High Performance Unavailable from Any Other Bulk Solids Mixer

MUNSON® Rotary Batch Mixers provide a superior combination of standard features that improve quality and cut cycle times while reducing maintenance and operating cost.

Cut cycle times.


1 to 3 Minute Mixing Times

A MUNSON Rotary Batch Mixer requires only 1 to 3 minutes to blend a batch, boosting output while eliminating or minimizing any effect on the integrity, temperature, moisture and density of your material. Short cycle times also allow smaller Rotary Batch Mixers to equal the production of larger, slower mixers, saving floor space.


Uniform Dry Blends

MUNSON Rotary Batch Mixers are efficient, distributing particles throughout the batch with uniformity to one-tenth of one percent typical — even when blending particles of widely disparate sizes, shapes and bulk densities — maintaining consistent product quality.


Gentle Mixing

The MUNSON Rotary Mixer folds, cuts and turns material as it tumbles, achieving batch uniformity gently as well as quickly — with no free-fall of material that can damage particles. Light and fluffy materials remain in that condition during mixing and upon discharge, with no densification. Similarly, materials that are dense under ideal circumstances remain dense during mixing and discharge — an added benefit when packaging blended material by weight or volume.

Total Discharge

In addition to blending, proprietary mixing flights also serve to move all material to and through the plug gate discharge valve until the vessel is empty, eliminating residual that would otherwise be wasted or require manual removal prior to cleaning.


Ultra-Fast Cleaning and Sanitizing

Sanitizing is fast and easy for several reasons exclusive to the MUNSON Rotary Batch Mixer:

  1. Complete discharge with only minimal residual dust on interior surfaces
  2. Unlike other rotary designs, no shaft seals and no dead spots or deep recesses to harbor contamination
  3. Multiple drum clean-out doors
  4. Unrestricted access for spraying with air, cleaning solutions or steam
  5. Available wash/rinse-in-place spray nozzles
  6. Convenient drain plug
  7. Cross ventilation of one large open area for rapid drying
  8. Ability to visually inspect all internal surfaces

Uniform Liquid Additions, Coatings, Flavorings, Impregnations

MUNSON offers all Rotary Batch Mixers with single or multiple internal spray lines for liquid coatings, flavorings and impregnations. Unlike mixers that spray liquid additions onto a thin waterfall of material (as well as through the material and onto inaccessible internal surfaces), MUNSON Rotary Batch Mixers spray liquid additions onto a wide expanse of moving material, rapidly achieving batch uniformity to one-tenth of one percent at ratios down to 1 part per million of liquid to solids.


Internal Spray Line

The internal spray line (left) is removable and accessible from outside of the machine. The internal vent (right) allows displaced air and dust to exit the mixing drum during filling.

Wide Range of Flexible Capacities

Useable capacities range from 5 to 600 cu ft (142 liters to 17 cu m), with equal mixing efficiency at 100% of rated capacity to as low as 15% (33% with liquid additions), providing unsurpassed flexibility.


No Segregation on Discharge

The constant motion of a Rotary Batch Mixer during loading, blending and discharging cuts cycle times significantly, and prevents the segregation of ingredients during discharge.


Rotary Batch Mixer Discharging

Rotary Batch Mixer of teas shown discharging one of 200 blends of tea with no cross-contamination.


Full Interior Access

Unlike competitive designs, the MUNSON Rotary Batch Mixer has no recesses, hidden chutes, scoops or buckets that make cleaning, inspection and maintenance difficult or impossible. Instead, it is equipped with large doors allowing unrestricted access to every surface of the unobstructed mixing vessel interior.


Large doors provide unrestricted access

Large doors provide unrestricted access to the wide-open vessel interior for cleaning and inspection.


Low Energy Costs

Due to the high efficiency of gently tumbling the entire batch, MUNSON Rotary Batch Mixers are extraordinarily energy efficient per amount of material mixed, reducing energy costs significantly. Compare the power requirement of a MUNSON Rotary Batch Mixer to that of any other mixer based on batch weight, batch volume and/or weight/volume of output per minute.

No Internal Shaft or Shaft Seals

The vessel of a MUNSON Rotary Batch Mixer is supported by two oversized trunnion rings that ride on heavy-duty alloy roller assemblies, providing superior load capacity and exceptional life. This arrangement also eliminates the need for an internal shaft with seals contacting material. To contain dust, the machine has only one seal at the inlet which is mounted externally, and is fast, easy and inexpensive to replace.


Dust-Tight Operation

The MUNSON Rotary Mixer is particularly suitable for enclosed, automated systems where dust-tight connections link it to other equipment. Equipped with a single radial seal that prevents dust leakage from the drum, it allows materials ranging from pharmaceuticals to toxic substances to be mixed safely, with no contamination of the material or of the plant environment.


No Reversing or Tilting for Loading, Discharging

Internal flights within the rotating vessel move the material toward and through the discharge gate (when open), eliminating the need to tilt the machine for emptying, while minimizing floor space. Stationary inlets and outlets also allow hard piping into upstream and downstream equipment, and permit the drum to rotate continuously during loading and discharge, cutting cycle times.


No Reversing or Tilting for Loading, Discharging


Long Life with Minimal Maintenance

With periodic monitoring and minimal maintenance, even minor downtime can be eliminated. Seals can be replaced in minutes — 10- to 20-times faster and more economically than with other rotary designs.



  • Uniform mixing in 1 to 3 minutes
  • Ultra-fast cleaning and sanitizing
  • Capacities from 5 to 600 cu ft (142 liters to 17 cu m)
  • Gentle tumbling action plus short cycles eliminate or minimize degradation
  • No stratification, segregation or densification
  • Equally efficient mixing from 100% down to 10% of rated capacity
  • Handles dry powder and granular products
  • Totally dust tight
  • Loads, mixes, unloads at the same floor level — no need for multi-level structures
  • Ideal for uniform liquid additions, coatings, flavorings and impregnations
  • Low horsepower, high mechanical efficiency
  • Exhaust vent for air and dust displaced during loading
  • Quick opening access door in the mixer drum section
  • Internal lifter and baffle design variations to meet the mixing requirements of unusually difficult and/or fibrous material
  • Rotating vessel supported by two oversized trunnion rings for superior load capacity and exceptional life
  • Completely self-emptying except for possible dust on interior drum surface
  • Completely welded frame and drum assemblies
  • No need to stop or reverse mixer for loading or discharging
  • Constant motion ensures uniform distribution of batch ingredients during loading and mixing as well as discharging
  • Manual or solenoid-operated discharge valve


  1. Plug gate discharge valve
  2. Trunnion ring
  3. Rotating mixing vessel
  1. Large access doors
  2. Trunnion ring
  1. Retractable intake chute
  2. Low power motor