20.500.12556/RUL-158848 Natezna trdnost prostih filmov lesnih premazov diplomsko delo Tensile strength of free films of wood coatings B. Sc. thesis Lesni premazi zaščitijo podlago pred zunanjimi dejavniki in ji hkrati dajo tudi lep estetski videz. Utrjeni filmi premazov morajo slediti dilatacijam in krčenju podlage, zato morajo biti dovolj prožni. Da bi ugotovili, kakšne so sposobnosti prilagajanja premazov na dimenzijske spremembe podlage, smo preskušali natezno trdnost prostih filmov lesnih premazov. Izbrali smo 10 različnih premaznih sredstev in 8 različnih podlag za nanos premaznih sredstev. Po končanem preskušanju nanosa premaznih sredstev na različne podlage so rezultati pokazali, da se filmi najbolje tvorijo na teflonskih in polipropilenskih ploščah, s katerih jih je tudi najlažje odstraniti. Zato smo z ročnim nanašalcem premaze nanesli na plošče iz teflona in polipropilena dolžine pribl. 500 mm skozi režo 240 %m. Tvorjene filme smo najprej odstranili s podlage in tako razrezali v preskušance. Nato smo ocenili njihovo prožnost. Meritve smo izvedli z napravo Zwick Roell Z005. Preskusili smo po 10 vzorcev vsakega premaza. Filme smo raztezali pri različnih hitrostih vse do pretrga premaza. Ugotovili smo, da so premazi za zunanjo uporabo bolj prožni, vendar mehkejši. Po drugi strani so premazi za notranjo uporabo trši in mnogo manj prožni. Wood coatings protect the wooden substrate against external exposure factors as well as improve the aesthetic view of the object. Cured coating films need to be stretchable in order to follow substrate dilatations and shrinkage. To investigate the adaptation ability of coatings to dimensional changes of a substrate, we tested the tensile strength of free films of wood coatings. 10 different coatings and 8 different substrates for application of coating films were selected. Testing of the substrates for application and removal ability of free coating films resulted in selection of two suitable materials, teflon and polypropylene. We manually applied the coatings on 500 mm long teflon and polypropylene plates trough the applicator slot of 240 %m. The films were firstly removed from the plates and then they were cut into the samples. Afterwards their elasticity was evaluated. The measurements were performed with a device Zwick Roell Z005, with 10 samples per each coating. The films were stretched by different speed until the breaking point. We have concluded that the coatings for outdoor use are more elastic than the coatings for internal use, however they are softer. On the other hand, the coatings for indoor applications are less flexible and harder. zaščita lesa lesni premazi prosti filmi natezna trdnost wood protection coatings free films tensile strength true false false B. Černe Slovenski jezik Angleški jezik Diplomsko delo/naloga 2024-06-21 11:16:31 2024-06-21 11:16:36 2024-07-05 03:38:07 0000-00-00 00:00:00 2016 0 Ljubljana 2016 Ljubljana IX, 37 f., [10] f. pril. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 674.07 2697609 DIP_Cerne_Blaz_2016.pdf DIP_Cerne_Blaz_2016.pdf 1 6FC419E0F4ABF7EE3FB4E7366494E528 5af7725ca7a2237be4c1b12de1c974bdb21ee49643820fe51e7e11e1116fc3d9 f70a5461-2fae-11ef-a25b-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=186577 Biotehniška fakulteta 0 0 0