TAPPI T 233 cm-15用于测量纸浆的加权平均纤维长度。如果纤维长度为1 mm，重量为w mg，那么对于给定的纸浆，加权平均长度（L）为∑（wl）/∑w、 或重量乘以每根纤维长度除以试样中纤维总重量的乘积之和。使用Clark型或Bauer-McNett型分类器将在规定的精度范围内产生相同的结果。纤维长度也可以通过使用偏振光的自动偏振光分析仪通过TAPPI T271纸浆和纸张的纤维长度来测量。

TAPPI T 233 cm-15 is designed to measure the weighted average fiber length of a pulp. If a fiber is 1 mm in length and weighs w mg, then for a given pulp, the weighted average length (L) is ∑(wl)/∑w, or the sum of the products of the weight times the length of each fiber divided by the total weight of the fibers in the specimen.Use of either Clark type or Bauer-McNett type classifier will produce identical results within the stated precision.Fiber length may also be measured by TAPPI T271 Fiber Length of Pulp and Paper by Automated Polarized Optical Analyzer Using Polarized Light.