섹션 개요

    • 1-1．frequency distribution curve

      Frequency of mass or volume of particles in a given particle size range.

      The particle size with the greatest frequency is the 'mode diameter'.

      1-2．Residual curves (R-curves, sieve top curves)

      Fraction of the mass or volume of particles that 'remain' on a sieve of the same size as the particle size.

      The particle size at which the residual is 50% is the 'median diameter'.

      1-3．Passage rate curves (P-curves, under sieve curves)

      Fraction of the mass or volume of particles that 'pass' through a sieve of the same size as the particle size.

      Pass rate（P） = 1 – Residual（R）







      残留率residual　メディアン径median diameter　粒子径particle size　篩の目の大きさSieve size

      1-4．Rosin-Rammler distribution

      Empirical formula that fits well with the particle size distribution of actual powders and grain particles.

      R = exp[-(D/De)ⁿ]　(1-1)

      D is the particle size, De is the particle size at 37% residual, the higher the n value the more uniform the particle size.