WOOD RESEARCH Volume 61, Number 5, 2016
Jihang Hu, Wenmiao Fan, Bin Luo, Hongwu Guo, and Li Li

Assessment of the dyeing properties of maple veneer treated by dichlorotriazine reactive dye based on fuzzy comprehensive evaluation

Effects of dye concentration, dyeing temperature and time, volume ratio, and dyeing assistant and fixing agent, fixing time on the dye-uptake and K/S were investigated with orthogonal experiments. The major factors on dye-uptake and K/S were identified using visual and variance analysis. Dye-uptake and K/S were synthetically evaluated and optimally selected with fuzzy comprehensive evaluation. Results showed that dye concentration and temperature were significantly affected by all the seven factors during dyeing process on dye-uptake and K/S. The optimal parameters for the dye effect of maple veneer were: temperature 65.0ºC, dye concentration 3.0 %, dyeing assistant 40.0 g.L-1, dyeing time 3.0 hours, fixing agent 20.0 g.L-1, fixing time 10.0 minutes, volume ratio 1:20. Additionally, attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX) results indicated that reactive dyes were combined with maple fiber and diffused into the wood lumen and wood ray. X-ray diffraction (XRD) results indicated the intensive of crystallinity in the dyed wood was declined due to the dichlorotriazine reactive dye. Furthermore, thermogravimetric analysis (TGA) demonstrated that the residue of dyed veneer was higher than undyed, and the temperature at maximum degradation rate of dyed and undyed veneer was different.

WOOD RESEARCH Volume 62, Number 6, 2017
Bin Luo, Siyu Jin, Feng Cheng, Junhua Ying, Xue Bao, Hongguang Liu, and Li Li

Study on sanding force, power consumption and quality of calibrating sanding recombinant bamboo

Recombinant bamboo is a new kind of bamboo-based panel material that has been widely used as a structural material. However, there are many problems in the sanding process of this material. This study analyzes the impacts of sanding parameters on sanding force, sanding active power and sanding efficiency in sanding recombinant bamboo, which is meaningful for improving the sanding quality, reducing power consumption and collocating the sanding parameters more reasonably. Granularity, feed speed, sanding speed and setting sanding thickness have different influences on sanding force, sanding active power and sanding efficiency, and the grey relevancy results show that feed speed has the most significant effect on sanding force, sanding active power and sanding efficiency. The actual sanding thickness is smaller than setting sanding thickness, and the difference between actual and setting values (ΔTs) is influenced by sanding parameters. Taking a comprehensive consideration of ΔTs and standard deviation of actual sanding thickness, determine the optimum schemes according to the method of fuzzy comprehensive evaluation.