59 單板及合板の收縮並膨脹率

概要

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This experiment is about the shrinkage and swelling of the veneer and plywood of HINOKI-wood (Chamaecyparis obtusa S. et Z.) in some directions. The veneers used were cutted 2 mm thick and in different directions with respect to the tree. The plywood were made up of 3 layers (tangential veneers of each 2 mm thick) with the grain of core or core and backveneer at an angle with the surfaceveneer (see Fig. 8,9) and glued with milk-casein. The results are as follows ; 1) W.L. Greenhill's theoretical formula (1940) [numerical formula] which denotes the relation of the shrinkage in certain direction on transversal section to the angle θ which is bearing between the growth-rings and the direction above mentioned, coinsides nearly with the empirical data, not only in a palne of radial-tangential axis (Fig. 5), but also in any plane of radiallongitudinal axis (Fig. 3), tangential-longitudindinal axis (Fig.4), and in any other plane which contains the longitudinal axis and the axis on a plane of radial-tangential axis (Fig. 6). 2) Then we obtained a stereographic projection of the anisotropic shrinkage of HINOKI-wood (Fig. 7) where the main axes are the ordinary 3 directions of wood structure. 3) Shrinkage of upper-mentioned 3 plied plywood in a certain direction is less than shrinkage in same direction of any consisted veneers or is equal to the minimum value of them (Fig. 10).
一般社団法人日本森林学会の論文
1950-10-25