Abstract
It has been considered that a variation of bulk density value, which is one of the most important characteristics of powdered materials, depends on the physical properties of the particles and the ways of packing. The important problems for the determination of bulk density of powder are how to get (1) loose packing, (2) high precision and good reproducibility and (3) simple and speedy measurement.
The authors have tried to solve these problems and obtained that a loose packing can be achieved by employing horizontal vibration without accompanying an initial large shrinkage of volume, which is common in tapping or vertical vibration. The actual measurement of bulk density indicates that the date lie within 1% coefficient of variation in the case that the horizontal vibration is applied during the flow-in packing process and the leveling-off process simultaneously.
