diplomsko delo
Tadej Dolinar (Author), Marko Petrič (Reviewer), Matjaž Pavlič (Mentor), Sergej Medved (Co-mentor)

Abstract

Ožiganje lesa postaja vedno bolj popularno, v nasprotju s tem pa tehnike za takšno obdelavo lesa v tem času niso napredovale. Z metodo kontaktne termične obdelave smo želeli določiti parametre za doseganje izgleda ožgane površine na lesu. Po obdelavi lesa smo vzorce še dodatno zaščitili z dvema različnima premazoma. Na teh vzorcih smo nato določali barvo pred obsevanjem z UV svetlobo in po njem, odpornost proti udarcem in oprijem premaza. Ožgani vzorci so bili bolj odporni proti barvnim spremembam kot neobdelan les. Pri določanju drugih lastnosti premaza pa so se s stopnjevanjem ožganosti površine poslabševale lastnosti premaza, le na krtačenih vzorcih smo zasledili rahlo poboljšanje. Pri določanju drugih mehanskih lastnosti kot sta mikrotrdota in upogibna trdnost, pa smo dobili nekoliko drugačne rezultate. Pri merjenju mikrotrdote so se v obeh primerih zelo dobro izkazali najbolj ožgani vzorci, medtem ko so le rahlo obdelani vzorci dosegli najslabše rezultate. Pri merjenju upogibne trdnosti pa smo že z zelo kratkim časom izpostavljenosti toploti lesu izboljšali to lastnost. Vendar to velja samo za vzorce, ki so bili v stiskalnici maksimalno pet minut. Po daljšem času obremenitve je les hitro pričel izgubljati upogibno trdnost.

Keywords

ožiganje lesa;termična modifikacija lesa;lastnosti premaznega sistema;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL BF - Biotechnical Faculty
Publisher: [T. Dolinar]
UDC: 630*829.1:842
COBISS: 210028291 Link will open in a new window
Views: 78
Downloads: 42
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Other data

Secondary language: English
Secondary title: Surface charring of wood with contact heat treatment
Secondary abstract: Wood charring is becoming increasingly popular, although the techniques used for this treatment remain rather undeveloped. Using the contact thermal treatment method, we aimed to create the desired parameters for achieving the appearance of a charred surface on the wood using a press. After the wood treatment, the samples were additionally protected with two different coatings. We then measured the colour before and after UV light exposure, impact resistance, and coating adhesion on these samples. The charred samples were more resistant to colour changes than untreated wood. However, in testing other coating properties, the performance of the coating deteriorated with increasing charring of the surface, with only brushed samples showing a slight improvement. In testing other mechanical properties, such as microhardness and bending strength, we obtained somewhat different results. For the microhardness, the most charred samples performed very well in both cases, while the lightly treated samples achieved the poorest results. In the bending strength test, even a very short heat exposure time improved this property in the wood. However, this is true only for samples that were in the press for a maximum of five minutes. After a longer treatment time, the wood quickly began to lose bending strength.
Secondary keywords: wood charring;thermal modification of wood;properties of the coating system;
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 (VII, 45 str.))
ID: 25114631