粉体の充填に関する研究(第1報) : 遠心充填

概要

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The bulkiness of fine powders in centrifugal fields was investigated, using CaCO_3,Al_2O_3,and other pharmaceuticals having different particle size. The cylindrical tube filled with a known weight of powder was set to the rotor driven by a variable-speed electric motor, and whirled until the apparent volume of powder no longer changed. The apparent volume of the powder varied with the magnitude of centrifugal force. The relation between ε, the porosity, and F, the average centrifugal force acting on a single particle, was given by the following equation for each material [numerical formula] where k and n are constants. Tapping experiments were also carried out on the same powders. The final porosity was varied with the magnitude of tapping impact which is the function of falling height, H. The data for each material were correlated by [numerical formula] where m is the mass of a single particle, g is the gravitational acceleration, and h and n' are constants. These results support the assumption that the bulkiness of a fine powder is affected by a balance between the adhesion force of particle and the external force acting on an individual particle.
公益社団法人日本薬学会の論文
1969-07-25