Experimental Analysis of Mass Loss Kinetics During Heat Treatment of Wood

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43410%2F20%3A43918173" target="_blank" >RIV/62156489:43410/20:43918173 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.swst.org/wp/wp-content/uploads/2020/07/SWST-2020-Proceedings-Final-final-final.pdf" target="_blank" >http://www.swst.org/wp/wp-content/uploads/2020/07/SWST-2020-Proceedings-Final-final-final.pdf</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Experimental Analysis of Mass Loss Kinetics During Heat Treatment of Wood

Popis výsledku v původním jazyce

The mass loss kinetics during heat treatment of selected wood species was experimentally analyzed. European beech (Fagus sylvatica L.), English oak (Quercus robur L.), Norwegian spruce (Picea abies L. Karst.) and Scots pine (Pinus sylvestris L.) wood specimens were heat treated at 140oC, 160oC, 180oC, 200oC and 220oC for 1 to 6 hours using atmospheric pressure and superheated steam environment. The process intensity was determined by mass loss (ML), based on oven-dry mass before and after the heat treatment. Furthermore, the equilibrium moisture content (EMC) was determined before and after heat treatment to analyze the effect of mass loss on the sorption properties. For the studied wood species, the ML was found to be less than 1-1.5% when temperature of 140oC and 160oC was applied. Differences between studied species were more significant at temperatures higher than 160oC. At higher temperature (220oC) a mass loss attained of 13.5% (beech), 18.8% (oak), 6.7% (spruce) and 13.5% (pine). The EMC was reduced after heat treatment within the range of 4 - 48%, 0.4 - 47%, 1 - 32% and 0.7 - 40% for beech, oak, spruce and pine, respectively. The reason for the decrease of the EMC is that less water is absorbed by the cell wall after the heat treatment as a result of chemical compounds degradation with a decrease of hydroxyl (OH-) groups. Further, the EMC correlates exponentially (R2=0.91-0.95) with the decrease of specimens&apos; mass depending on the used wood species and modification temperature applied. This study provides experimental mass loss results of various heat treated wood species and obtained data can be used for heat treatment process optimization as well as for the modeling and prediction of the mass loss and required material properties (EMC) for designed wooden products.

Název v anglickém jazyce

Experimental Analysis of Mass Loss Kinetics During Heat Treatment of Wood

Popis výsledku anglicky

The mass loss kinetics during heat treatment of selected wood species was experimentally analyzed. European beech (Fagus sylvatica L.), English oak (Quercus robur L.), Norwegian spruce (Picea abies L. Karst.) and Scots pine (Pinus sylvestris L.) wood specimens were heat treated at 140oC, 160oC, 180oC, 200oC and 220oC for 1 to 6 hours using atmospheric pressure and superheated steam environment. The process intensity was determined by mass loss (ML), based on oven-dry mass before and after the heat treatment. Furthermore, the equilibrium moisture content (EMC) was determined before and after heat treatment to analyze the effect of mass loss on the sorption properties. For the studied wood species, the ML was found to be less than 1-1.5% when temperature of 140oC and 160oC was applied. Differences between studied species were more significant at temperatures higher than 160oC. At higher temperature (220oC) a mass loss attained of 13.5% (beech), 18.8% (oak), 6.7% (spruce) and 13.5% (pine). The EMC was reduced after heat treatment within the range of 4 - 48%, 0.4 - 47%, 1 - 32% and 0.7 - 40% for beech, oak, spruce and pine, respectively. The reason for the decrease of the EMC is that less water is absorbed by the cell wall after the heat treatment as a result of chemical compounds degradation with a decrease of hydroxyl (OH-) groups. Further, the EMC correlates exponentially (R2=0.91-0.95) with the decrease of specimens&apos; mass depending on the used wood species and modification temperature applied. This study provides experimental mass loss results of various heat treated wood species and obtained data can be used for heat treatment process optimization as well as for the modeling and prediction of the mass loss and required material properties (EMC) for designed wooden products.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20502 - Paper and wood

Projekt

<a href="/cs/project/GJ19-25171Y" target="_blank" >GJ19-25171Y: Hygro-termo-mechanické chování modifikovaných materiálů na bázi dřeva na různých úrovních pozorování</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Proceedings of the 2020 Society of Wood Science and Technology International Convention

ISBN

978-1-73404-850-6

ISSN

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e-ISSN

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Počet stran výsledku

7

Strana od-do

516-522

Název nakladatele

Society of Wood Science and Technology

Místo vydání

Monona

Místo konání akce

Portorož

Datum konání akce

12. 7. 2020

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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