ポリマ粉末加圧成形の静的諸特性に関する研究

Abstract

This study of solidifying mechanism of polymeric powder in cold compaction molding, made consideration in light of dynamics based on the results of experiments and explained the mechanism of solidification visually and theoretically. (1) It was shown that the more the compacting pressure is, the more indistinct the boundaries between adjacent particles are made, the wider the fusion spots become, and the higher the strength of the cold compacted products become, and that the dynamically compacted products show markedly better fusion between adjacent particles and much higher strength than the statically compacted ones. (2) Furthermore, among compacting pressure Pc, tensile strength σB, and average density of products ρ, empirical formulae of σB=K3(Pc)n3 and σB=K4(ρ)n4 were obtained. (3) In various model experiments, the deforming behavior of particles involved in compaction was observed visually, and as a result, with particles crushed greatly in layer with the increase of compacting pressure, an empirical formula of R=a(Pc)-nR was obtained between the crushed particle ratio R and the compacting pressure Pc, while an empirical formula of T=b(Pc)-nT was obtained between the thickness of products T and the compacting pressure Pc. (4) Furthermore, it was found that in compaction molding on single punch, particles are crushed more on the punch side than on the die side, while they are evenly crushed generally in compaction molding on both side punch.