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Heat treatments are related to the action of temperature in successive stages and under controlled conditions, changing the chemical structure of wood. However, the method of treatment used may have a significant effect on the properties of the heat treated wood. In order to assess the effect of the heat treatments on the wood properties, two conifer species were considered, as well as the absence of the air through water and vapor and three levels of temperature (130, 145 and 160 °C). The experiments resulted in twelve treatments or interactions plus controls. This study describes the changes in chemical composition of wood at relatively low temperatures and its interactions with the physical and mechanical properties of the new thermally-modified wood. The analysis of the results indicates that the extractives and degradation products that remain in the wood processed in a closed reactor seem to be a very important factor affecting the results.Toplinske obrade povezane su s djelovanjem temperature u kontroliranim uvjetima pri čemu se mijenja kemijska struktura drva. Međutim, upotrijebljena metoda toplinske obrade može imati znatan učinak na svojstva toplinski obrađenog drva. Kako bi se procijenio učinak toplinske obrade na svojstva drva, napravljen je eksperiment na dvije vrste drva četinjača, koje su obrađene uz odsutnost zraka upotrebom vode i pare te pri tri različite temperature (130, 145 i 160 °C). Eksperiment je napravljen uz dvanaest kombinacija uvjeta obrade te na kontrolnom uzorku. U radu se opisuju promjene kemijskog sastava drva pri relativno niskim temperaturama i interakcije tih promjena s promjenama fi zikalnih i mehaničkih svojstava toplinski modifi ciranog drva. Analiza rezultata pokazuje da su ekstraktivne tvari i tvari nastale u drvu pri procesu toplinske modifi kacije vrlo važni činitelji koji utječu na fizikalna i mehanička svojstva drva

Effect of Hydro- and Hygro-Thermal Treatments on Some Wood Properties of Pinus Radiata and Pseudotsuga Menziesii