20.500.12556/RUL-183081 Penetracija lepila pri lepljenju termično modificirane in nemodificirane bukovine Adhesive penetration in the bonding of thermally modified and unmodified beech wood V diplomski nalogi smo proučevali vpliv vrste lepila in termične modifikacije lesa na penetracijo lepila pri lepljenju bukovine. Namen raziskave je bil določiti maksimalno in efektivno penetracijo lepila ter debelino lepilnega sloja pri uporabi štirih različnih lepil (MUF, 1K-PUR, 1K-PUR+P in EPI) na termično modificirani in nemodificirani bukovini. V empiričnem delu smo pripravili mikroskopske preparate iz lepljencev ter jih analizirali s svetlobno mikroskopijo in programsko opremo za analizo slik. Rezultati so pokazali, da vrsta lepila pomembno vpliva na globino penetracije. Poliuretanska lepila (1K-PUR in 1K-PUR+P) so dosegala največjo in najbolj stabilno maksimalno penetracijo ne glede na modifikacijo lesa, medtem ko je lepilo EPI izkazovalo najmanjšo penetracijo in največjo debelino lepilnega sloja. Lepilo MUF je dosegalo visoko maksimalno penetracijo pri nemodificirani bukovini, pri modificirani pa se je njegova učinkovitost izrazito zmanjšala. Vpliv termične modifikacije lesa na penetracijo ni bil enoten, saj je bil odvisen od vrste lepila. Penetracija lepila je bila v vseh primerih večja v rani les kot v kasni les, kar je povezano z razlikami v strukturi in gostoti lesa. Rezultati potrjujejo, da je penetracija lepila odvisna od vrste lepila, medtem ko vpliv termične modifikacije lesa ni enoten. Penetracija lepila je bila v vseh primerih zadostna, da je zagotovila ustrezno strižno trdnost lepilnih spojev, ugotovili pa smo tudi vpliv predpremaza na penetracijo 1K-PUR lepila ter da je odpornost lepilnih spojev proti delaminaciji odvisna od vrste lepila in uporabe predpremaza. Ugotovitve prispevajo k boljšemu razumevanju lepljenja bukovine in izbiri ustreznih lepil glede na lastnosti lesa. In this bachelor’s thesis, the influence of adhesive type and thermal modification of wood on adhesive penetration in bonded beech wood was investigated. The aim of the study was to determine the maximum and effective penetration, as well as the bondline thickness, using four different adhesives (MUF, 1K-PUR, 1K-PUR+P, and EPI) on thermally modified and unmodified beech wood. Microscopic specimens were prepared from bonded samples and analysed using light microscopy combined with image analysis. The results showed that the type of adhesive significantly affects penetration. Polyurethane adhesives (1K-PUR and 1K-PUR+P) achieved the highest and most consistent maximum penetration, while the EPI adhesive exhibited the lowest penetration and the greatest bondline thickness. The MUF adhesive showed high maximum penetration in unmodified beech wood, whereas its effectiveness was reduced in thermally modified wood. The effect of thermal modification on penetration varied depending on the adhesive type. In all cases, penetration was greater in earlywood than in latewood due to differences in wood structure. The results confirm that adhesive penetration is strongly influenced by adhesive type, while the influence of wood thermal modification is not uniform. The penetration of the adhesive was sufficient in all cases to ensure adequate shear strength of the bonded joints. We also found that the use of a primer influences the penetration of the 1K-PUR adhesive, and that the resistance of bonded joints to delamination depends on the type of adhesive and the use of a primer. The findings contribute to a better understanding of bonding in beech wood and support the selection of suitable adhesives according to wood properties. penetracija lepilni spoj nemodificirana bukovina termično modificirana bukovina penetration bondline unmodified beech wood thermally modified beech wood true false false [P. Repar] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2026-06-04 07:15:28 2026-06-04 07:15:52 2026-06-07 03:17:21 0000-00-00 00:00:00 2026 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*824.85 279874 280531971 57726.pdf 57726.pdf 1 A86AABF86F8C354B3CBCDFF882097A3B baa5d6ac23b91f931fa3e95a314c627e37e14c370ec8763dea2dd51fbacbc9ca 20868290-5fd4-11f1-b0ab-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=234922 Biotehniška fakulteta 0 0 0