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.

WOOD RESEARCH Volume 64, Number 3, 2019
Endre Magoss, Zsolt Molnár, Veronika Suri, and Ingrid Fuchs

Evaluating of wetting-induced effects on the surface stability of sanded wood

A sanding is a common woodworking operation to smooth the surface prior to apply surface finish or coating materials. All cutting processes damage the upper layer of wood surface and sanding also creates a deformation zone. This deformation zone is sensitive to artificial or environmental actions, especially to wetting. In order to determine the effect of wetting on the surface properties, to get insight into the dynamics of surface movement as a function of time during the wetting, special 3D surface roughness measurements were carried out and evaluated. For sanding of samples the most common grit sizes were selected and P100 and P180 sand papers were used. Measuring the weight of the samples the dynamics of evaporation of the applied water was also determined. The surface modification after wetting is caused by moisture gradients in the upper layer associated with swelling and shrinkage resulting in permanent deformations. For this layer the most characteristic roughness parameters are the average roughness Sa and the Abbott parameters Spk, Sk and Svk. The extent of roughness variation due to wetting is characterised by the ratio of roughness after wetting to the initial roughness value. The measurement results have shown that the simultaneous infiltration and evaporation rate has a definite influence on the surface roughness modification. The most stable wood species with the least modification were the ring-porous species, following by the diffuse-porous and conifers species. The evaporation rate measured followed the same sequence for wood species investigated.