Papermaking Properties on Barks of Quercus crispula, Castanea crenata and Fagus crenata.

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  • ミズナラ・クリ・ブナ樹皮の製紙特性

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As a way of defining the characteristics in bark pulp quality and strength for individual wood species, a pulping study was made on Mizunara (Quercus crispula Blume), Kuri (Castanea crenata Sieb. & Zucc.) and Buna (Fagus crenata Blume). Of three species investigated, Mizunara and Kuri contain thick-walled bast fibers, and can be expected to be an additional fiber resource. Although the presence of undispersed bundles of thinwalled sieve tube members and parenchyma in the bark pulps tends to cause semitransparent spots on the sheet, it could be destroyed to disappear by lightly beating. Sufficient improvement in sheet strength was also obtained by beating. Buna that lacks in fiber was the lowest in pulp yield, and gave a sheet having low tear factor.

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