diplomsko delo
Žiga Končan (Author), Boštjan Lesar (Reviewer), Miha Humar (Mentor), Nejc Thaler (Co-mentor)

Abstract

Zaradi velikih količin manj vrednega pomodrelega lesa,nas zanima, ali lahko takemu lesu dvignemo dodano vrednost s postopkom termične modifikacije. Pomodrele in kontrolne vzorce smrekovine smo modificirali pri dveh temperaturah in na njih izvedli več testov. Zanimala nas je izguba mase po modifikaciji, sprememba barve, tlačna trdnost, upogibna trdnost, stični kot, kratkotrajni in dolgotrajni navzem tekoče vode ter sorpcijske lastnosti. Testi so pokazali, da ima modificiran pomodrel les malo slabše mehanske lastnosti kot nepomodrel. Vse ostale, za termično modificiran les bolj pomembne lastnosti, pa so se izboljšale. Stični kot se je pomodrelim vzorcem po termični modifikaciji znatno povečal, na kontrolne vzorce pa ni imel bistvenega vpliva. Na kratkotrajni in dolgotrajni navzem vode je imela termična modifikacija velik vpliv. Navzem pomodrelih in kontrolnih vzorcev se je zmanjšal na primerljivo vrednost. Termična modifikacija je izboljšala tudi sorpcijske lastnosti; ravnovesna vlažnost vseh vzorcev je padla, povečala pa se je tudi sposobnost oddajanja vlage oz. sušenja. Celotna serija poskusov nam je pokazala, da lahko s termično modifikacijo pomodrel les znatno izboljšamo in mu tako dvignemo dodano vrednost.

Keywords

smreka;termična modifikacija;glive modrivke;pomodrel les;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL BF - Biotechnical Faculty
Publisher: [Ž. Končan]
UDC: 630*84
COBISS: 2813577 Link will open in a new window
Views: 1161
Downloads: 257
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Other data

Secondary language: English
Secondary title: Thermal modification of bark beetle damaged spruce wood
Secondary abstract: Due to large quantities of blue stained wood with low market value, we aimed to determine whether we can increase its market value with the process of thermal modification. Blue stained and control samples were thermally modified at two different temperatures. A series of tests were then performed. Mass loss, colour change, compressive strength, bending strength, contact angle, short-term and long-term liquid water uptake, and sorption properties were determined. Results have shown that thermally modified wood has deteriorated mechanical properties, but all the other properties have improved with the process of thermal modification. Thermal modification significantly improved contact angle of blue stained specimens, whereas control specimens remained more or less the same. Same goes for short-term and long-term water uptake, both of which performed poorly prior to thermal modification compared to control specimens. Thermal modification improved the blue stained specimens to the point, where the results were comparable to control specimens. Equilibrium moisture content of all thermally modified specimens decreased. Drying velocity was also improved by thermal modification. The series of the performed tests showed that it is possible to improve blue stained wood's properties with thermal modification and therefore greatly increasing its market value.
Secondary keywords: spruce;thermal modification;blue stain fungi;blue stained wood;
Type (COBISS): Bachelor thesis/paper
Study programme: 0
Thesis comment: Univ. v Ljubljani, Biotehniška fak., Oddelek za lesarstvo
Pages: VIII, 39 f.
ID: 10910367