Introducing Liquids to a Powder Mixture
"A piece of cake"
Mixing powders is far more complex than mixing gases or liquids due to their unique properties, such as their tendency to be cohesive, free-flowing, or prone to agglomeration. Introducing liquids into powder mixtures adds another layer of difficulty. Selecting the appropriate mixing technology is crucial, depending on the powder's properties and the desired characteristics of the final product.Because of these phenomena powder mixtures can be rather complex. Mixing processes where liquids need to be introduced into a powder batch are even more complicated.
One advanced solution to these challenges is the Vitomix, a mid-shear mixer developed by Hosokawa Micron. It offers a flexible approach to mixing, capable of performing both gentle, low-shear mixing and more intensive mid-shear mixing, significantly reducing mixing time. Its innovative design makes adding liquids to powders a "piece of cake."
Seamless Liquid Addition
A key advantage of the Vitomix is its versatility. In industrial processes, different types of mixers are often required depending on the properties of the materials and the desired outcome. After introducing a liquid with mid-shear mixing, a secondary low-shear mixing process may be needed for fragile materials. The Vitomix can perform both functions, enabling the gentle mixing of delicate components without compromising product structure.
The Vitomix builds on the principles of the Nauta® mixer but employs a different screw configuration and higher rotational speeds. This setup creates a fluidized bed at the top of the mixer, where liquids can be introduced seamlessly. The result is a perfect balance between liquid, powder, and air, producing a homogenous mixture without lumps, even when high percentages of liquids, fats, or oils are added.
For example, tests involving the injection of sunflower oil (up to 20% w/w) into bakery flour and the injection of melted butter (over 30% w/w) into a flour and egg powder mixture resulted in a smooth, lump-free mixture with no sign of dough formation. The timed trials demonstrated that the fluids were fully incorporated into the mixture after only eight minutes.
Efficient and Compact Design
The Vitomix's compact, partially conical design – unlike the fully conical Nauta mixer – allows it to handle the same mixing volume while its high-speed, large-diameter double ribbon screws ensure a faster and more efficient mixing process, even at low linear speeds. Without using lump breakers, delicate materials remain intact, making the Vitomix an ideal choice for liquid injection into powder mixtures.
The Vitomix stands out for its energy efficiency. Its ability to produce liquid/powder mixtures without lump breakers and its rapid mixing times make it far more efficient than other equipment. Additionally, the compact design of the Vitomix allows it to be used in environments with restricted structural height, without sacrificing mixing volume. Available in eight standard sizes, ranging from 500 to 13,000 litres, the Vitomix is suitable for a wide range of applications and throughput capacities.
Lump-Free Paste Production
The Vitomix excels in applications requiring paste production or the homogenization of both cohesive and non-cohesive powders. It is also well-suited for sensitive products like brittle granules or freeze-dried materials. The Vitomix has successfully handled notoriously difficult tasks, such as mixing water with guar gum and Na-CMC, without forming lumps.
Conclusion
The Vitomix offers a unique combination of mid and low-shear mixing capabilities, enabling the efficient introduction of liquids into powders without forming lumps. Its compact design, energy efficiency, and versatility make it a valuable tool for various industrial mixing applications, ensuring high-quality outcomes without compromising product integrity. With the Vitomix, achieving perfect liquid-powder mixtures is truly "a piece of cake!"
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Sustainable Process Technologies
Hosokawa Micron develops powder processing systems with a focus on energy efficiency, process optimisation and long-term operational performance. As an ISO 14001 certified company with an EcoVadis Silver Medal, we support more sustainable powder and bulk solids processing.
