Kappa number
1040344
176339073
2007-12-07T10:00:01Z
Malcolma
320496
cat
The '''Kappa number''' is an indication of the lignin content or bleachability of pulp. It measures the amount of bleach required during digestion of a wood pulp (part of the process of paper making) in order to obtain a pulp with a given degree of whiteness. Since the amount of bleach needed is related to the [[lignin]] content of the pulp, the Kappa number can be used to monitor the effectiveness of the lignin-extraction process. The number is in the range of 1-100 (10-70 for most types of wood) and is established by measuring the amount of a standard [[potassium permanganate]] [[solution]] that is absorbed by the pulp being considered. Details on how the Kappa number should be determined is published in ISO 302:2004.<ref>{{cite web | url = http://www.iso.org/iso/en/CatalogueDetailPage.CatalogueDetail?CSNUMBER=36604 | publisher = [[International Organization for Standardization]] | title = ISO 302:2004 Pulps — Determination of Kappa number}}</ref>
==References==
<references/>
{{industry-stub}}
[[Category:Pulp and paper industry]]
[[pt:NĂºmero Kappa]]