Sušilne lastnosti kompresijskega lesa

diplomsko delo

Tomo Strle (Author), Katarina Čufar (Reviewer), Željko Gorišek (Mentor)

Abstract

Ugotavljali smo razlike v fizikalnih lastnostih normalnega in kompresijskega lesa smreke (Picea abies Karst.). Gostota kompresijskega lesa je bila nekoliko večja, volumenski, radialni in tangencialni skrčki pa so bili za polovico manjši kot pri normalnem lesu. Krčenje kompresijskega lesa v vzdolžni smeri je bilo kar 6x večje kot pri normalnem. Naše raziskave so potrdile znatne razlike v sušilnih lastnostih normalnega in kompresijskega lesa. Pri kompresijskem smo izmerili nekoliko manjšo prepustnost za pline v prečnih smereh in 6x manjšo prepustnost za pline v smeri vlaken. Kompresijski les se v higroskopnem območju počasnejše suši, ima pa tudi manjši difuzijski koeficient, merjen v radialni smeri.

Keywords

les;kompresijski les;sušenje;krčenje;dimenzijska stabilnost;difuzivnost;permeabilnost;Picea abies Karst.;

Data

Language:	Slovenian
Year of publishing:	2008
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL BF - Biotechnical Faculty
Publisher:	[T. Strle]
UDC:	630*847
COBISS:	1659273
Views:	1124
Downloads:	262
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Drying characteristics of compression wood
Secondary abstract:	Differences in physical properties of normal and compression wood of spruce (Picea abies Karst.) were studied. The density of compression wood compared to the normal was slightly higher. The volume, radial and tangential shrinkage of compression wood with respect to the normal wood was half smaller, while shrinkage in longitudinal direction was 6x greater than that of the normal wood. Our research confirmed also a significant difference in drying characteristics of normal and compression wood. Compression wood, compared to normal secondary xylem of spruce, has slightly lower gas permeability in transverse direction, and more than 6x lower gas permeability in fiber direction. Slower drying of compression wood in hygroscopic range was also confirmed, as well as lower diffusion coefficient measured in radial direction.
Secondary keywords:	wood;compression wood;drying;shrinkage;dimensional stability;diffusivity;permeability;Picea abies Karst.;
Type (COBISS):	Undergraduate thesis
Thesis comment:	Univ. v Ljubljani, Biotehniška fakulteta, Odd. za lesarstvo
Pages:	IX, 41 f.
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:	21408