In this thesis, research on biopolymer coating from shellac was performed and a solution of SWANLAC ASL 10 was tested on three different types of cardboard from non-native invasive plants. One of the objectives was to determine the extent to which the above solution in combination with cardboard is suitable for packaging purposes. The theoretical part presents the basic functions of packaging and describes the terms paper and cardboard, as well as the process of shellac production in more detail. Other manufacturers of biopolymer coatings and the options they offer are also listed. Three types of cartons from various non-native plants named twigs, knotweed and acacia, which were created within the project APPLAUSE at the Institute of Pulp and Paper in Ljubljana, were used to test the solution. Different areas of application of shellac were listed and the solution in which the cartons were coated, dried, cut into the intended format and used for further analysis, was described in detail. The basic, mechanical, surface and structural properties of six different samples — three without coating and three coatedwiththeSWANLACASL10solution— weretested.Thesampleswerealso printed with an UV droplet printer, checking the print quality and their abrasion resistance. After testing, average values, standard deviations and coefficients of variation were calculated, and the measurements were compared in detail. The result of the diploma thesis titled "Improving the Barrier Properties of Packaging Paper With Biopolymer Coatings" is a tested solution that could be used in combination with specific types of cardboard for the purpose of creating a barrier in packaging and reducing the use of non-degradable plastic coatings.