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Studies on the Papermaking Properties of Hydroxyethylated Kraft Pulps from Mangrove Woods

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概要 Mangrove wood fibers generally lack flexibility because of their thick cell walls. Due to this defect pulps prepared from Mangrove woods form weak and bulky papersheets. Hydoxyethylation was applied t...o the Mangrove pulp in order to improve its papermaking properties. A remarkable difference was observed between the behavior of hydroxyethylated Mangrove pulps and that of a hydroxyethylated domestic hardwood pulp studied for comparison. A very slight hydroxyethylation (i. e., hydroxyethylation with the use of 1 % ethylene oxide on the basis of pulp weight) brought about a considerable increase in the sheet strength properties of the Mangrove pulps, while higher levels of hydroxyethylation which caused a marked improvement of the papermaking properties for the domestic hardwood pulp brought deterioration on the Mangrove pulps. Scanning electron microscopy revealed that the slightly hydroxyethylated Mangrove pulp fibers were finely fibrillated by refining and suffered remarkable deformation in papersheet formation, while the highly hydroxyethylated fibers suffered little fibrillation and deformation. Results of some other investigations suggest that a partial extraction of hemicelluloses from the thick cell walls contribute to the increase in the flexibility of the fibers and a part of the effect of the slight hydroxyethylation can be attributed to this effect.続きを見る

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登録日 2012.07.31
更新日 2015.11.13