一、序言使某种粉体原料分级,当评价其分级效率时,所得分级效率值因测定方法不同而异。而评价分级效率时,粒度分布的测定是不可缺少的。根据粒度测定方法之不同,对分级效率会产生不同评价。为了在测定断续的粒子直径(标准直径)情况下,评价连续的粒度分布,必须采用统计手段进行推算。本文对用筛分法评价粉体原料的分级效率时,利用具体例子的数值求出分级效率的变化,说明分级效率的值,由于不同测定方 First, the preamble of a powder raw materials grading, when evaluating the grading efficiency, the resulting grading efficiency value varies with the measurement method. The evaluation of the classification efficiency, the determination of particle size distribution is indispensable. Depending on the method of particle size determination, different ratings will be applied to the classification efficiency. In order to evaluate the continuous particle size distribution in the case of intermittent particle diameter (standard diameter), statistics must be used for the estimation. In this paper, when using the screening method to evaluate the classification efficiency of powder raw materials, the value of specific examples is used to calculate the change of classification efficiency, and the value of classification efficiency is described. Since different measurement parties