Kopynets Z. Elaboration of drying technology for thin sawn lumber made from oak.

The subject is oak lumber in thicknesses ranging from 6 to 10 mm. The aim is to elaborate technology of drying thin oak sawn lumber in convective batch driers. The research allows to reduce the duration of the process and to lower costs for heat and electricity. The methods used are classical methods of experimental research of heat and mass exchange processes, mathematical planning for a B-plan of the second order, the classical theory of drying of timber and other pore structure colloidal materials, mathematical statistics. Apparatus: experimental unit of measurement and modern convective dryers operating in batch mode. The innovative value: for the first time it has been researched and formulated principles for low-temperature drying of oak lumber in thickness from 6 to 10 mm; it has also been defined that the convective drying of thin lumber is with no period of constant rate drying values for the first time; it has been received mass exchange coefficient of drying and moisture conductivity, moisture exchange and has been corrected the graph-analytic method to define the duration of drying of thin timber. The results received are: it has been defined the drying coefficient in laboratory setting and in industrial conditions, which can be used to process computation. It has been obtained an equation to determine the duration of drying of thin timber that allows having an accurate number of drying chambers while designing workshops. It has been designed the technology of convective drying of thin oak lumber in batch driers on basis of low-temperature and in two-stage drying schedules. It has been suggested a device to facilitate stacking of thin lumber. The implementation degree is the following: designed technological procedure of low temperature convective drying of thin oak lumber has been implemented in "Temp" Private Small Enterprise, the town of Bolekhiv. The branch is woodworking industry.