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Vpliv parametrov toplozračnega sušenja na stopnjo utrjenosti poliuretanskega laka : diplomsko delo (visokošolski strokovni študij)
Rozina, Primož (Author), Petrič, Marko (Mentor) More about this mentor... This link opens in a new window, Šernek, Milan (Reviewer)

URLURL - Presentation file, Visit http://www.digitalna-knjiznica.bf.uni-lj.si/vs_rozina_primoz.pdf New window

Abstract
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.

Language:Slovenian
Keywords:površinska obdelava, poliuretanski lak, stopnja utrjenosti, zlepljanje, vpliv temperature, vpliv hitrosti zraka
Work type:Undergraduate thesis (m5)
Tipology:2.11 - Undergraduate Thesis
Organization:BF - Biotechnical Faculty
Year:2005
Publisher:[P. Rozina]
Number of pages:VIII, 29 f.
Place:Ljubljana
UDC:630*829.1
COBISS.SI-ID:1330825 Link is opened in a new window
Views:608
Downloads:127
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Secondary language

Language:English
Abstract:
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.

Keywords:surface finishing, polyurethane coating, drying stage, stackability, temperature influence, air speed influence

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