Advanced Atline Kappa measurements with NIR-Spectroscopy for Fiberline Optimization, 2016 Pulping, Engineering, Environmental, Recycling, Sustainability (PEERS) Conference Proceedings

With increasing worldwide competition, pulp and paper manufacturers require greater emphasis on cost reduction, increased product efficiency and quality, while minimizing environmental impact. Although the chemical recovery process plays a critical role in the economic viability of pulp mills, efficient operation of the digester is equally important to ensure excellent yield and product quality.

The kappa number of pulp, or residual lignin content, estimates the extent of delignification in the cooking process and is a critical parameter for digester and bleaching processes. To optimize cooking yield and product quality, kappa number is used as a feedback parameter to automated control algorithms, allowing for adjustments to the liquor charge and time‐temperature profile of the digester, as well as the bleaching chemical charge in the bleach plant. Kappa measurement has become even more critical due to greater variability in chip quality (i.e., moisture content, size distribution, and species mixtures) necessitating varying cooking conditions; thus greater demand on more frequent kappa measurements. 

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