ジグのインパーフェクション1に関する考察

Abstract

Imperfection, I of jig washer is a coefficient figure showing the separation of Tromp's normal distribution curve of which the parameter of abscissa shall be of log (D-1). Imperfection formula I=Ep/D50-1 express the relation between Ep and D50 in partition curves having same inclination. This matter is mathematically verifiableWhen less jigging number is given to particles in bed, imperfection of lower layer is better than upper layer. Difference of imperfection figure I between upper layer and lower layer decreases due to increase of jigging number and finally reach to very close imperfection figures.However, actually speaking numbers of jigging on commercial jig is not sufficient enough so as the equalize the imperfection figures for every portion of bed layer.As the observation results of separation test for 33 sets of commercial jigs, the lower imperfection figures are given for the higher separation densities.It is suggested that even through the jig's imperfection figures theoretically could be reached critical constant, but, in commercial jigs the higher separation densties are given, the lower imperfection figures are indispensably obtainable.