In the theoretical part of the thesis, we focused on the description of birch and chemical composition of birch bark. We investigated, what is the current use of bark in different industries. In the thesis, we described adhesive fillers, urea-formaldehyde adhesives and also the bonding theory itself. At the end of the theoretical part, we described production of veneers by peeling and the principle of plywood production. The main task of the practical part of the diploma thesis was to find out, whether birch bark can be used as an urea-formaldehyde adhesive filler in plywood production. We described the method of debarking and the production of bark fine fraction. We detected the properties of plywood made by this technology using mechanical and physical tests. We also tested, which proportion of bark in the range from 10 to 20 %, would be the most suitable for production and in which proportion we measured the best properties. To compare the results, we made plywood, in which we used technical flour as a filler. We compared the results in the tables and evaluated, whether birch bark is suitable as an additive to the adhesive mixture.