20.500.12556/RUL-657 Vpliv temperature in trajanja postopka termične modifikacije lesa na fungicidne lastnosti modificiranega lesa diplomsko delo - univerzitetni študij Influence of temperature and duration of thermal modification process on fungicidal properties of modified wood graduation thesis - university studies Termična modifikacija je eden izmed komercialno najuspešnejših postopkov modifikacije. Pomemben kazalnik kakovosti termične modifikacije lesa je izguba mase, ki je funkcija časa in temperature izpostavitve. Ugotavljali smo, kateri parameter bolj vpliva na odpornost lesa na glive razkrojevalke. Vzorce bukovine, ki so bili 1, 1,5; 2; 3; 4; 6; 8; 16; 36 ur termično modificirani pri temperaturi 180 °C in 220 °C, smo izpostavili glivi Trametes versicolor. Smrekovino, ki je bila 1, 1,5; 2; 3; 4; 6; 10; 16; 36; 72 ur termično modificirana pri temperaturi 180 °C in 220 °C, smo izpostavili glivi Gloeophyllum trabeum. Po 16 tednih izpostavitve vzorcev glivam smo z gravimetrično metodo določili izgubo mase in jo primerjali z izgubo mase med samim postopkom termične modifikacije. Ugotovili smo, da je odpornost lesa proti glivam v linearni povezavi z izgubo mase, nastale med postopkom termične modifikacije. Kako pridemo do izgube mase med termično modifikacijo (daljši čas in nižja temperatura ali krajši čas in višja temperatura) ni pomembno, saj je odpornost proti glivam primerljiva. Pri modifikaciji pri nižji temperaturi (180 °C) ne dosežemo dovolj velikih stopenj modifikacije, da bi les ustrezno zaščitili. Vpliv postopkov termične modifikacije na kratkotrajne navzeme vode smo določali s tenziometrom, in ugotovili, da so vzorci z višjo stopnjo modifikacije bolj hidrofobni. Thermal modification is one of the commercially most successful modification processes. One of the main parameters of quality of thermally modified wood is the loss of mass during the process, which is a function of time and temperature. We examined which parameter has more influence on wood resistance to fungus decay. Samples of beech were thermally modified at temperatures 180 °C and 220 °C for 1; 1,5; 2; 3; 4; 6; 8; 16; 36 hours, and exposed to Trametes versicolor. Samples of spruce were thermally modified at the same temperatures for 1; 1,5; 2; 3; 4; 6; 10; 16; 36; 72 hours, and exposed to Gloeophyllum trabeum. After 16 weeks of exposure to the fungi, the loss of mass was determined with a gravimetric method, and compared to the loss of mass caused by thermal modification process. The resistance of wood against decay caused by fungi is linearly correlated with the loss of mass due to thermal modification. It is not important how mass loss during the thermal modification is obtained (longer time and lower temperature or shorter time and higher temperature) the resistance to fungi being comparable. Using thermal modification at lower temperature (180 °C) we cannot achieve adequate modification to sufficiently protect the wood against fungi. The effect of thermal modification processes on short term absorption of water was determined with tensiometer; the samples with a higher level of modification were more hydrophobic. les termična modifikacija temperatura odpornost navzem wood thermal modification temperature resistance sorption true false false [N. Štabuc] Slovenski jezik Angleški jezik Diplomsko delo 2014-07-11 12:26:33 2014-07-11 12:26:33 2022-07-11 10:38:46 0000-00-00 00:00:00 2012 0 Ljubljana 0 X, 49 f. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*844 2020233 dn_stabuc_niko.pdf dn_stabuc_niko.pdf 1 58721DA46C9C5770BF3DA775769AD365 ce906967d2c50bcdc74c3fe466d537ca8ea6df47370ff3e6e150fac959d1bac7 670c3215-a1b9-11eb-a523-00155dcfd717 20.500.12556/rul/56a1de22-84fa-4214-9b71-462edbecef83 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=132457 Biotehniška fakulteta 0 0 0