This method 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. 

 

IPS uses the Bauer McNett type classifier for this method. The classifier has four tanks set up in a cascade arrangement from the largest openings to the smallest. The weight percent on the four screens and the percent that passed through the smallest screen (the fines portion) is reported.

 

The Bauer-McNett type classifier requires 10 oven dry grams for each test replicate. To perform adequate testing, the equivalent of 24 oven dry grams is desired. This ensures proper disintegration and that a duplicate can be tested on each sample. 

 

Please note:
IPS cannot sell or otherwise provide standards, specifications, or test procedures to third parties.