BF, Dept. of Wood Technology, Lj. (BFLES)
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Lastnosti lepilnih spojev lameliranega lesa iz termično modificirane bukovine : diplomsko delo = The adhesive bond properties of laminated wood made of thermally modified beech wood : B. Sc. thesisFašalek, AndrejBukovina ima kljub dobrim mehanskim lastnostim še precej neizkoriščen potencial v leseni gradnji. Ima visoko gostoto in je zelo trdna, vendar pa tudi biološko neodporna in dimenzijsko nestabilna. Te ... nezaželene lastnosti lahko zmanjšamo s postopkom termične modifikacije. Bukov les lahko tako uporabimo tam, kjer je bila njegova uporaba do sedaj omejena. Lesu se po termični modifikaciji poslabšajo nekatere mehanske lastnosti, prav tako se mu spremenijo določene lastnosti, ki lahko vplivajo na kakovost lepilnih spojev. Namen diplomskega dela je bil ugotoviti, ali bodo lepilni spoji lameliranega lesa iz termično modificirane bukovine dosegli zahteve standarda SIST EN 14080:2013. Zanimal nas je tudi vpliv predpremaza pri lepljenju s PUR lepili. Pri izdelavi nosilcev smo uporabili MUF, PUR, PUR v kombinaciji s predpremazom (PUR+P) in EPI lepilo. Po navodilih proizvajalcev lepil smo z vsakim lepilom izdelali po tri štirislojne nosilce. Izvedli smo strižni in delaminacijski test po standardu SIST EN 14080:2013. Ugotovili smo, da so zahteve za strižno trdnost lepilnih spojev dosegla vsa lepila, najvišje vrednosti so dosegli preizkušanci, zlepljeni s PUR+P lepilom (fv avg = 14,9 N/mm2), v vseh primerih pa je bil delež loma po lesu visok. Delaminacijski test smo izvedli po postopkih A, B in C. Pri vseh postopkih sta zahteve dosegli lepili MUF in PUR+P. Delaminacija lepilnih spojev je bila pri preizkušancih, zlepljenih s PUR in EPI lepilom pri vseh postopkih prevelika. Ugotovljene so bile šibke povezave med rezultati strižnega in delaminacijskega testa (R2 = 0,179 % 0,272). Potrdili smo, da nanos predpremaza pri lepljenju s PUR lepili močno poveča odpornost proti delaminaciji, prav tako je višja strižna trdnost teh lepilnih spojev.Type of material - undergraduate thesis ; adult, seriousPublication and manufacture - Ljubljana : [A. Fašalek], 2017Language - slovenianCOBISS.SI-ID - 2791049
Author
Fašalek, Andrej
Other authors
Šega, Bogdan |
Šernek, Milan
Topics
lepljenje |
termično modificiran les |
bukovina |
delaminacija |
strižna trdnost |
gluing |
thermally modified wood |
beech wood |
delamination |
shear strength
Call number – location, accession no. ... |
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Knjižnica BF za lesarstvo dv1 0000000089 IN: 020170096 Knjižnica BF za lesarstvo dv1 89 IN: 020170096 |
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Fašalek, Andrej | |
Šega, Bogdan | 13057 |
Šernek, Milan | 16382 |
Source: Personal bibliographies
and: SICRIS
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