Effect of Packing Conditions of a Fine Powder on Powder Pressure in a Bin

The effect of packing conditions on the pressure of a fine powder in a bin was examined. As the results of filling experiments of a fine powder through the sieves with different openings, it is confirmed that the powder pressure and the charge of a fine powder in a bin are influenced by the packing conditions. The reason is that the mechanical properties of a fine powder change considerably with the packing conditions, i. e., normal stress acting on the bed, the condition of agglomerating, the structure of packing, the rate of filling, and so on. The pressure and the charge of a fine powder in a bin can be estimated by Janssen's equation using the mechanical properties depending on the packing conditions.