METHOD OF MEASURING FRICTIONAL ELECTRIFICATION AMOUNT AND DEVICE OF MEASURING FRICTIONAL ELECTRIFICATION AMOUNT

摘要

PROBLEM TO BE SOLVED: To provide a measuring method capable of accurately and reproducibly measuring the frictional electrification amount of a two-component system sample having a wide particle size distribution or a two-component system sample in which the particle size distribution of each component is close to each other. SOLUTION: In the measuring method by a suction separation type of the frictional electrification amount of a two-component system sample comprising magnetic particles and powder, the two-component system sample is prepared so that the median diameter of volume 50% DM50 [μm] of the magnetic particles and the median diameter of volume 50% DT50 [μm] of the powder satisfy the relation of DM50>DT50, volume 90% diameter DM90 [μm] of the magnetic particles and volume 90% diameter DT90 [μm] of the powder satisfy the relation of DM90>DT90, and volume 10% diameter DM10 [μm] of the magnetic particles and volume 90% diameter DT90 [μm] of the powder satisfy the relation of DM10<2×DT90.