diplomsko delo
Jan Žalik (Author), Boštjan Lesar (Reviewer), Miha Humar (Mentor)

Abstract

Diplomsko delo raziskuje uporabo UV, IR in CO2 laserjev za odstranjevanje utrjenih filmov različnih premazov s površin bukovega in hrastovega lesa. Cilj naloge je bil poiskati ustrezne parametre za učinkovito odstranjevanje premazov in s pomočjo analize z digitalnim ter konfokalnim mikroskopom oceniti kakovost površine lesa po laserski obdelavi. Rezultati so pokazali, da je izbira laserja, njegove moči in števila prehodov ključna za uspešno odstranitev premazov ob zagotavljanju ustrezne kakovosti podlage za njeno nadaljnjo obdelavo po odstranitvi. UV laser je omogočil natančnejše odstranjevanje premazov brez večjih poškodb lesne podlage. IR laser se je izkazal kot manj učinkovit pri odstranjevanju transparentnih premazov, medtem ko je pri črno pigmentiranem pokazal učinkovitost že pri nizkih močeh. CO2 laser je bil učinkovit pri odstranjevanju večine premazov, vendar je pri tem bolj povzročal lokalne ožganine podlage. Lasersko odstranjevanje premazov s površin bukovega lesa je bilo bolj učinkovito, površina lesa po odstranitvi premaza pa je bila tudi bolj gladka. Prav tako smo dokazali, da na učinkovitost odstranjevanja filmov laka pomembno vpliva tudi vrsta premaza oz. premaznega sistema. Transparentni poliuretanski premaz na organski osnovi se je enakomerneje odstranjeval s površine lesa kot akrilni na vodni osnovi. Izsledki raziskave predstavljajo pomembno osnovo za nadaljnjo optimizacijo procesov laserskega odstranjevanja premazov.

Keywords

odpornost;les;razkroj;izpostavitev na prostem;vlažnost lesa;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL BF - Biotechnical Faculty
Publisher: [J. Žalik]
UDC: 630*841.4:814.1
COBISS: 209986819 Link will open in a new window
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Downloads: 31
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Other data

Secondary language: English
Secondary title: Performance of claddings made of selected softwoods after seven years of outdoor exposure
Secondary abstract: The importance of wooden façades is increasing, as people seek a natural appearance for their homes and are increasingly avoiding synthetic materials. At the same time, due to the high costs and time-consuming maintenance associated with wood protection coatings, there is a growing trend to avoid such treatments. In Slovenia, coniferous wood, primarily spruce and larch, is predominantly used for façade construction. The aim of this diploma thesis was to compare the key properties of common spruce, heartwood of European larch, sapwood of Scots pine, and heartwood of Scots pine after seven years of outdoor exposure. In the thesis, we report and analyse which wood species are used for wooden façades in Slovenia and whether it is possible to use alternative species, such as pine wood, for this purpose. We were interested in how the properties of the selected coniferous wood species affect their suitability for outdoor use without protection. The work began with the documentation and preparation of samples of the selected wood species, which were exposed outdoors for seven years. We analysed the dynamics of wood wetting and drying over a seven-year period, and determined the density, compressive strength, colour, roughness, contact angle, and visual assessment of decay after seven years of outdoor exposure. After analysing the data, we found that spruce wood, larch wood, and pine wood performed well after seven years of exposure, but unprotected pine sapwood is not suitable for outdoor use.
Secondary keywords: resistance;wood;decay;outdoor exposure;wetting;
Type (COBISS): Bachelor thesis/paper
Study programme: 0
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. v Ljubljani, Biotehniška fak., Oddelek za lesarstvo
Pages: 1 spletni vir (1 datoteka PDF (IX, 50 str.))
ID: 25096023