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Proučevanje nabrekanja termično modificiranega lepljenega kuhinjskega pulta in njegove odpornosti proti modrenju : diplomsko delo - univerzitetni študij
Vravnek, Boris (Author), Pohleven, Franc (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_vravnek_boris.pdf This link opens in a new window

Abstract
Les je zelo nagnjen k krčenju in nabrekanju. Da bi ga ustrezno stabilizirali, smo ga termično modificirali. Ugotavljali smo, kako vpliva termična modifikacija na dimenzijsko stabilnost in odpornost proti glivam modrivkam. Modifikacijo hrastovega in bukovega pulta smo opravili v vakuumu pri temperaturi 170 °C in 200 °C. V prvem primeru smo modificirali že zlepljen pult, v drugem pa elemente lesa, ki smo jih kasneje zlepili v pult. Dimenzijsko stabilnost smo preizkušali tako, da smo vzorce namakali v vodi in nato spremljali nabrekanje. Za ocenjevanje odpornosti proti glivam modrivkam smo uporabili standardizirano metodo SIST EN 152. Ugotovili smo, da termična modifikacija poveča dimenzijsko stabilnost lesa že pri 170 °C, še izraziteje pa pri 200 °C. Večjo dimenzijsko stabilnost smo ugotovili pri kasneje zlepljenih pultih. Modifikacija je povečala odpornost pulta proti glivam modrivkam. Pri hrastu je bila bolj učinkovita, saj je preprečila pomodrelost že pri 170 °C, pri bukovini pa se je odpornost na modrivke pokazala pri temperaturi modifikacije 200 °C.

Language:Slovenian
Keywords:modifikacija lesa, dimenzijska stabilnost, glive modrivke
Work type:Undergraduate thesis (m5)
Tipology:2.11 - Undergraduate Thesis
Organization:BF - Biotechnical Faculty
Year:2010
Publisher:[B. Vravnek]
Number of pages:X, 42 f.
Place:Ljubljana
UDC:630*841.1
COBISS.SI-ID:1803913 Link is opened in a new window
Views:582
Downloads:181
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Secondary language

Language:English
Abstract:
Wood is very vulnerable to shrinkage and swelling. To stabilise it accordingly, we have modified it thermally. We wished to determine the impact of thermal modification on the dimensional stability and resistance to blue stain fungi. Modification of oak and beech panel was performed in a vacuum at a temperature of 170 °C and 200 °C. In 1st case, we modified a previously glued panel. In 2nd case, we modified the wooden elements and glued them together subsequently. Dimensional stability was tested by soaking the samples in water and monitoring the swelling. To assess resistance to blue stain fungi we used a standardised method SIST EN 152. We established that thermal modification increased the dimensional stability of wood already at 170 °C, but even more explicitly at 200 °C. Greater dimensional stability was observed in panels glued together later. The modification increased the resistance of panels against blue stain fungi. In the case of oak wood, it was more effective as it prevented blue staining already at 170 °C, and in the case of beech wood, the resistance to blue stain fungi was indicated at 200 °C.

Keywords:wood modification, dimensional stability, blue stain fungi

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