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Perfect dispersion is vital to many processes in order for optimum results to be achieved. We explain in detail the steps required and the equipment needed


POWDER DISPERSION


POWDERS ARE USED IN THE PRODUCTION OF MANY DIFFERENT PRODUCTS. WHETHER IN LACQUERS OR paints, sealing compounds, adhesives or construction chemicals, food and cosmetics – the production of all these products requires the addition of powders into liquids. To achieve best results, the powder has to be dispersed perfectly. The Conti-TDS from ystral inducts and disperses powders optimally. The main target in the processing of powder is its complete wetting, desagglomeration and homogeneous distribution in the liquid. The process starts with the transfer into the process tank, incorporation, wetting and dispersion and finally ends with the homogenous distribution in the liquid. Ystral TDS machines are designed to handle all five steps in one single machine. It streamlines the overall process and reduces production costs and time.


DUST-FREE HANDLING


Conventional powder addition from top into a process tank always creates dust. But TDS machines add the powder differently: they induct it with vacuum. The vacuum is created directly inside the liquid. This way the powder is incorporated dust free directly from the bag, hopper or container. It’s completely dust-free. No powder is poured. No bag has to be lifted. No dust sticks to the inner wall of the tank.


TDS machines are available in two basic versions: The TDS-Induction mixer is installed inside the tank. It mixes homogenously and inducts the powder sub surface. The Conti-TDS is installed in a loop outside the tank. Powder is inducted in line and powder and liquid enter via separate inlets. They get in contact while reaching the high shear dispersing zone. Dispersion is carried out under maximum vacuum and high shear With this method powder can be inducted easily into


flammable liquids as well. Using Conti-TDS the powder is inducted into the streaming liquid under vacuum. It does not get in contact with any inflammable vapour above the liquid.


WETTING AND DISPERSING Powder has a large, specific surface. The powder in a 25 kg bag may have a surface of 100.000 m² to more than a square kilometre, depending on particle size and structure. This has to be completely wetted with liquid. When powder is poured into the tank from above, it is added to a liquid surface of not more than a few square meters. The extreme mismatch of surface sizes causes the formation of agglomerates. Those have to be destroyed again. This takes time, energy and often destroys shear sensitive ingredients. The Conti-TDS works in a completely different way: The vacuum has the effect of expanding the air between


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