Lastnosti ivernih plošč iz termično modificiranega lesa : diplomsko delo - univerzitetni študij

Jazbec, Jernej (author), Medved, Sergej (mentor), Pohleven, Franc (reviewer)

Termično modificiran les je dimenzijsko obstojnejši, vendar so mehanske lastnosti slabše. Zaradi boljše dimenzijske obstojnosti pa je lahko termično modificiran les primeren za izdelavo iveri in iverne plošče, pri katerih so sorpcijske lastnosti največja pomankljivost. Izdelali smo štiri plošče z različno vsebnostjo termično modificiranega lesa 0, 30, 60 in 100 (%). Ugotavljali smo čvrstost površine, razslojno, upogibno trdnost, debelinski nabrek ter gostoto in vsebnost vlage. Povprečne gostote med ploščami se ne razlikujejo veliko. Debelinski nabrek in vsebnost vlage sta bila najnižja ugotovljena pri iverni plošči s 100 % deležem iverja termično modificiranega lesa. Lastnosti kot so upogibna in razslojna trdnost ter čvrstost površine so bile najvišje pri kontrolni plošči ( 0 % iverja termično modificiranega lesa), kar je bilo pričakovano, saj je termično modificiran les mehansko oslabljen. Modul elastičnosti je bil največji pri iverni plošči, izdelani iz 100 % iverja termično modificiranega lesa, kar nas je presenetilo.

• Language: Slovenian
• Keywords: termično modificiran les, iverna plošča, mehanske lastnosti
• Work type: Undergraduate thesis
• Typology: 2.11 - Undergraduate Thesis
• Organization: BF - Biotechnical Faculty
• Place of publishing: Ljubljana
• Publisher: [J. Jazbec]
• Year: 2013
• Number of pages: IX, 41 f.
• PID: 20.500.12556/RUL-117569
• UDC: 630*862.2
• COBISS.SI-ID: 2145929
• Publication date in RUL: 16.07.2020

Secondary language

• Language: English
• Title: Properties of particleboards from thermally modified wood

Abstract

Thermally modified wood is more dimensionally-lasting; that is why its mechanical properties are worse. Because of its reduced sorption characteristics the thermally modified timber is more suitable because of its better dimensional stability when used as a raw material for the production of particles and particleboards. We produced 4 plates with different proportions of thermally modified wood 0, 30, 60, 100 (%). We determined the strength surface perpendicular to the board, internal bonding (IB), bending strength, modulus of rapture, thickness swelling (TS), density and moisture content (MC). The average density among the plates does not differ much. TS and MC were the lowest in the particle board with 100 % of thermally modified wood particles. Properties such as bending strength, IB and the strenght of surface perpendicular to the board were the highest in the panel without particles of thermally modified wood (0%), which was expected; the thermally modified wood being mechanically weakened. Unexpectedly, the modulus of elasticity was the largest in the particle board with 100 % of thermally modified wood particles.

• Keywords: thermally modified wood, particleboard, mechanical properties