Table 1: Distribution of particles.

Easily through
=0.5~0.7
Hardly through
=0.7~1
Cannot through
=1~3
Dimension (mm) 0.3 0.4 0.5 0.7 1.6 2
Number(particles /s) 160 240 400 400 1600 1200
Percentage 4% 6% 10% 10% 40% 30%
Total particle number 320 480 800 800 3200 2400