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

Abstract

樹皮パルプの製紙特性を明らかにする目的で, ミズナラ・クリ・ブナ樹皮のパルプ化試験を行った。供試した3樹種のうち, ミズナラとクリの樹皮は厚壁のじん皮繊維を含み, 繊維原料としての期待ができる。薄壁の師要素及び柔細胞は解繊困難でシート表面に半透明の斑点を生じたが, これらは叩解によって消失し, 紙力の向上も認められた。一方, じん皮繊維を欠くブナはパルプ収率が低く, 比引裂き強さの弱いシートを与えた。

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.