20.500.12556/RUL-154 Omočitev in adhezija pri lepljenju hitro rastočih lesnih vrst diplomsko delo (visokošolski strokovni študij) Wetting and adhesion at gluing fast growing timber graduation thesis (higher professional studies) Raziskovali smo omočitev in adhezijo pri lepljenju hitro rastočih lesnih vrst. Uporabili smo fenol-formaldehidno lepilo GP 3110 in 5 pri nas komercialno manj pomembnih lesnih vrst: brezo, črno jelšo, topol, zeleni bor in vrbo. S pomočjo mikroskopa, digitalnega fotoaparata in računalnika smo ugotavljali kontaktni kot kapljice fenol-formaldehidnega lepila na posameznih lesnih vrstah. Vroče smo zlepili po 2 lameli ter iz takih lepljencev izdelali preizkušance za ugotavljanje strižne trdnosti. Te smo pred meritvijo izpostavili različnim pogojem kot so klimatiziranje, namakanje v vodi, kuhanje in sušenje. Strižni preizkus smo izvajali s pomočjo univerzalnega testirnega stroja Zwick Z100. Ugotovili smo, da se kontaktni koti lepila med posameznimi lesnimi vrstami niso veliko razlikovali. Najmanjši kontaktni kot lepila smo izmerili pri zelenem boru (najmanjša gostota lesa), največjega pa pri brezi (največja gostota lesa). Na strižno trdnost lepilnega spoja preizkušancev je vplivala priprava oziroma pogoji pri katerih smo tretirali in testirali preizkušance. Na trdnost lepilnega spoja je vplivala tudi gostota lesa. Wetting and adhesion at gluing of fast growing species was studied. Phenol-formaldehyde glue GP 3110 and 5 commercially less important wood species (birch, black alder, poplar, green pine and willow) were used. A microscope, digital photo camera and computer were used to find the contact angle of phenol-formaldehyde glue drop on specific wood species. 2 lamellas were hot glued together. Testers made for measuring the shear strength were exposed to different conditions (acclimatisation, soaking in water, boiling). The shear test was performed with Zwick Z100 universal testing machine. Contact angles did not differ much among specific species. The lowest contact angle was measured at green pine wood (lowest wood density), the highest at birch wood (highest wood density). It was also found that the shear strength of the adhesive bond of the testers was influenced by the conditions under which they were treated and tested. Wood density also influenced shear strength. lepljenje lesa fenolno lepilo kontaktni kot strižna trdnost adhezija wood gluing phenol glue contact angle shear strength adhesion true false false [I. Kalčič] Slovenski jezik Angleški jezik Diplomsko delo 2014-07-11 12:24:23 2014-07-11 12:24:23 2022-07-11 10:07:13 0000-00-00 00:00:00 2006 0 Ljubljana 0 IX, 43 f. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*824.832 1453449 vs_kalcic_izak.pdf vs_kalcic_izak.pdf 1 9B33BB882B005A723131BF8EF58EA70F 8a1d3a2d9cd6db626b886d47a0017a72aa66ac9dbea7b9b06d55527106edbb1b 56974b86-a1b9-11eb-a523-00155dcfd717 20.500.12556/rul/8d1fcd75-05bf-4f5a-b1e4-c4f1d2acf4b0 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=132207 Biotehniška fakulteta 0 0 0