High Kappa Process for Eucalyptus Fiberline - The First Industrial Case, 19PEERS
The increasing pressure for costs reduction within pulp mills drives the need to maximize efficiency in the use of wood, which represents the major cost in pulp production. In this context there is a demand to re-evaluate kraft pulping processes, dominant for almost a century, in order to cope with the cost-effectiveness challenges mills are facing nowadays.
Cooking is the process where most of the delignification of the wood occurs, with about 95% of lignin removed. Cooking to a high Kappa number has been reported as an effective alternative to overcome the overcooking risk. Trials carried out by Suzano (laboratory and industrial scale) over the past 8 years reported better results when working with higher end Kappa in the kraft process, with no increase in the reject content. The major breakthrough lays in the impregnation step, combined with a specific way of cooking; together they can provide conditions to shift the defibration point to a higher Kappa number (21 to 23) than the typical kraft process range (17 to 18).
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