General approach and principles Wood and other cellulosic materials (collectively called “lignocellulosics”) can be traditionally processed (i.e., partly “fractionated”) in a number of ways, using mechanical, chemical (including biochemical), thermochemical and thermal (combustion) methods (Figure 1). Nowadays, the average proportions of the total wood utilisation are as follows:1 fuel 50−55 %, construction 25−30 %, fibre
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