The vertical throwing motion is overlaid with a slight circular motion which results in distribution of the sample amount over the whole sieving surface. The particles are accelerated in the vertical direction (are thrown upwards). In the air they carry out free rotations and interact with the openings in the mesh of the sieve when they fall back. If the particles are smaller than the openings, they pass through the sieve. If they are larger, they are thrown upwards again. The rotating motion while suspended increases the probability that the particles present a different orientation to the mesh when they fall back again, and thus might eventually pass through the mesh.
An ideal equipment for normal day to day laboratory purpose, suitable for 8" Test Sieve (Soundless , Vibration type). Fitted with F.H.P Electric Motor. It can accommodate 6 Test sieves of 8" Dia with Lid and pan. Speed can be regulated through variable speed regulator to work on 220 volts A.C , speed regulator to work on 220 volts A.C.
The size distribution is often of critical importance to the way the material performs in use. A sieve analysis can be performed on any type of non-organic or organic granular materials including sands, crushed rock, clays, granite, feldspars, coal, soil, a wide range of manufactured powders, grain and seeds etc.