Aluminum fine particles made by atomization range from a few μm to 100 μm in sizes. Aluminum powders in the metallic paints are generally manufactured by classifying the atomized particles. The classified fines are flattened by a wet ball mill to produce a flaky product of 10 μm diameter with 0.5 μm thickness. The flakes in the paint are arranged on the paint film (leafing), which functions to prevent intrusion of moisture and corrosive substances across the film and ensure a uniform shine over the surface. To reduce diffuse reflection and ensure a high shine, the flakes arerequired to have a uniform particle size distribution. Therefore, the classifying process is very important to unify the size of the aluminum fine particles. For the removal of fines and coarse particles, the use of air classifier is common. However, when the classifier wheel size becomes large, the available cut point becomes coarser due to structural reasons and the fines yield is reduced. When very fine particle sizes are required, it is difficult to adopt large-sized classifier models.

Our multi-wheel Turboplex solves this problem by providing multiple small wheels in one classifier. This type of Turboplex enables the classification of aluminum fine powders at a large capacity. Therefore, it is adopted in the aluminum pasting process worldwide.