筛分分析是测定散粒物料粒度特性的重要方法,在国民经济各部门中应用很广。为了保证筛析工作的标准化,各主要工业国家先后制订了有关试验筛的国家标准。近年来,在国际标准化组织(ISO)的协调下,各国试验筛筛孔尺寸标准已日趋统一。我国各单位筛析时所用筛孔尺寸序列极不统一,这一方面是由于国产试验筛的制造尚未标准化,另一方面也是因为国内现有书刊上有关各国试验筛标准的介绍较为混乱,所引标准资料大多是早已过期的,有的还误将某些国家个别工厂早期生产的试验筛规格当做该国的国 Sieving analysis is an important method for measuring the granularity characteristics of bulk materials. It is widely used in all sectors of the national economy. In order to ensure the standardization of screening work, major industrial countries have formulated national standards on test sieve. In recent years, under the coordination of the International Organization for Standardization (ISO), national standards for screening sieve openings have become more uniform. The sieve size series used in sieving in our country are very inconsistent. This is because the manufacture of domestic test sieve has not been standardized, on the other hand, it is also because of the confusion in the existing books and magazines about the standard test sieve in various countries Most of the standard information is already outdated, and some mistakenly put the test sieve sizes produced by individual factories in some countries earlier as the country of the country