Laboratory of Wood Chemistry, Faculty of Agriculture, Kyushu University | Laboratory of Wood Chemistry, Faculty of Agriculture, Kyushu University
九州大学農学部林産学科木材化学講座
The beating behaviour of the chlorite and peracetic acid pulps prepared from beech (temperate hardwood), red pine (temperate softwood), and red lauan (tropical hardwood) was studied. The differences in the beatability of those pulps lie in the differences amongst fiber morphology of wood species and amongst holopulping conditions. An excess oxidative delignification or a sulfuric acid treatment can improve the pulp beatability. The removal of hemicelluloses and the structural modifications of the external and internal surfaces of the pulp fibers take place simultaneously in those chemical treatments. It is shown that the variation of pulp beatability depends on the structural modifications of pulp fibers rather than on the quantity of lignin or hemicelluloses or on the kind of hemicelluloses. A decrease in the degree of polymerization of the hemicelluloses can also affect the beatability of pulp fibers. It is inferred that the positive influence on pulp beatability should be attributed to the regions of structural modifications existing in the outside and inside of pulp fibers, which facilitate further their swelling and fibrillation. The presence of hemicelluloses in those regions is preferable for the amelioration of pulp beatability. The action of the excess oxidative delignification and the sulfuric acid treatment is like that of a prebeating process. A new method based on the rate of evaporation of acetone sorbed by pulp fibers has been developed to estimate the internal surface of pulp fibers.
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