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        Last update : July 21, 2003
 
                  Second Session : The Yield Issue                  
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            6 - Effect of wood species mixtures on Kraft pulping            
M. Lecourt, D. Da Silva Perez, C. Deleuze-Brezins
(Wood-Process Laboratory, AFOCEL)

Logo EFPG Some of the key factors which affect Kraft pulp quality are the raw material performances. The availability of the forest resource, the great diversity of the French species, the fluctuating price of wood place are the different aspects French pulp mills have to take into account. In this context, using a mix of species, hardwood or softwood, is particularly interesting for plants. The optimization of the mixes is therefore a main question.

Here we present the AFOCEL's investigation of the effect of a mix of hardwood or softwood species during Kraft cooking on yield. In this work, height main French species (4 softwood and 4 hardwood) were studied. In the first part, a methodological approach is presented which is supported by the mathematical model of Scheffé (a simplex-centroid mixture design augmented with three interior points). In the second part, results are presented.

 

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