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Vpliv toplotne obdelave na sorpcijske lastnosti lesa
Gorišek, Željko (Author), Straže, Aleš (Author), Jene, Robert (Author)

URLURL - Presentation file, Visit http://www.dlib.si/details/URN:NBN:SI:DOC-TM7ANUDN This link opens in a new window

Abstract
Delovanje lesa v nihajočih klimatskih razmerah je odvisno tudi od njegovih sorpcijskih lastnosti, ki se med predelavo in obdelavo lesa lahko spreminjajo.S simulacijo termične obdelave lesa pri treh temperaturah (T1 = 20°C, T2 = 100 °C in T3 = 180 °C) in z dvema trajanjema pregrevanja (t1 = 5 min. in t2 = 10 min.) smo proučevali njihov vpliv na sorpcijske karakteristike, kot se odražajo v doseganju ravnovesnih vlažnosti v postopkih desorpcije in adsorpcije na petih stopnjah relativne zračne vlažnosti (j1 = 20%, j2 = 33 %, j3 = 44 %, j4 = 65 % in j5 = 88 %). Poleg razlik med adsorpcijo in desorpcijo se je kot statistično značilni dejavnik na celotnem higroskopskem območju izkazala še temperatura, pri visokih vlažnostih pa tudi čas, začetna vlažnost in nekatere interakcije. Sorpcijske izoterme so bile prilagojene tudi matematičnemu modelu (Dent, BTE, GAB).

Language:Slovenian
Keywords:ravnovesna vlažnost lesa, sorpcijske izoterma in histereza, toplotna obdelava, modeli sorpcije
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:BF - Biotechnical Faculty
Year:2004
Publisher:Zveza društev inženirjev in tehnikov gozdarstva in lesarstva Slovenije
Number of pages:str. 140-147
Numbering:Let. 56, št. 5
UDC:630*812.210
ISSN on article:0024-1067
COBISS.SI-ID:1182089 Link is opened in a new window
Views:601
Downloads:135
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Record is a part of a journal

Title:Les
Shortened title:Les
Publisher:Zveza društev inženirjev in tehnikov gozdarstva in lesarstva Slovenije, Zveza društev inženirjev in tehnikov gozdarstva in lesarstva Slovenije, Biotehniška fakulteta, Oddelek za lesarstvo
ISSN:0024-1067
COBISS.SI-ID:13940224 This link opens in a new window

Secondary language

Language:Slovenian
Title:Effect of thermal treatment on sorption characteristic of wood
Abstract:
Shrinkage and swelling of wood in changing climate conditions depends on their sorption characteristics. This can be changed during different processes and treatments. The influence of temperature on tree levels (T1 = 20 °C, T2 = 100 °C in T3 = 180 °C) and two different times (t1 = 5 min. in t2 = 10 min.) of treatment on equilibrium moisture content (EMC) of wood during desorption and adsorption process at five level of relative humidity (j1 = 20 %, j2 = 33 %, j3 = 44 %, j4 = 65 % in j5 = 88 %) were examined. Sorption capacity decreased as temperature increased in all humidity range and at the higher level of humidity also other parameters and their interaction were statistically significant. Dent model of sorption isotherms was fitted to experimental data

Keywords:equilibrium moisture content, sorption isotherms and hysteresis, thermal treatment, sorption models

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