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Relaksacija sušilnih napetosti v nihajočih klimatskih pogojih : diplomski projekt
ID Štigl, Dušan (Author), ID Gorišek, Željko (Mentor) More about this mentor... This link opens in a new window, ID Straže, Aleš (Reviewer)

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Abstract
Sušenje v standardnih klimatskih pogojih je problematično zaradi pojava možnega zaskorjenja na koncu sušenja. Z vpeljavo sušenja v oscilirajočih klimatskih pogojih smo poskušali ugotoviti vpliv le-teh na izboljšanje kakovosti osušenega lesa. Oba postopka smo primerjali z intervalnim odvzemanjem vzorcev. Merili smo povprečno vlažnost, vlažnostni gradient, zaskorjenje in ugotavljali mehanske lastnosti lesa v sredinskih in površinskih slojih. Povprečna vlažnost osušenega lesa je bila v standardnih klimatskih pogojih nižja kot pri sušenju v oscilirajočih klimatskih pogojih. Vlažnostni gradient je bil v oscilirajočih klimatskih pogojih manjši kot pri sušenju v standardnih klimatskih pogojih. Pri sušenju v oscilirajočih klimatskih pogojih je bilo zaskorjenje zunanjih slojev lesa na koncu sušenja manjše kot pri sušenju v standardnih klimatskih pogojih. Mehanske lastnosti so bile pri sušenju v standardni klimi boljše kot pri sušenju v oscilirajočih klimatskih pogojih.

Language:Slovenian
Keywords:sušenje lesa, oscilirajoča klima, vlažnostni gradient, mehanske lastnosti
Work type:Diploma project paper
Typology:2.11 - Undergraduate Thesis
Organization:BF - Biotechnical Faculty
Place of publishing:Ljubljana
Publisher:D. Štigl
Year:2011
Number of pages:VI, 32 f.
PID:20.500.12556/RUL-159188 This link opens in a new window
UDC:630*847.2
COBISS.SI-ID:1962889 This link opens in a new window
Publication date in RUL:02.07.2024
Views:89
Downloads:1
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Secondary language

Language:English
Title:Relaxation of drying stresses during oscillated drying conditions : B. Sc. thesis
Abstract:
Drying at standard conditions is problematic due to the emergence of a strong casehardening at the end of drying, especially in species with large shrinkage. By bringing in the oscillatory drying climatic conditions, we tried to determine the effect of these on improving the quality of dried wood. Both procedures were compared by intermittent removal of samples. We measured the average moisture content, moisture gradient and casehardening; then the mechanical properties of the wood in the middle and on the surface layers were identified. The final average moisture content of wood dried in standard climatic conditions was lower than that in the oscillating process; while moisture gradient was greater. Casehardening of outer wood layers at the end of oscillated drying was lower than that at the standard air drying conditions. Mechanical properties at drying in standard climatic conditions were better than those in oscillatory conditions.

Keywords:wood drying, oscilating schedule, moisture content, mechnaical properties

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