WOOD RESEARCH Volume 70, Number 4, 2025
YANG ZHENG, MENGQING KE, CHENYANG CAI, XIAO ZHONGYANG, and HONGHAI LIU

COMPARATIVE STUDY ON THE HEAT TREATMENT OF DALBERGIA LATIFOLIA ROXB. WOOD UNDER ATMOSPHERIC PRESSURE AND VACUUM CONDITIONS

This study comparedatmospheric heat treatment (AHT) and vacuum heat treatment (VHT)of Dalbergia latifoliaRoxb. at 180°C for 6 hto improve dimensional stability. Through multiple tests, it analyzed their effects on the wood. Results showed VHT caused milder chemical changes, preserving hydroxyl and lignin structures while AHT severely degraded hemicelluloses. VHT led to lower weight loss 0.45% vs 1.25%, better dimensional stability with a greater reduction in radial swelling 0.84% vs 1.34%, higher mechanical strength (modulus of rupture: 118.22 MPa vs 95.83 MPa; modulus of elasticity 9361.50 MPa vs 8558.34 MPa), and a smaller color change ΔE*: 9.79 vs 18.65. Overall, VHT can balance performance improvement and minimize damage to the wood’s structure and aesthetics.

WOOD RESEARCH Volume 64, Number 2, 2019
Ngargueudedjim Kimtangar, Guersoube Tao, and Guy Edgard Ntamack

Study of the correlation between fiber and mechanical properties of wood Borassus aethiopum Mart. of chad

Palmyra palm (Borassus aethiopum Mart.) is a large palm tree whose wood is often used for its mechanical resistance and weathering in buildings in Africa. In this work, the influence of fibre characteristics on the mechanical properties of wood was studied. For this purpose, the mechanical characteristics were determined and study of the micrograph of the sapwood and Duramen which are the useful parts of this wood were carried out. The results of this study show the mechanical properties of the palmyra are very influenced by the number and the mechanical characteristics of the fibres. The proposed polynomial model of the evolution of the mechanical characteristics gives the good results because the maximum relative mistakes of the prevision are 4.43% for the breaking strength and 0.40% for the Young’s modulus.