1134 KB33 KB199820242019Antonović, AlanMedved, SergejŽgajner, Damjanštevilka:1letnik:68str. 25-35ISSN:0024-1067COBISSID_HOST:3085449URN:URN:NBN:SI:doc-SGOSX4SSenZveza društev inženirjev in tehnikov gozdarstva in lesarstva SlovenijeLes (Ljubljana)compression shear strengthfurnirna ploščahumid conditioniverna ploščaMDFOSBparticleboardplywoodshear strengthstrižna trdnosttlačni strigvlažna klimavodawaterThe dynamics of thickness swelling and bond strength loss of different wood-based panels at exposure to humid climate and immersion into water| Dinamika spreminjanja debelinskega nabreka in kakovosti zlepljenosti različnih lesnih ploščnih kompozitov pri vlažni klimi in potopitvi v vodo|An important aspect of wood-based panel usability, especially for construction, load bearing purposes or when in use for longer time, is its resistance against water. The resistance against water is related to type of wood- based panel, morphological characteristics of the constituents that panel is made of, and from the resin that was used for bonding. In an experiment we used four different wood-based panels, namely MDF (urea-formaldehyde adhesive), particleboard (urea-formaldehyde adhesive), OSB (melamine-urea-formaldehyde adhesive) and beech plywood (me- lamine-urea-formaldehyde adhesive). All panels were immersed into water and exposed to a humid climate for 90 days. Thickness swelling, compression shear strength and shear strength were determined after 1, 5, 30 and 90 days. The results showed that the highest strength decrease was observed at immersion into water. The lowest compression shear strength after immersion into water and exposure to a humid climate was determined for MDF. The occurrence of constituent failure due to mexposure to water was demonstrated through SEM analysisPomemben dejavnik uporabnosti lesnih ploščnih kompozitov pri gradnji in nosilnih konstrukcijah je odpornost le-teh proti delovanju vode. Odpornost proti delovanju vode je odvisna od vrste lesnega ploščnega kompozita, morfoloških lastnosti gradnika, iz katerega je plošča narejena, in lepila, uporabljenega za lepljenje. Za izvedbo raziskave smo uporabili štiri različne lesne ploščne kompozite in sicer MDF (urea-formaldehidno lepilo), iverno ploščo (urea-formaldehidno lepilo), OSB (melamin-urea-formaldehidno lepilo) in bukovo furnirno ploščo (melamin-urea-formalde-hidno lepilo). Vse plošče so bile potopljene v vodo in izpostavljene vlažnim klimatskim pogojem. Določili smo debelinski nabrek, tlačni strig in strižno trdnost. Lastnosti so bile določene 1, 5, 30 in 90 dni po izpostavitvi. Največja sprememba trdnosti je bila ugotovljena pri preskušancih, potopljenih v vodo. Najnižja odpornost proti delovanju vode je bila ugotovljena pri MDF plošči. S SEM slikovno analizo smo prikazali nastanek razpok in porušitve zgradbe gradnikov. Ključne besede: furnirna plošča, OSB, iverna plošča, MDF, tlačni strig, strižna trdnost, voda, vlažna klimaTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaZveza lesarjev Slovenije