Particle Size Classifier for the Subsieve Range

A particle size classifier for dry powders in aerosol form, based on the combined classifying mechanisms of impaction, adhesion, and the characteristic trajectories of particles, has been developed and extensively tested with a variety of powders. Continuous classification has been achieved for powders the diameters of which are predominantly below 50 μ by impacting the aerosol cloud onto a moving surface and recovering those fractions resulting from the aforementioned mechanisms. Partial separation of powder mixtures is sometimes possible when the components have widely differing physical properties.