Physical and mechanical properties and energy-saving modes of drying wood of black alder without artificial humidification in convective drying chambers of periodic action
Due to the considerable social and social changes of the last time in wood processing problem of replacing expensive natural materials by respectively cheaper and more affordable ones becomes increasingly relevant. Alder gains increasing popularity just like alternative to expensive raw materials. Detailed technique of the studies is proposed. The basic physical and mechanical properties of black alder wood are given, its properties as a material for furniture and interior decoration are examined. Beforehand dehydrating process of alder was mathematically modeled, values of transient humidity and other key operating parameters were obtained, and then practical industrial drying on parabolic modes was implemented. These modes include four stages with the initial warming and final WTP. Art of dehydration with such modes in practice means the ability to make rational use of moisture, contained in the wood itself, to maintain the required for qualitative and intensive drying of drying agent saturation degree. The results of the research proposed modes of low-temperature drying lumber of black alder wood in convective chambers without artificial humidification. In their physical and mechanical parameters alder wood dries well, quickly, smoothly, with desiccation it decreases in volume slightly and almost has no cracks, it is inclined to warping in the transverse plane. As a result of activities we succeeded in reducing the average length of the drying process by 30 % – from 15 to 10 days, to get I category of quality for lumber dried by soft modes, by normal modes – II category of quality.