Sieve mesh, aperture distribution

Figure 3.4. The operative aperture size in a sieve can be measured by examining powder grains which have been trapped in the apertures, a) Comparison of the aperture size distribution of a sieve as determined ftom direct examination of the sieve surface, trapped spherical glass beads, and trapped irregularly shaped sand grains, b) Profiles of typical sand grains trapped in the sieve mesh, c) Length and width distributions of two sets of 100 sand grains trapped in the mesh of the sieve, d) Shape distribution of the sand grains of (c).

F uie 3.2. The range of apertures permitted in a wire woven sieving surface are strictly limited by ASTM and similar standaids [10]. Shown above are the ap>erture size distributions derived from two sets of 100 measurements made at the midpoint of the apertures of a 63 mesh ASTM sieve. Note that the aperture size has been normalized by dividing the measurements by the nominal aperture size of the 65 mesh sieve. 

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