Vpliv klimatskih pogojev na delovanje lesa : diplomsko delo - visokošolski strokovni študij

Dovč, Andreja (author), Gorišek, Željko (mentor), Straže, Aleš (reviewer)

Preučevali smo dimenzijsko in oblikovno stabilnost smrekovine in bukovine pri izpostavitvi različnim vlažnostnim obremenitvam: nihajočim klimatskim razmeram med relativnima zračnima vlažnostma 33 % in 87 %, postopnim sušenjem iz svežega stanja do absolutno suhega stanja in različnim ostrinam uravnovešanja. Odzive lesa smo vrednotili z diferencialnim nabrekom in s koeficientom nabrekanja v radialni in tangencialni smeri ter s prečno krčitveno anizotropijo. Pri večkratnem navlaževanju in sušenju smo ugotovili zmanjševanje razlik ravnovesnih vlažnosti,posledično pa so bile vedno manjše tudi dimenzijske spremembe in prečna krčitvena anizotropija. Potrdili smo predpostavko, da nihajoče klimatske razmere nekoliko povečajo dimenzijsko in oblikovno stabilnost lesa.

• Language: Slovenian
• Keywords: les, ravnovesna vlažnost, dimenzijska stabilnost, smrekovina, bukovina
• Work type: Undergraduate thesis
• Typology: 2.11 - Undergraduate Thesis
• Organization: BF - Biotechnical Faculty
• Place of publishing: Ljubljana
• Publisher: [A. Dovč]
• Year: 2013
• Number of pages: VIII, 31 f.
• PID: 20.500.12556/RUL-117608
• UDC: 630*847
• COBISS.SI-ID: 2168201
• Publication date in RUL: 17.07.2020

Secondary language

• Language: English
• Title: Influence of climatic conditions on dimensional stability of wood

Abstract

We have studied the stability of shape and dimensions of spruce wood and beech wood when exposed to various humidity factors: changing climatic conditions with relative humidity ranging between 33 % and 87 %, gradual drying from fresh to completely dry state and different equilibrium parameters. The dimensional changes of wood were evaluated by means of differential swelling and swelling coefficient in radial and tangential direction, and with transverse shrinkage anisotropy. After several repeated wetting and drying procedures it was established that the differences in equilibrium moisture content were reduced, resulting also in smaller dimensional terations and transverse shrinkage anisotropy. We confirmed the assumption that changing climatic conditions somewhat increase the stability of wood in terms of shape and dimensions.

• Keywords: wood, equilibrium moisture content, dimensional stability, spruce wood, beech wood