Diamondback blenders

Tumble blender

Diamondback Technology's tumble blender, with its one-dimensional convergence, uses the same award-winning technology featured in the Diamondback Hopper to optimize blender performance.

The blender's motion twists and turns solids in multiple directions, creating criss-cross flow action that eliminates dead regions while providing excellent cross-flow. It achieves rapid bulk solids mixing, usually in less than 30 revolutions, with a variety of solids, including cohesive materials that cause hangups in other blenders.

The blender's variable dynamics mix many combinations not suited for mechanically agitated blenders either because of demixing tendencies or particle size degradation.

The Diamondback Hopper portion also detaches to provide an anti-segregation container for feeding the next process. By prefilling the next batch into a spare hopper that then connects to the blender, it's possible to achieve three- to 10-minute total batch time.

Typical applications
  • Extruder premixing
  • Tableting press feed
  • Batch compounding
  • Minor ingredient premixing
  • Hangup-free anti-segregation bottom-to-top discharge
  • Optional, easily changed spare hoppers
  • Sizes ranging from 0.4 liters to 150-cubic-foot capacity
  • Optional intensifier bar available (usually not necessary)
  • Simple construction (no mechanical agitators) to minimize maintenance

Dynamics of the Diamondback Tumble Blender

The Diamondback Tumble Blender's unique diamond shape creates a complex velocity gradient that moves particles rapidly in the center and allows material particles to slide down their repose angle to the bottom of the blender where they discharge without hangups. Sudden changes in velocity as particles cascade and careen into the multi-directional sides promotes rapid mixing at both high and low rotational speeds.

Tests on sand and corn grits or salt and beans that demix at low speeds showed excellent mixing at higher speeds. Tests with pellets and easily fluidizable resin powder mixed best at low speeds. Even a very cohesive mixture of 10% brown sugar and friable potato flakes mixed very well. The blender reduced brown sugar lumps to small flake-size pieces even without the optional intensifier bar. The anti-bridging outlet provides hang-up free mixture discharge.

In-bin blender

The Diamondback In-bin Blender uses proven one-dimensional convergence technology to create adjustable flow patterns that optimize in-bin blending action. Adjusting a single interior cylinder provides superior blending for large quantities of solids ranging from plastic pellets to coal. In-line blenders are custom designed for the material and application.

Typical applications
  • Converting existing bins from storage to active blending
  • Smoothing cyclical variations over as much as two times the bin volume
  • Blending out-of-spec material and eliminating waste
  • Blending cohesive, free-flowing and combination solids without hangups
  • Remixing segregated solids from pneumatic conveyor transfer
  • Blending multiple density powders that segregate in other blenders
  • No moving parts
  • Self-cleaning
  • Adjustable blender profile for optimum blender performance
  • Optional intensifier bar available (usually not necessary)
  • Stainless steel construction for consistently good results
  • Optional cost-saving epoxy-coated carbon steel
  • Easily converted to anti-segregation first-in first-out flow

Dynamics of the Diamondback in-bin blender

The concept of differential retention time is essential for good blending. As shown in the transparent demonstration model in the photo (above), the dark topmost layer in the blender partially exits, while the sides of this same layer hold back to exit later. This differential retention time promotes continuous blending of the dark top layer with the rest of the blender's material as the contents exit. Even the dark layer's remnants along the blender's walls show a retention time differential with respect to each other.

Adjusting the interior cylinder's vertical position adjusts the differential retention time from zero to two times the bin's volume. This means the blender adapts to almost any application. For example, a glass batch loaded in 10 discrete layers by a pneumatic conveyor often exhibits top-to-bottom segregation within the layers, leaving large heavy components on the bottom and light fluffy components on top. At the same time, the bin often exhibits center-to-side segregation throughout the bin. The Diamondback In-bin Blender set at a 0.15 to 0.2 differential retention time will remix the segregated layers and sides as they exit. This same adjustable blender is also capable of a 2.0 differential required to blend a small off-specification quantity of material into a high-grade material.

Contact us at

Diamondback Technology, Inc.
3851 McKay Drive
Langley, WA 98260
(360) 303-7763


Our tumble and in-bin blenders achieve the hallmarks of effective blending: They promote different flow velocities, prevent stagnant regions and do not segregate or demix the ingredients. They are also effective for cohesive and friable materials not suitable for many other blender types.

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