diplomsko delo
Ambrož Ahec (Author), Željko Gorišek (Reviewer), Aleš Straže (Mentor)

Abstract

Sušenje lesa evkalipta (Eucalyptus nitens) je zahteven postopek, saj je ta vrsta zaradi inherentnih lastnosti zelo dovzetna za sušilne napake. Izvedli smo konvekcijsko komorsko sušenje 27 mm in 47 mm debelih preizkušancev pri temperaturah med 25 °C in 90 °C, pri ravnovesni vlažnosti 16 % ter hitrosti zraka 1 m/s. Kinetiko sušenja ter razvoj sušilnih napak smo kontinuirano spremljali z medicinskim CT-skenerjem z rentgenskimi žarki. Proučevali smo razvoj površinskih razpok ter kolapsa, s pomočjo CT-števila pa smo po Watanabejevi metodi določali lesno vlažnost. S CT-skeniranjem smo potrdili, da počasno sušenje pri nizki temperaturi omili obseg in podaljša čas razvoja kolapsa in površinskih razpok.

Keywords

les;evkalipt;sušenje;sušilne napake;računalniška tomografija;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL BF - Biotechnical Faculty
Publisher: [A. Ahec]
UDC: 630*847
COBISS: 29357571 Link will open in a new window
Views: 257
Downloads: 50
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Other data

Secondary language: English
Secondary title: Use of CT-scanning to analyse convectional kiln drying of wood
Secondary abstract: Drying of eucalyptus (Eucalyptus nitens) is a demanding process, as this species is very susceptible to drying defects due to its inherent properties. We performed convectional kiln drying of 27 mm and 47 mm thick specimens at temperatures between 25 °C and 90 °C, at an equilibrium moisture content of 16 % and an air velocity of 1 m/s. Drying kinetics and the development of drying defects were continuously monitored with a medical X-ray CT scanner. We studied the development of surface checking and collapse, and with the help of CT-number we determined the moisture content of wood according to the Watanabe method. CT scans confirmed that slow drying at low temperature reduce the extent and prolongs the development time of internal cell collapse and surface checking.
Secondary keywords: wood;eucalyptus;drying;drying defects;computer tomography;
Type (COBISS): Bachelor thesis/paper
Study programme: 0
Thesis comment: Univ. v Ljubljani, Biotehniška fak., Oddelek za lesarstvo
Pages: VIII, 37 f.
ID: 12042880