粉体の物性に関する製剤学的研究(第3報)粉体の流動性測定条件の検討

概要

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Examination was made on the influence of the depth and diameter of the rotating cylinder and the amount of sample to be exerted on the number of rotations when the sample was completely adhesive to the inner wall of the rotating cylinder, in determining the flow property of powder by means of the variable rotating cylinder apparatus. It was found that the same number of rotations would be obtainable irrespective of the depth of the rotating cylinder by increasing or decreasing the amount of sample to make the thickness of the sample layer constant in case of the same diameter of the cylinder. The fluidity index (K) obtained by substituting the number of rotations (N) and the distance between the center of the rotating cylinder and the surface of the sample layer (D_0/2) to the equation, K=17.9×10^4/D_0・N, which was introduced from the balance of the rotating force of rotating cylinder and the gravitational force affected on the sample layer, showed a constant value irrespective of the diameter of the rotating cylinder and the amount of sample, and this was a specific value for each sample. Further, the fluidity index (K) showed a good correlation with the surface kinetic angle and the angle of repose which are already known as the parameters of fluidity.
1973-05-25