41 アカマツ材のパルプに關する研究(3) : アカマツ材の春材部及び秋材部の化學的組成分に就いて

概要

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The chemical compositions of the spring wood and the summer wood in the annual rings of "Akamatsu" wood were compared. Four trees recorded in the table I were selected for the material of this investigation. From the prescribed position of individual tree, a cross-dise of 2 cm. thick was sawed off. The spring wood and summer wood zones in the disc were splitted apart with a sharp wood chisel and removed separately. This material was ground and sieved to 60〜80 mesh sizes.The methods of analysis are the same as described in the second report of this series. The results obtained for the spring wood and summer wood of these trees are shown in the table 2. From the results the following conclusion may be obtained : (1) Crude cellulose content in the summer wood is larger than in the spring wood.(2) Percentage of lignin in the spring wood is higher than in the summer wood.(3) Percentage of pentosan in the spring wood is higher than in the summer wood, and that of mannan in the summer wood is higher than in spring wood.(4) Usually, solubilietis in cold water, in hot water, in 1% NaOH, and in alcohol benzene mixture show higher percentage in the spring wood than in the summer wood.(5) Percentage of ash in the spring wood is higher than in the summer wood.
一般社団法人日本森林学会の論文
1950-07-25