在许多应用中，需要测量纸张和其他工业材料（如纺织品或塑料）中斑点、缺陷或夹杂物的大小。该图是根据TAPPI污垢估算图编制的，旨在提供尺寸估算方法。请注意:本文件描述了使用估算图表的推荐做法；这不是实际的图表。

There are many applications where it is desired to measure the size of spots, defects or inclusions in paper and other industrial materials such as textiles or plastics. This chart was developed from the TAPPI Dirt Estimation Chart to provide a means for size estimation.PLEASE NOTE: This document describes the recommended practice for use of the estimation chart; this is not the actual chart.