B - Operations – Transporting – 07 – C
Patent
B - Operations, Transporting
07
C
B07C 5/16 (2006.01)
Patent
CA 2446895
The invention relates to a method for recovery of branch knot wood and/or normal wood from oversize chips, and according to the invention the oversize chips are ground to splinter, which then is dried and mixed with water, and then the sedimented splinter containing high concentrations of extractive substances and having a high specific weight is recovered and extracted in order to recover valuable extractive substances, particularly lignans. The lighter splinter floating up to the water surface is recovered in order to recover normal wood material for the pulp production.
L'invention concerne un procédé de récupération de bois de noeud de branche et/ou de bois normal à partir de copeaux surdimensionnés, qui sont broyés en éclats, séchés puis mélangés à de l'eau. On récupère les éclats sédimentés, de poids spécifique élevé, contenant des concentrations élevées de substances d'extraction et on réalise sur ces éclats une extraction dans le but de récupérer des substances de valeur, en particulier des lignanes. On récupère aussi les éclats plus légers qui flottent à la surface de l'eau, constitués de bois normal, et qui sont destinés à la production de pâte à papier.
Eckerman Christer
Holmbom Bjarne
Oy Separation Research Ab
Robic
LandOfFree
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