@article{article_1375092, title={Changes in hardness values of Scotch pine (Pinus sylvestris L.) heat treated with tannin modification under different climatic conditions.}, journal={Alpha Journal of Engineering and Applied Sciences}, volume={1}, pages={17–27}, year={2023}, author={Güneş, Mehmet and Altunok, Mustafa}, keywords={Heat treatment, acorn tannin, Brinell hardness, climate, Scots pine.}, abstract={It is known that wood material undergoes dimensional changes due to its hygroscopic property. Various methods, such as impregnation and thermal treatment modification, are also applied to protect wood material against biological hazards. These methods have both advantages and disadvantages relative to each other. Thermal modification (heat treatment) generally results in a decrease in the mechanical properties of the wood materials. The most important factors contributing to this decrease in mechanical properties are the type of tree, exposure temperature, and duration. As the exposure temperature and time increase, the mechanical properties of wood decrease. In this study, samples obtained from Scots Pine (Pinus sylvestris L.) wood were impregnated with a 10% oak acorn tannin solution and subjected to thermal treatment at 150℃ for 2 hours to minimize the deteriorating effect of heat treatment and increase mechanical resistance. The samples were then conditioned under three different climate conditions: 20℃ and 65% relative humidity, 40℃ and 35% relative humidity, and 10℃ and 50% relative humidity. Density, equilibrium moisture content, and Brinell hardness values of the samples were determined after the processes. A 20% increase in hardness values was observed in the tannin-modified samples conditioned at 40℃ and 35% relative humidity.}, number={1}, publisher={Cankiri Karatekin University}