Abstract
Recently, in order to reduce the green house gas the plantation is getting increased in all over the world. And also there is growing tendency toward to conservation of natural forest and wildlife. Therefore the percentage of plantation wood chip supply is getting increased at typical Japanese kraft pulp mills. The tendency like this will be accelerated in the nearly future. To correspond to the change of wood chip property is one of important missions for the pulp & paper industry. Therefore the industry is needed to operate with various ideas.
Ishinomaki LBKP plant produces Bleached Hardwood Kraft Pulp. The digester runs on the conventional cooking and the bleaching sequence is D-Eop-D. The process flow is quite typical form. On the experience of Ishinomaki LBKP plant, it is found out that the plantation wood chips bring on the lower cooking & bleaching cost but the worse plugging in a 2 ndary knotter and worse vacuum on bleach filters than the natural wood chips. The plant installed the optimized procedure of wood chip mixing and some operational ideas as the measures.
Including them, this report introduces some influences by the increase of plantation wood chips and some measures for them at Ishinomaki LBKP plant.
