The utilization of low-grade thinning log of young sugi (Cryptomeria japonica) is recently one of the important subject for a future study. In this investigation, various types of laminated lumber of sandwich construction were designed by using the low-grade Sugi lumbers from thinning log as core lamina and the high-grade Sugi and Hinoki (Chamecyparis obtusa) from mature log and the high-quality Matoa (Pometia pinnata) from tropical forest as face lamina, in order to utilize the juvenile and knoty lumber of Sugi from thinning log, having low modulus of elasticity (MOE) which vary largely over the length of lumber. In the case of the core ratio of less than 0.5 to the whole depth of laminated lumber, the modulus of elasticity of laminated lumber could be high quality guaranteed and evenly localized over the length of laminated lumber.
Mendeley出力
