Fundamental Study on Whole-Tree Pulping of Pinus densiliora

Abstract

林木の全体利用に関するデータを蓄積する目的で, アカマツ各部位のパルプ化試験を行い, 材の構成要素と紙質の関係を追究した。樹幹の未成熟材部および直径2cm以上の枝の材部からのパルプは樹幹の成熟材部のそれに匹敵するシートを与える一方, 細枝および樹皮のシートは極めて低い引裂き強さを示した。外樹皮には解繊困難なフェロイド細胞が存在し, これが塊状となってシートの白色斑点や弱点のような欠陥を生ずることが判明した。

In order to accumulate the fundamental data related to whole-tree utilization, a pulping study was made on each component from a tree of Akamatsu (Pinus densiflora Sieb. et Zucc.) in view of wood elements-sheet property relation. Pulps from juvenile wood in the bole as well as wood zone in the branches having more than 2 cm in diameter offered handsheets comparable to those of mature wood in the bole, while handsheets from the small branches and the bark had considerably low tear factor but high in breaking length. On the outer bark, it was found that phelloid cells are difficult to defibrate, and that the presence of their clump causes some defects in papermaking such as white spots and week points into the sheets.