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POVRŠINSKO OŽIGANJE LESA S KONTAKTNO TERMIČNO OBDELAVO
ID Dolinar, Tadej (Author), ID Pavlič, Matjaž (Mentor) More about this mentor... This link opens in a new window, ID Medved, Sergej (Comentor)

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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.

Language:Slovenian
Keywords:ožiganje lesa, termična modifikacija lesa, lastnosti premaznega sistema
Work type:Bachelor thesis/paper
Organization:BF - Biotechnical Faculty
Year:2024
PID:20.500.12556/RUL-162314 This link opens in a new window
Publication date in RUL:21.09.2024
Views:53
Downloads:8
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Secondary language

Language:English
Title:SURFACE CHARRING OF WOOD WITH CONTACT HEAT TREATMENT
Abstract:
Wood charring is becoming increasingly popular; however, techniques for such wood treatment have not advanced during this time. Using the contact thermal treatment method, we aimed to create the desired parameters for achieving the appearance of a charred surface. 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 slight improvement. In testing other mechanical properties, such as microhardness and bending strength, we obtained somewhat different results. For microhardness determination, 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 longer treatment time, the wood quickly began to lose bending strength.

Keywords:wood charring, thermal modification of wood, properties of the coating system

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