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The measurement of cohesive force of moist powder was intended in liquid as well as in air. A diametrical compression technique was assumed to achieve the measurement even in liquid comparatively with ease. The suitability of the diametrical compression technique for measuring the cohesive force of moist powder was examined by comparing the cohesive force in air with that measured by a traction table method using moist precipitated calcium carbonate. The cohesive force at the contact point of moist powder bed was determined using the data of calcium carbonate and microcrystalline cellulose obtained by the compression test. In a pendular region of moistening liquid, the cohesive force at the contact point increased with increasing the filling ratio of liquid to the void in powder bed. While in the funicular region, it decreased gradually with increasing the filling ratio, which indicates that the structure of powder bed became heterogeneous due to the formation of agglomerates. This argument was confirmed by observing the resultant failure plane of the moist powder bed at the funicular state brought about by compressing. The above result indicates that the cohesive force measured at the pendular state is the intrinsic value of the primary particle but only apparent at the funicular state. The cohesive of moist bed of precipitated calcium carbonate in carbon tetrachloride was found to be smaller than that in air. This result was explained by the depression of interfacial tension of moistening liquid in carbon tetrachloride compared to that in air.

Measurement of Cohesive Force of Moist Powder in Air and Liquid by a Diametrical Compression Technique