilizers, livestock premixes, gourmet tea, kitty litter, laundry fragrances, thermoplastic elastomers, coating polymer powders, flavoring & casing tobacco, rodenticides, herbicides and much more.


The Mk VII-1 can be loaded by gravity through hoppers connected to load in chutes chutes above and on the side of the mixer.  Multiple ingredients can be loaded while the machine is at rest or in motion.  The Rollo-Mixer is full at shaft center.  Mk VII-1 Rollo-Mixers can accommodate multiple methods of loading by gravity from: Silos, Super saks, Gaylord bags, pneumatically, from elevator legs, bags and boxes.


Material from the free-falling curtain is diverted by gravity out the discharge chute in a steady, unimpeded, uniform stream — differentiating Rollo-Mixers from other industrial drum mixers. Depending on the speed and size of the mixer, product can be discharged up to 2 tons per minute. Product blends throughout the discharge. The Mk VII-1 continues running until product discharge is complete.

Additional Information

Materials of Construction Finishes Available
(material contact points)

  • Carbon Steel – High Release Finish
  • 304 L Stainless Steel
  • 80 or 150 grit Polished finish
  • Abrasion Resistant Plate

Safety & Maintenance

  • State of the art safety switches
  • Painted Carbon or Stainless Steel Guarding
  • Accessible Zirk fittings
  • Automatic chain oiler


  • CE
  • CSA
  • NEMA 12,
  • NEMA 4x
  • Class II, Div. 1 & 2

Mk VII-1 Series & Sizes

Available in 51 sizes from 3.5 to 1,286 cu ft.  Contact us for dimensional specifications.

View All Load Volumes

  • 28 Series (3.5 ft³, 5 ft)
  • 31 Series (10 ft³, 15 ft³)
  • 50 Series (25 ft³ – 40 ft³)
  • 62 Series (40 ft³ – 83 ft³)
  • 74 Series (75 ft³ – 172 ft³)
  • 86 Series (133 ft³ – 267 ft³)
  • 98 Series (200 ft³ – 400 ft³)
  • 101 Series (343 ft³ – 629 ft³)
  • 120 Series (533 ft³ – 1000 ft³)
  • 132 Series (833 ft³ – 1286 ft³)

Load Volume Calculator

Batch Size (lbs/batch) ÷
Product Density (lbs/cu ft) =
Load Volumne (cu ft)
Batch Size (kg/batch) ÷
Product Density (kg/cu ft) =
Load Volumne (cu ft)
Determine which Rollo-Mixer® best fits your needs: View Product Specs

Test Your Product

Come to our test facility in Wisconsin to run trials with the 5 or 10 cu ft Mk VII-1 Rollo-Mixers®. Watch your products be blended, heated, cooled, du-dusted, encapsulated and much more. The Mk VII-1 features excellent liquids to bulk solids integration through “Free-Fall Processing”®

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Contact Us Directly

Call us now to discuss your application. We have worked directly with our customers for over 50 years, and are happy to lend our trusted knowledge to your application. We’re here to help you directly from your initial interest, and testing…. to start up and for the lifespan of your Rollo-Mixer®

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