20.500.12556/RUL-91 Vpliv parametrov toplozračnega sušenja na stopnjo utrjenosti poliuretanskega laka diplomsko delo (visokošolski strokovni študij) Influence of parameters of accelerated air drying on the drying stage of the polyurethane coating graduation thesis (higher professional studies) Stopnja utrjenosti laka na posameznih lesnih elementih, v našem primeru na kuhinjskih vratih, mora biti ravno pravšnja, da prenese obremenitve, katerim so izpostavljeni površinsko obdelani elementi na dnu zložaja. V podjetju Svea Lesna industrija Litija, kjer za površinsko obdelavo kuhinjskih vrat uporabljajo poliuretanski lak, pa je prišlo do zlepljanja lakiranih elementov v 2/3 zložaja; zato smo raziskovali vzroke za nastali problem. V laboratoriju smo spreminjali pogoje sušenja: temperaturo, čas sušenja, hitrost zraka in debelino nanosa. Za vsako kombinacijo parametrov smo določili stopnjo strjenosti laka, to pa smo ugotavljali tudi na vzorcih iz redne proizvodnje in sicer po standardu DIN 53 150. Vsakih 7 dni pa smo na naključnih kuhinjskih vratih merili tudi sijaj, vsega skupaj 21 dni. Po vseh meritvah smo ugotovili, da parametri sušenja močno vplivajo na stopnjo utrjenosti laka, sijaj pa se v tem času bistveno ne spremeni. Menimo, da zlepljanje elementov v zložaju najverjetneje nima vzroka v prenizki stopnji utrjenosti premazov po izhodu iz sušilne linije, temveč je problem najbrž v napakah, ki so povezane z lastnostmi premaza. Drying stage of coatings on finished wooden elements, in our case doors of kitchen elements, is an important property. It must be high enough that the lowest elements in the stack can stand burden of the elements above. In the Svea Lesna Litija company, using a polyurethane varnish, the problem of stackability, appeared for 2/3 doors on the bottom of a stack. We wanted to find out the reasons for the appearance of this defect. The variable parameters in the laboratory research were: temperature, drying time, air speed and layer thickness of the varnish. The drying stage of the lacquered surface was measured for each combination of the parameters, also on the doors taken from regular production. All measurments were performed according to the DIN 53 150 standard. Every 7 days also the gloss of the doors was measured. The random sampling was preformed 3 times. The results of the research showed that the drying parameters have a major influence to the drying stage of the varnish, and practically none to the gloss of the lacquered surface. We believe that the problem of stackability does not originate from a low drying stage of the coating at the end of a finishing line, but rather in various problems, connected to the properties of the coating. površinska obdelava poliuretanski lak stopnja utrjenosti zlepljanje vpliv temperature vpliv hitrosti zraka surface finishing polyurethane coating drying stage stackability temperature influence air speed influence true false false [P. Rozina] Slovenski jezik Angleški jezik Diplomsko delo 2014-07-11 12:24:06 2014-07-11 12:24:06 2022-07-11 10:02:51 0000-00-00 00:00:00 2005 0 Ljubljana 0 VIII, 29 f. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*829.1 1330825 vs_rozina_primoz.pdf vs_rozina_primoz.pdf 1 B25704AA0B94F594582D4DC0C729AE8E d30775303fd32441c50af776fd03d72470cb2cdbd6f814756e56351161ed104d 5469c986-a1b9-11eb-a523-00155dcfd717 20.500.12556/rul/336613fd-ac1f-46bf-9e04-3e496a197ab0 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=132173 Biotehniška fakulteta 0 0 0