Impact mill TDG

double

The TDG product line is a technically enhanced variant of the fluidised bed opposed jet mill with new double flooded classifying wheel, based on Vorced Fortex Technology. This results in highest fineness values or a throughput increase at identical fineness and higher air flow rate. At the same time, a reduction in energy consumption is achieved. In the case of jet milling, one takes advantage of the fact that as compressed gas exits a nozzle, it is accelerated to extremely high speeds. In expanding, the energy contained in the compressed gas in the form of heat is converted to kinetic energy. The speed of sound is initially a natural limit for the exit velocity. But by using Laval nozzles, the exit velocity can be increased to above the speed of sound. Laval nozzles are characterized by their hourglass shape, which widens downstream of the narrowest cross-sectional point, the nozzle throat. The length of the divergent part of the nozzle is adapted to suit the operating pressure. Compressed air of 20° C and 6 bar overpressure is frequently used. If the product to be micronized allows it, the use of hot gas up to 200° C can significantly increase the throughput and reduce the specific grinding energy. Comminution is a result of interparticle collision in the jets of air and especially also in the core point area, i.e. the point where the opposing jets intersect. Jet mills are impact mills which are used to achieve maximum fineness values. Such particle sizes can only be obtained in connection with an air classifying step.