Abstract
This study is focused on the impacts of species characteristics on the surface roughness of five species with different wood density namely white fir, Aleppo pine, European beech, walnut and white oak. The sample specimens tested were 300x300x30 mm in size and their surface quality was evaluated by the “the direct contact method” based on a mechanical system of measurement, giving the possibility of reproducing the surface measured and analyzing its profile. The surface roughness measurements were performed with a contact stylus profilometer, holding the moisture content of the specimens constant at 10%. The evaluation of the surface characteristics of the wood samples considered the roughness parameters: arithmetic mean deviation of the profile, maximum two point height of the profile, mean roughness depth and root-mean-square deviation of the profile. From the study result showed different average values of surface roughness parameters for broadleaved and conifers species. The differences can be explain by the influence on the roughness of the wood surface of the wood texture and the texture uniformity.
Highlights
The surface of wood is the result of complex factors including the interaction of raw material used, types of processes and time
This study was focused on the evaluation of the quality of wood surface and involved samples from five forest species with different wood density namely white fir (Abies alba Mill), Aleppo pine (Pinus halepensis Mill), European beech (Fagus sylvatica L.), walnut (Juglans regia L.) and white oak (Quercus petraea Liebl), which grow in Albania and with the exception of Aleppo Pine are used in the wood processing industry as raw materials
The values in the table 2 are average values of the surface roughness parameters and their standard deviations measured for different wood species specimens processed only in the planing machine
Summary
The surface of wood is the result of complex factors including the interaction of raw material used, types of processes and time. The surface of manufactured wood elements results from a partitioning process achieved through one or more consecutive cutting and smoothing steps, which might include traditional sawing, planning, milling or sanding process, or modern laser- or water-jet cutting. Each of these processes normally has their individual characteristics, which will result in wood surfaces with different properties (Sinn et al 2009). These authors have discussed the mechanisms of defect formation, such as kinematics, cutting forces, shear induced splitting, transverse compression and tension, and presented experimental observations, which give directives for optimized cutting procedures in relations to surface roughness
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