Vpliv kakovosti smrekovine na izkoristek osušenega žaganega lesa

diplomsko delo

Marjan Gosar (Author), Dominika Gornik Bučar (Reviewer), Željko Gorišek (Mentor)

Abstract

Čeprav sodi smrekovina med najlaže sušeče se lesne vrste, se posebno v mrzlih zimskih dnevih pojavlja večje število razpok, ki zmanjšujejo kakovost osušenega lesa. Z izvajanjem milejših in ostrejših sušilnih pogojev v pilotski eksperimentalni sušilni komori v jesenskem in zimskem času smo želeli ugotoviti dejavnike, ki so vzrok slabši kakovosti. Kakovost žaganega lesa smo določili na svežem materialu in ga sledili do osušitve na ciljno vlažnost 10 %. Končno kontrolo kakovosti sušenja smo ocenili z določitvijo dosežene končne vlažnosti, vlažnostnega gradienta, številom in velikostjo razpok ter stopnjo veženja in zaskorjenja. Sušenje smrekovine z ostrejšimi pogoji se je pokazalo kot bolj tvegano, saj je nastalo večje število razpok, kot tudi večji vlažnostni gradienti in zaskorjenje. V zimskem času je po sušenju z visokimi temperaturami treba pravilno izvesti tudi ohlajanje, ker lahko hitro in intenzivno ohlajanje vročega lesa privede do dodatnih razpok.

Keywords

les;komorsko sušenje;sušilne napake;kontrola kakovosti;Picea abies Karst.;

Data

Language:	Slovenian
Year of publishing:	2007
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL BF - Biotechnical Faculty
Publisher:	[M. Gosar]
UDC:	630*847.275
COBISS:	1601929
Views:	1363
Downloads:	285
Average score:	0 (0 votes)
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Other data

Secondary language:	English
Secondary title:	Impact od spruce quality on utilization rate of dried sawed wood
Secondary abstract:	Spruce belongs to most easily dried wood species, but nevertheless, larger number of cracks occurs in it, particularly in cold winter days, reducing the quality of dried wood. To find out factors causing worse quality in autumn and winter milder and sharper drying conditions were executed in a pilot experimental drying chamber. The quality of sawed wood was evaluated on fresh material, and followed to dry on target moisture of 10 %. Final control of quality of drying was assessed by designation of the achieved final moisture, moisture gradient, number and size of cracks and degree of warp and casehardening. Drying the spruce with sharper conditions showed as more risked, because a larger number of cracks occurred, so as larger moisture gradients and casehardening. In winter, after drying on high temperatures, unless the hot wood is adequately cooled, additional cracks can emerge.
Secondary keywords:	wood;kiln drying;drying defects;quality control;Picea abies Karst.;
Type (COBISS):	Undergraduate thesis
Thesis comment:	Diplomsko delo, Univ. v Ljubljani, Biotehniška fakulteta, Oddelek za lesarstvo
Pages:	XI, 51 f., [7 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:	21254