遠心力場における粉体粒子の充てん特性

概要

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The bulking properties of fine powder in centrifugal fields were investigated,using CaCO_3, Al_2O_3 and other pharmaceuticals having different particles size. The cylindrical tube filled with a known weight of powder was se to the rotor driven by a variable speed electric motor, and whirled until the level of the powder cased to change. The apparent volume of the powder was varied with the magnitude of centrifugal force. The relation between ε, the porosity, and F, the average centrifugal force acting on a single particles, was given by the following equation for each materials ε=k(1/F)^n+0.26 where k and n are constants. Tapping experiments were also carried out on the same powder. The final porosity was varied with the magnitude of tapping impact which is the function of the falling height H. The data for each material were correlated by ε=h(1/mgH)^n'+0.26 where m is the mass of a single particles, g is the gravitational acceleration, and h and n' are constants. There results support the assumption that the bulkiness of a fine powder is affected by the balance between the adhesion force of particle and the external force acting on an individual particle.
社団法人日本材料学会の論文
1969-06-15