20.500.12556/RUL-158797 Lepljenje viskoelastično toplotno zgoščenega lesa z lepilom na osnovi utekočinjenega lesa diplomsko delo - univerzitetni študij Bonding of viscoelastic thermal densified wood with an adhesive based on liquefied wood graduation thesis - university studies Pri zgoščevanju lesa so bili v zgodovini uporabljeni različni postopki, pri večini je predstavljala problem nestabilna deformacija pri izpostavitvi zgoščenega lesa klimi z visoko vlažnostjo. Tako je bil razvit viskoelastično toplotno zgoščen les (VTC), z izboljšanimi mehanskimi lastnostmi, za njim pa še modificiran VTC postopek, katerega produkt je stabilen zgoščen les tudi po namakanju v vodi. V raziskavi smo primerjali lepilne sposobnosti dveh lesnih vrst z dvema različnima stopnjama zgostitve. Potrebno je bilo proučiti vpliv zgostitve na lepljenje VTC lesa. Pri raziskavi smo uporabili modificirane viskoelastično toplotno obdelane preizkušance smrekovine in bukovine. Preizkušance smo zlepili z lepilom na osnovi utekočinjenega lesa in jih primerjali z lepilnimi lastnostmi preizkušancev, lepljenih s fenol-formaldehidnim lepilom. Preizkušance smo testirali s strižnimi in upogibnimi testi. Rezultati mehanskih testov so pokazali, da je lepljenje VTC lesa popolnoma primerljivo lepljenju nezgoščenega lesa. Historically, various processes have been used for wood densification. The problem with most processes was the unstable deformation that occurred if the densified wood was exposed to high humidity. This led to the development of viscoelastic thermal compression (VTC) of wood with improved mechanical properties. Later on, a modified VTC process was developed, which produces densified wood that remains stable even after being soaked in water. Our research compared the adhesive bonding properties of two types of wood with different densification levels. We had to examine the impact of densification on the adhesive bonding of VTC wood. The research was conducted with modified viscoelastic thermally compressed specimens of spruce and beech wood. The specimens were bonded with an adhesive based on liquefied wood and their adhesive bonding properties were compared with the ones of specimens bonded with a phenol-formaldehyde adhesive. The shear test and bending test were used to test the specimens. The mechanical tests showed that adhesive bonding of VTC wood is entirely comparable with that of non-densified wood. les utekočinjen les viskoelastično toplotno zgoščen les wood liquefied wood viscoelastic thermal densified wood true false false Š. Curk Slovenski jezik Angleški jezik Diplomsko delo 2024-06-20 13:15:47 2024-06-20 13:15:50 2024-07-05 03:21:58 0000-00-00 00:00:00 2016 0 Ljubljana 2016 Ljubljana XI, 39 f., [21] f. pril. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*813 2638473 UNI_Curk_Spela_2016.pdf UNI_Curk_Spela_2016.pdf 1 6451E9D574A41D0492DBC59E50A94EA1 f84a0df1b92b7eb63eeb45b5d89168a834fe2debf8ecacc57c74ce42d9bc3d2b 7601402e-2ef6-11ef-a73e-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=186519 Biotehniška fakulteta 0 0 0