was examined fig1 a 600 mm u00d7 600 mm birch plywood sample having a thickness of 12 mm was produced the birch plywood was formed of 1 5 mm thick veneers 2 which were joined to one another by gluing with liquid phenolic resin adhesive 4 intelligent identifiers 3 were placed between the topmost veneer layers 2 by gluing them to the glue line the production conditions were as follows pressing temperature 130 u00b0 c pressure 1 6 mpa and time 12 min based on the test it could be observed that an intelligent identifier remains operational when it is attached to the glue line between veneers in this test placement of intelligent identifiers on the glue line between the veneer layers of the plywood when the plywood was additionally coated was examined a 600 mm u00d7 600 mm birch plywood sample having a thickness of 12 mm was produced the birch plywood was formed of 1 5 mm thick veneers which were joined to one another by gluing with liquid phenolic resin adhesive 4 intelligent identifiers were placed between the topmost veneer layers by gluing them to the glue line the plywood formed was coated with 120 g m 2 polyphenol coating by hot pressing the production conditions were as follows in the production of the plywood the pressing temperature was 130 u00b0 c pressure 1 6 mpa and time 12 min and in the coating process the pressing temperature was 130 u00b0 c pressure 1 4 mpa and time 6 min based on the test it could be observed that an intelligent identifier remains operational when it is attached to.