微粉粉体層の付着力に及ぼす凝集性の影響

抄録

It in known that the method of feeding powder into split cell affects the adhesion forces of powder beds, especially in fine particle powders. But the effect of the agglomeration phenomenon on the adhesion forces has not been investigated systematically.
The adhesion forces of powder beds have been measured by a split cell type tensile strength meter. The powder beds consisted of several size agglomerations which were prepared with sieves having a larger opening size than the primary particle diameter. The void fractions of powder beds were prepared with compression. Kanto loam powder, limestone powder and fused almina powder were used as samples and their primary diameter are several μm. It is found from these measurements that the adhesion forces of powder beds are decreased by the effect of the agglomeration phenomenon, especially in high voidage, and the adhesion forces have constant values when the void fractions of the powder bed is equal to the void fractions of the agglomerations in the powder bed. The mechanisms of the effect of agglomeration phenomenon are tentatively analysed.