Vzroki barvnih sprememb med termično in hidrotermično obdelavo lesa

Kutnar, Andreja (author), Šernek, Milan (author)

Članek obravnava kemijsko zgradbo termično in hidrotermično obdelanega lesa. Predstavljeni so degradacijski in modifikacijski procesi med hidrotermično obdelavo. Opisane so kemijske spremembe lesa, ki vplivajo na izboljšano dimenzijsko stabilnost, znižano ravnovesno vlažnost in izboljšano biološko odpornost hidrotermično obdelanega lesa. Podrobno so opisane kemijske reakcije, ki povzročijo temno barvo hidrotermično obdelanega lesa. Vzroki barvnih sprememb so pojasnjeni z različnih vidikov, ki vključujejo degradacijske procese hemiceluloz, oksidacijske reakcije in polimerizacijske reakcije lignina. Vmesni degradacijski produkti lignina so predstavljeni kot glavni vir barvnih sprememb hidrotermično obdelanega lesa.

• Language: English
• Keywords: wood, hydrothermal treatment, colour, chemical changes, reasons
• Work type: Scientific work
• Typology: 1.02 - Review Article
• Organization: BF - Biotechnical Faculty
• Publisher: Inštitut za gozdno in lesno gospodarstvo
• Year: 2008
• Number of pages: Str. 145-151
• Numbering: Št. 87
• PID: 20.500.12556/RUL-57731
• UDC: 630*81/82=111
• ISSN on article: 0351-3114
• COBISS.SI-ID: 2360742
• Publication date in RUL: 10.07.2015

Record is a part of a journal

• Title: Zbornik gozdarstva in lesarstva. forest and wood science & technology
• Shortened title: Zb. gozd. lesar.
• Publisher: Gozdarski inštitut Slovenije, Biotehniška fakulteta, Oddelek za gozdarstvo in obnovljive gozdne vire, Biotehniška fakulteta, Oddelek za lesarstvo
• ISSN: 0351-3114
• COBISS.SI-ID: 6206978

Secondary language

• Language: Slovenian
• Title: Reasons for colour changes during thermal and hydrothermal treatment of wood

Abstract

The chemical composition of wood in relation to its thermal and hydrothermal treatment is discussed. The degradation and modification processes, which take place during hydrothermal treatment, are presented. The chemical reasons for the increased dimensional stability, reduced moisture content and improved biological durability of hydrothermally treated wood are given. Particular attention is given to the chemical reactions that can cause the darker tonality of hydrothermally treated wood. The literature review of chemical explanations for wood colour changes ranges from the degradation of hemicelluloses through oxidation reactions to lignin polymerization reactions. Intermediate lignin degradation products are considered to be the main source of colour changes in hydrothermally treated wood.

• Keywords: les, hidrotermična obdelava, barve, kemijske spremembe, vzroki