20.500.12556/RUL-177620 Vpliv plazemske obdelave bukovine in smrekovine na lepljenje z MUF lepilom Influence of plasma treatment of beech and spruce wood on bonding with MUF adhesive Proučevali smo vpliv plazemske obdelave na lepljenje lesa navadne bukve (Fagus sylvatica L.) in navadne smreke (Picea abies Karst.) z melamin-urea-formaldehidnim (MUF) lepilom. Izdelali smo 12 trislojnih lepljencev in sicer 4 iz bukovine, 4 iz smrekovine in 4 hibridne, kjer sta bili zunanji lameli iz bukovine, notranja pa iz smrekovine. Polovico lamel smo pred lepljenjem plazemsko obdelali, druge polovice pa ne. Ugotovili smo, da plazemska obdelava ni bistveno vplivala na strižno trdnost lepilnih spojev. Tako kontrolni kot plazemsko obdelani preizkušanci so imeli podobne strižne trdnosti znotraj vsake vrste lepljenca (bukev, smreka in hibrid), v večini primerov pa je prišlo do 100 % loma po lesu. Pri dveh metodah delaminacijskega testa po standardu EN 14080 (B in C) smo opazili razliko v deležu delaminacije med kontrolnimi in plazemsko obdelanimi bukovimi lepljenci, kjer je plazemska obdelava površin lamel pred lepljenjem izboljšala adhezijo z MUF lepilom. The influence of plasma treatment on the bonding of European beech (Fagus sylvatica L.) and Norway spruce (Picea abies Karst.) wood with a melamine-urea-formaldehyde (MUF) adhesive was investigated. Twelve three-layer beams were made: four of beech, four of spruce, and four hybrid, with the outer lamellae made of beech and the inner one of spruce. Half of the lamellae were plasma treated before gluing, the other half were not. It was found that plasma treatment did not significantly affect the shear strength of adhesive joints. Both control and plasma-treated specimens exhibited similar shear strength within each type of glulam beam (beech, spruce, and hybrid), and in most cases there was 100% wood failure. In two delamination test methods according to standard EN 14080 (B and C), a difference in the degree of delamination was observed between the control and plasma-treated beech specimens, where plasma treatment of the lamellae surfaces prior to bonding improved adhesion with MUF adhesive. adhezija bukev delaminacija les MUF lepilo plazma smreka strižna trdnost adhesion beech wood MUF adhesive plasma spruce shear strength true false true Slovenski jezik Angleški jezik Članek v reviji 2025-12-29 11:36:26 2025-12-29 11:36:34 2026-01-02 04:03:48 0000-00-00 00:00:00 2025 0 0 Str. 49-60 št. 2 Let. 74 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*824.85:52-726 2590-9932 10.26614/les-wood.2025.v74n02a05 261481475 RAZ_Kotnik_Klemen_2025.pdf RAZ_Kotnik_Klemen_2025.pdf 1 F767A7C066D370FC2F1C31CB36E57529 8970e9999716c9af77c51632733828712ef5804daa1db373fee80076de0c6ed1 fbd98a8f-e4a1-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=224738 https://journals.uni-lj.si/les-wood/article/view/24657 1 c86b670b-e4a1-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=224737 Biotehniška fakulteta Les 0 0 0