Keywords: Tumble Mixer, Tumble Blender, Drum Mixer, Drum Blender
Rotary Batch Mixers
Blend dry bulk solids with or without liquid additions quickly, uniformly, and gently, achieving total discharge and zero cross-contamination.
The Rotary Batch Mixer (also known in the industry as a Tumble Mixer, Tumble Blender, Drum Mixer, or Drum Blender) is a highly advanced mixing solution engineered to deliver flawless uniformity in exceptionally short cycle times. Capable of producing homogeneous blends in under 3 minutes, this mixer offers the lowest energy consumption in its class, complete discharge without segregation, and an extraordinarily gentle tumbling action. Its highly accessible, seal-free interior ensures that it can be cleaned and sanitized rapidly, preventing any risk of cross-contamination.
Proprietary 4-Way Mixing Action & Supreme Uniformity
At the core of the Rotary Batch Mixer is a unique, four-way mixing action that simultaneously folds, tumbles, cuts, and turns the material. As the drum rotates, proprietary internal mixing flights create a dynamic flow pattern that provides free space between particles, causing them to recombine up to 288 times per minute.
Because there is no forced agitation or free-fall of materials, the mixing process is incredibly gentle. Light, fluffy materials are blended without densification, and dense, fragile materials are mixed without degradation. Despite this gentle handling, the mixer distributes particles with astonishing precision, achieving batch uniformity to one-tenth of one percent (0.1%), even when blending ingredients of widely disparate sizes, shapes, and bulk densities.
Precision Liquid Additions and Coatings
The continuous, dynamic flow pattern creates an ideal “fluid bed” condition for introducing liquid additions, flavorings, colors, and impregnations. Unlike conventional mixers that spray liquids onto a narrow “waterfall” of material, Rotary Batch Mixers spray liquids onto a wide, deep bed of continuously moving material. This ensures every particle is uniformly coated, rapidly achieving distribution ratios down to 1 part per million of liquid to solids.
Unmatched Purity, Total Discharge, and Fast Cleaning
Unlike stationary mixers that rely on internal agitators, the Rotary Batch Mixer completely eliminates internal shafts and shaft seals that contact the material. The rotating vessel is supported entirely by oversized external trunnion rings riding on heavy-duty alloy roller assemblies.
This seal-free interior is paired with an exclusive plug gate discharge valve. When opened, the valve plug pivots inward, and the internal mixing flights continuously direct material through the opening until the vessel is 100% empty, effectively eliminating residual waste. Because the drum rotates continuously during loading, mixing, and discharging, it totally prevents material segregation and stratification upon discharge.
Cleaning is ultra-fast thanks to:
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Unrestricted Interior Access: Large, safety-interlocked access doors allow complete visibility and reach to all internal surfaces.
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No Dead Spots: There are no hidden chutes, recesses, or internal bearings to harbor contamination.
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Automated Sanitizing Options: Available with Clean-In-Place (CIP) multi-directional spray nozzles and convenient drain plugs for rapid wash-down and cross-ventilation drying.
High Flexibility for Any Industry
With capacities ranging from 5 to 600 cubic feet (142 liters to 17 cubic meters), this mixer provides unsurpassed processing flexibility. A single machine provides equal mixing efficiency whether filled at 100% of its rated capacity or operating as low as 5% (or 33% when making liquid additions).
The stationary inlet and outlet chutes allow for seamless hard-piping into automated, dust-tight systems, meaning the machine loads, mixes, and discharges on the same floor level without needing multi-level structures or tilting mechanisms.
Available Configurations & Options:
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Sanitary Models: Built to stringent USDA, FDA, and pharmaceutical standards. These feature #304 or #316 stainless steel product contact surfaces, continuously welded flights, and internal welds radiused to 0.25 inches and polished up to 240 grit to prevent material entrapment.
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Industrial & Abrasion-Resistant Models: Heavy-duty models are constructed with abrasion-resistant steel and replaceable wear plates. They are engineered to handle extremely heavy, poor-flowing materials like concrete premix, ceramics, glass cullet, and metal powders with bulk densities exceeding 200 lbs/cu ft.
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Heating & Cooling: Mixing drums can be equipped with low-pressure or ASME-coded high-pressure jackets to handle steam, hot oil, or refrigerants for precise temperature control during exothermic/endothermic reactions.
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Intensifier Bars: For non-free-flowing materials or soft agglomerates, an optional internal intensifier bar can be installed to impart necessary shear and promote rapid dispersion.
Key Benefits Summary
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1 to 3 minute cycle times
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Uniform dry blends and liquid additions (down to 0.1% uniformity)
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Gentle mixing with no particle degradation or densification
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Total discharge with zero segregation
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Ultra-fast cleaning and full interior access
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Lowest energy costs per volume of material mixed
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Stationary inlet and outlet for automated, dust-tight operation
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Operates efficiently from 5% to 100% capacity
For small production, laboratory, or pilot plant applications, Rotary Batch Mini Mixers are also available with capacities ranging from 0.25 to 15 cubic feet (7 to 425 liters).
