Sublimacijsko sušenje lesa

diplomsko delo - visokošolski strokovni študij

Tomaž Cerar (Author), Dominika Gornik Bučar (Reviewer), Željko Gorišek (Mentor)

Abstract

Sublimacijsko sušenje se uporablja za dehidracijo občutljivih in kemijsko nestabilnih snovi. V lesarstvu je ta tehnika uveljavljena pri sušenju zelo vlažnega arheološkega lesa. Presojali smo možnosti izvajanja sublimacijskega sušenja smrekovine, bukovine in hrastovine z zelo visoko začetno vlažnostjo. V laboratorijskem liofilizatorju smo ugotavljali čas in hitrost sušenja ter ocenili končno kakovost osušenega lesa. Časi sušenja smrekovine in hrastovine so bili krajši od konvencionalnega sušenja. Časi sušenja smrekovine in hrastovine so bili krajši od konvencionalnega sušenja, vendar zaradi zahtevnosti postopka niso izkazovali velike prednosti. Najugodnejši je bil čas sušenja bukovine. Tudi najvišja kakovost sušenja, ki smo jo ocenjevali z vlažnostnim gradientom, stopnjo zaskorjenosti ter pojavom razpok in veženja, je bila dosežena pri bukovini. Na nobeni proučevani lesni vrsti nismo zasledili vpliva postopka na obarvanje.

Keywords

les;sublimacijsko sušenje;kinetika sušenja;kakovost sušenja;

Data

Language:	Slovenian
Year of publishing:	2010
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL BF - Biotechnical Faculty
Publisher:	[T. Cerar]
UDC:	630*847
COBISS:	1840777
Views:	1442
Downloads:	289
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Freeze drying of wood
Secondary abstract:	Freeze or sublimation drying is used for dehydration of chemically sensitive and fragile materials. This technique has been established in the wood industry for drying waterlogged wood. We examined the possibillity of using sublimation drying for spruce, beech and oak with very high initial wood moisture content. In a laboratory lyophilizator, we observed the time and speed of drying and assessed the final quality of dried wood. The drying times of spruce and oak were shorter than with conventional drying, yet the complexity of the procedure did not show substantial benefits. The drying time proved optimum with beech. In addition to this, the quality of drying, which was evaluated with moisture gradient, case hardening, and the initiation of checks and wood twist, was also highest with beech. The impact of drying procedure on wood discoloration was not detected in any wood species studied.
Secondary keywords:	wood;freeze drying;drying kinetics;drying quality;
Type (COBISS):	Undergraduate thesis
Thesis comment:	Univ. v Ljubljani, Biotehniška fak., Oddelek za lesarstvo
Pages:	VIII, 32 f., [8] 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:	21921