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Powtech World Magazine Advertorial


the powder particles and separating them on their way into the dispersing zone. The turbulence in the high shear zone actually increases the liquid surface a million times. Because of this, every single particle is wetted completely without agglomeration. In normal scenarios, the dispersion process is already finished after induction.


NOT ONLY FOR POWDERS The same process can be used for the dispersion of liquids into liquids. This is especially interesting when they involve oil/water emulsions and liquids which have totally different viscosities. In the production of adhesives, coatings and antiperspirants, for example, high-viscous thickener concentrates have to be mixed into a low viscous basic liquid. In a normal agitated tank, the gel swims on top or sticks to the wall. Using the Conti-TDS, the high viscous gel is dispersed into the liquid inline, which means that when it finally reaches the process tank it is already homogeneously dispersed. The opposite problem is experienced when it comes to mixing low viscous additives into very high viscous dispersions or pastes. The low viscous components tend to remain on the surface of the high viscous material. Here, as well, the Conti-TDS immediately provides a homogeneous dispersion in the external recirculation loop.


RHEOLOGICAL ADDITIVES


The dispersion of rheological additive powders is most difficult. These thickeners or stabilizers are used to create a specific flow behaviour and texture in the final product. They prevent the product from separating and the dispersed ingredients from sedimenting or floating. They come as a powder and have to be dispersed into a liquid to create the required rheology. To achieve maximum effect, they require a colloidal dispersion. Because of their strong thickening effect, they are used in low concentrations only and tend to form lumps and agglomerates. In conventional powder addition, it has to be further dispersed until all lumps are destroyed. But the product develops shear-sensitive polymer structures and form gels. Any further shear destroys the gel structure and reduces the thickening effect. Already hydrated gel is damaged. More powder has to be added to maintain the thickening. But the Conti-TDS machine with its vacuum technology wets and disperses every particle. Agglomerates do not occur. Further dispersion when the gel gets shear sensitive is not required. Conti-TDS machines are available in different sizes, with a power spectrum ranging from 3 to almost 300 kW. Depending on the application, they can be equipped with a variety of powder inlets and tools. Optimum equipment for powder handling and dosing comes with the system.


COMPANY INFORMATION


ystral is a fast-growing, owner-managed family company active in mechanical and industrial engineering, which achieves with its around 270 employees a revenue of 42 million euros. The company from Ballrechten-Dottingen, near Freiburg in Germany, projects, designs and manufactures clever mixing, dispersing and powder wetting machines and process systems. ystral.com


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