WOOD RESEARCH Volume 64, Number 6, 2019
Biqing Shu, Qin Ren, Qian He, Zehui Ju, Tianyi Zhan, Zhen Chen, and Xiaoning Lu

Study on mixed biomass binderless composite based on simulated wood

This article describes techniques used to study mixed biomass fiberboards based on the simulation of wood composition, in which high-strength bamboo could serve as wood cellulose, low-density poplar could serve as wood hemicelluloses, and lignin-rich walnut shells could serve as wood lignin. The effects of different material mass ratios on board properties were discussed, and the bonding mechanisms of the mixed binderless composites were analyzed through Fourier transform infrared spectroscopy (FTIR) and environmental scanning electron microscopy (ESEM). Experimental results showed that the simulation could identify bio-fiberboard compositions with good performance.

WOOD RESEARCH Volume 65, Number 1, 2020
Zehui Ju, Qian He, Tianyi Zhan, Haiyang Zhang, Lu Hong, and Xiaoning Lu

Calculation of sound insulation of softwood samples at normal incidence and comparison with experimental data

The acoustic simulations were carried out for softwood and composites in order to evaluate their sound properties. Theoretical value of sound insulation was predicted by regarding the substances in the wood cell wall as equivalence to specific medium based on Biot model, and the wood microscopic characteristics, such as the length and diameter of tracheid, diameter of pit, and porosity, were taken into account for determining the equivalent density and bulk modulus of wood. By comparing the tested and predicted values of sound insulation, the conclusions were drawn as follows: the predicted values of sound insulation were significantly correlated with the tested values for wood and wood composites. As for Masson pine, the adjacent of earlywood and latewood was considered as sandwich structure for the calculation of sound insulation. The transfer function involved in sound insulation simulation provided an effective method to characterize the sound insulation volume of wood and wood composite in construction and decoration areas.