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Vpliv deleža skorje na mehanske lastnosti ivernih plošč : diplomsko delo - visokošolski strokovni študij
Ščernjavič, Roman (Author), Medved, Sergej (Mentor) More about this mentor... This link opens in a new window, Šernek, Milan (Reviewer)

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Abstract
Raziskovali smo mehanske lastnosti ivernih plošč z različnim deležem skorje. Iverje je bilo iz lesa smreke, jelke in bora, ter skorje macesna, smreke, bora in pinije. Izdelali smo 5 vrst ivernih plošč z deležem skorje 0, 10, 20, 40 in 50 %. Izdelanim ploščam smo določili vsebnost vlage, debelino, gostoto, debelinski nabrek po potopu v vodo, razslojno in upogibno trdnost ter modul elastičnosti. Izvedli smo tudi sejalno analizo iverja lesa in iverja skorje. Ugotovili smo, da je delež večjega iverja večji pri lesu, pri manjših frakcijah pa je ta večji pri skorji. Pri merjenju vlažnosti ivernih plošč smo ugotovili, da so bile razlike v vlažnosti minimalne. Merjenje debeline ivernih plošč je pokazalo, da se je z večanjem deleža skorje v iverni plošči debelina zmanjševala, gostota pa se povečevala. Meritev debelinskega nabreka ivernih plošč po potapljanju v vodi je pokazala, da se z večanjem deleža skorje debelinski nabrek zmanjšuje. Pri merjenju upogibne in razslojne trdnosti smo ugotovili, da je imela iverna plošča z 10 % deležem skorje najvišje vrednosti. Najvišjo vrednost modula elastičnosti pa je imela plošča brez skorje. Modul elastičnosti se je zmanjševal s povečanjem deleža skorje v iverni plošči.

Language:Slovenian
Keywords:iverna plošča, skorja, mehanske lastnosti
Work type:Undergraduate thesis (m5)
Tipology:2.11 - Undergraduate Thesis
Organization:BF - Biotechnical Faculty
Year:2009
Publisher:[R. Ščernjavič]
Number of pages:IX, 53 f., [6] f. pril.
Place:Ljubljana
UDC:630*862.2
COBISS.SI-ID:1777545 This link opens in a new window
Views:970
Downloads:260
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Secondary language

Language:English
Title:The#impact of bark share on mechanical properties of particleboard : graduation thesis - higher professional studies
Abstract:
We have studied the mechanical properties of particleboards with different proportions of bark. Splinter wood was from spruce wood, fir and pine trees, splinter bark was from larch, spruce, pine and stone pine trees. We prepared 5 types of splinter wood boards with bark proportions of 0, 10, 20, 40 and 50 %. We cut out the testing samples from the splinter wood boards, and measured the moisture content, thickness, density, thickness swelling after deluge into the water, layered and bending strength and modulus of elasticity. We also performed separate sowing analysis for splinter wood of timber and splinter wood of bark. It was found out that the proportion of greater splinter wood was greater in the wood, and with smaller fractions the proportion of splinter wood was greater in bark. In measuring the humidity, it was found out that there were minimal differences in the humidity. Measuring the thickness of splinter wood boards showed that by increasing the proportion of bark, the thickness of splinter wood boards was decreasing, and the density increasing. The measurement of thickness swelling, after samples being sunk into water, revealed that by increasing the proportion of bark the thickness swelling was decreasing. Measuring the bending and layer strength showed that the splinter wood board with a 10 % share of bark had the maximum values, however, a board without bark had the maximum value of modulus of elasticity, and by increasing the proportion of bark it was decreasing.

Keywords:particleboard, bark, mechanical properties

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