Vpliv deleža skorje na mehanske lastnosti ivernih plošč

diplomsko delo - visokošolski strokovni študij

Roman Ščernjavič (Author), Milan Šernek (Reviewer), Sergej Medved (Mentor)

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.

Keywords

iverna plošča;skorja;mehanske lastnosti;

Data

Language:	Slovenian
Year of publishing:	2009
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL BF - Biotechnical Faculty
Publisher:	[R. Ščernjavič]
UDC:	630*862.2
COBISS:	1777545
Views:	1180
Downloads:	301
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	ǂ Theǂimpact of bark share on mechanical properties of particleboard
Secondary 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.
Secondary keywords:	particleboard;bark;mechanical properties;
Type (COBISS):	Undergraduate thesis
Thesis comment:	Univ. v Ljubljani, Biotehniška fakulteta, Odd. za lesarstvo
Pages:	IX, 53 f., [6] f. pril.
Keywords (UDC):	applied sciences;medicine;technology;uporabne znanosti;medicina;tehnika;agriculture and related sciences and techniques;forestry;farming;wildlife exploitation;kmetijstvo ter sorodne vede in tehnologije;forestry;gozdarstvo;forest products and their utilization;gozdni proizvodi in njihova uporaba;
ID:	21729