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Quality control of thermally modified timber using dynamic vapor sorption (DVS) analysis
ID
Humar, Miha
(
Author
),
ID
Repič, Rožle
(
Author
),
ID
Kržišnik, Davor
(
Author
),
ID
Lesar, Boštjan
(
Author
),
ID
Cerc Korošec, Romana
(
Author
),
ID
Brischke, Christian
(
Author
),
ID
Emmerich, Lukas
(
Author
),
ID
Rep, Gregor
(
Author
)
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MD5: F131EE4375B46DE2C4EAC791DF00F915
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https://www.mdpi.com/1999-4907/11/6/666
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Abstract
The importance of thermal modification is increasing worldwide. Increased use of thermally modified timber (TMT) has resulted in a need for reliable quality control, comprising control of variation of the production within defined limits, allowing third-party control in the case of certification and the regulation of customer complaints and claims. Techniques are thus needed to characterise the modification of quality in terms of improved target properties of TMT during industrial production, and of TMT products that have been in service for an arbitrary time. In this study, we aimed to utilise dynamic vapor sorption (DVS) for this purpose. Norway spruce (Picea abies) and European beech (Fagus sylvatica) samples were thermally modified at different temperatures according to different heat treatment techniques: (1) the Silvapro process based on an initial vacuum; (2) an air heat treatment, whereby samples were wrapped in aluminium foil; (3) thermal modification of wood samples in the ambient atmosphere in a laboratory oven. Wood samples from closed processes were analysed for validation. TMT was characterised with respect to mass loss, colour and density. Mass loss of wood due to modification (ML$_{TM}$) was correlated with factors derived from DVS analysis. The present DVS measurements suggest that the equilibrium wood moisture content (EMC$_{95\%}$ $_{RH}$), the time to reach 10% wood moisture content (t$_{10\%}$ $_{MC}$), and the elongation factor, c, derived from a logarithmic function, can serve as alternative parameters to characterise the quality of several thermal modification processes. Further studies are recommended using other wood species, different modification processes and further parameters gained from DVS measurements to understand the robustness and the predictive power of the applied technique.
Language:
English
Keywords:
thermal modification
,
quality control
,
dynamic vapour sorption
,
wood
,
moisture content
Work type:
Article
Typology:
1.01 - Original Scientific Article
Organization:
BF - Biotechnical Faculty
FKKT - Faculty of Chemistry and Chemical Technology
Publication status:
Published
Publication version:
Version of Record
Year:
2020
Number of pages:
12 str.
Numbering:
Vol. 11, iss. 6, art. 666
PID:
20.500.12556/RUL-133934
UDC:
630*8
ISSN on article:
1999-4907
DOI:
10.3390/f11060666
COBISS.SI-ID:
19360259
Publication date in RUL:
20.12.2021
Views:
784
Downloads:
158
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Record is a part of a journal
Title:
Forests
Shortened title:
Forests
Publisher:
MDPI
ISSN:
1999-4907
COBISS.SI-ID:
3872166
Licences
License:
CC BY 4.0, Creative Commons Attribution 4.0 International
Link:
http://creativecommons.org/licenses/by/4.0/
Description:
This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:
11.06.2020
Secondary language
Language:
Slovenian
Keywords:
termična modifikacija
,
kontrola kakovosti
,
dinamična sorpcija vodne pare
,
les
,
vlažnost lesa
Projects
Funder:
ARRS - Slovenian Research Agency
Project number:
L4-7547
Name:
Obnašanje lesa in lignoceluloznih kompozitov v zunanjih pogojih
Funder:
ARRS - Slovenian Research Agency
Project number:
P4-0015
Name:
Les in lignocelulozni kompoziti
Funder:
ARRS - Slovenian Research Agency
Funding programme:
Infrastructural centre
Project number:
0481-09
Acronym:
IC LES PST
Funder:
Other - Other funder or multiple funders
Project number:
C3330-16-529003
Name:
Sustainable and Innovative Construction of Smart Buildings
Acronym:
TIGR4smart
Funder:
Other - Other funder or multiple funders
Project number:
OP20.03520
Name:
Wood Products over a Lifetime
Acronym:
WOOLF
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