Faanyagok hővezetési tulajdonságainak változása a termikus kezelés hatására

Börcsök Zoltán; Pásztory Zoltán

Erdészettudományi Közlemények / 10. évfolyam / 1. szám / 17-27. oldal
előző | következő

Börcsök Zoltán és Pásztory Zoltán

Kapcsolat a szerzőkkel

Levelező szerző: Börcsök Zoltán

Cím: H-9400 Sopron, Bajcsy-Zs. u. 4.

e-mail cím: borcsok.zoltan[at]uni-sopron.hu

Kivonat

Kutatásunk célja a különböző időtartamú hőkezelés és néhány fizikai, valamint a hővezetési tulajdonságok közötti összefüggések detektálása. A vizsgálatok során lucfenyő (Picea abies), Pannónia nyár (Populus × euramericana cv. Pannónia) és gumifa (Hevea brasiliensis) faanyagot 180 °C-on 15, 25 és 35 órás hőkezelésnek vetettünk alá. Méréseink igazolták, hogy a hőkezelt anyagból készült próbatestek egyensúlyi fanedvessége, sűrűsége és hővezetési tényezője alacsonyabb, mint a kezeletlen mintadaraboké. Az átlagos nettó egyensúlyi nedvességtartalom a kezdeti 12% körüli értékről mind a három fafaj, mindhárom kezelési idejében 6% körüli értékre csökkent. A sűrűség csökkenése 15, 25, illetve 35 órányi kezelés után nyár esetében rendre 9,1, 12,1, illetve 13,4%, lucnál 5,2, 7,6 és 8,7%, gumifánál pedig 3,5, 5,1 és 7,1%. A sűrűség csökkenése 15, 25, illetve 35 órányi kezelés után nyár esetében rendre 17,0, 24,2, 25,2%, lucnál; 8,5, 11,6, 19,2%, gumifánál pedig 3,6, 4,1, és 8,0%. Irodalmi adatokkal alátámasztható, hogy a hőkezelés által a faanyag egyensúlyi fanedvessége és sűrűsége csökken, mely magyarázza az alacsonyabb hővezetési tényezőt az azonos alapanyagból készült kontroll mintadarabhoz képest.

Kulcsszavak: hőkezelés, faanyag, hővezetés, sűrűség, egyensúlyi fanedvesség

Hivatkozott irodalom76

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Burmester A. 1973: Einfluss einer Wärme-Druck-Behandlung halbtrockenen Holzes auf seine Formbeständigkeit. Holz als Roh- und Werkstoff 31: 237–243. DOI: 10.1007/BF02607268

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Burmester A. 1974b: Erfolgreiche Quellungsvergütung mit einfachen Mitteln (2) – Die Wärme-Druck-Behandlung von Holzwerkstoffen-technische Durchführung Wirtschaftlichkeit. Holz- und Kunststoffverarbeitung 8/74: 610–615

Čabalová I., Kačík F., Lagaňa R., Výbohová E., Bubeníková T., Čaňová I. & Ďurkovič J. 2018: Effect of thermal treatment on the chemical, physical, and mechanical properties of pedunculate oak (Quercus robur L.) wood. BioResources 13(1): 157–170.

Chaouch M., Pétrissans M., Pétrissans A. & Gérardin P. 2010: Use of wood elemental composition to predict heat treatment intensity and decay resistance of different softwood and hardwood species. Polymer Degradation and Stability 95: 2255–2259. DOI: 10.1016/j.polymdegradstab.2010.09.010

Esteves B.M. & Periera H.M. 2009: Wood modification by heat treatment: a review. BioResources 4(1): 370–404. DOI: 10.15376/biores.4.1.370-404

Fengel D., 1966: Thermisch und mechanisch bedingte Strukturänderungen bei Fichtenholz. Holz als Roh- und Werkstoff 24: 529–536 DOI: 10.1007/BF02610356

Fengel D. & Wegener G., 1989: Wood – Chemistry, ultrastructure, reactions. Walter de Gruyter, Berlin

Giebeler E. 1983: Dimensionsstabilisierung von Holz durch eine Feuchte/Wärme/Druck-Behandlung. Holz Roh- Werkstoff 41:87–94. DOI: 10.1007/BF02608498

Grønli M.G. 1996: Theoretical and experimental study of the thermal degradation of biomass. PhD dissertation. Norwegian University on Science and Technology, Faculty of Mechanical Engineering, Department of Thermal Energy and Hydropower, Trondheim, Norway

Gündüz G., Niemz P. & Aydemir D. 2008: Changes in specific gravity and equilibrium moisture content in heat-treated Fir (Abies nordmanniana subsp. bornmülleriana Mattf.) wood. Drying Technology: An International Journal 26(9): 1135–1139. DOI: 10.1080/07373930802266207

Hanhijärvi A., Wahl P., Räsänen J. & Silvennoinen R., 2003: Observation of development of microcracks on wood surface caused by drying stress. Holzforschung 57: 561–565. DOI: 10.1515/HF.2003.083

Hill C.A.S. 2006: Wood modification: Chemical, thermal and other processes. InWood modification; Stevens, C.V., Ed.; JohnWiley & Sons: Hoboken, NJ, USA. Volume 5, pp. 99–127.

Hillis W.E. 1984: High temperature and chemical effects on wood stability. Wood Science and Technology 18: 281–293 DOI: 10.1007/BF00353364

Hinterstoisser B., Schwanninge M., Stefke B.; Stingl R. & Patzelt M. 2003: Surface analyses of chemically and thermally modified wood by FT-NIR. In The 1st European Conference on Wood Modification Proceedings of the First International Conference of the European Society for Wood Mechanics; van Acker, J.; Hill, C. (eds): Ghent, Belgium, April 2–4, 2003; 65–70.

Homan W., Tjeerdsma B., Beckers E. & Joressan A. 2000: Structural and other properties of modified wood. Congress WCTE 2000, 1, 18–35.

Isebrands J.G. & Richardson J. (eds) 2014: Poplars and willows: trees for society and the environment. ISBN 978-1-78064-108-9 (co publisher FAO)

ITTO 2009: Encouraging industrial forest plantations in the tropics. International Tropical Timber Organization, Yokohama

Jämsä S. & Viitaniemi P. 1998: Heat treatment of wood. Better durability without chemicals. Nordiske Trebeskyttelsesdager 47–51

Jämsä S. & Viitaniemi P. 2001: Heat treatment of wood – Better durability without chemicals. In: Review on heat treatments of wood. Proceedings of the special seminar on heat treatments. 09.02.2001 in Antibes. 17–22.

Junghans K., Niemz P. & Bächle F. 2005: Untersuchungen zum Einfluss der thermischen Vergütung auf die Porosität von Fichtenholz. Holz als Rohund Werkstoff 63: 243–244. DOI: 10.1007/s00107-004-0553-3

Kačik F., Ďurkovič J. & Kačiková D. 2012: Chemical profiles of wood components of poplar clones for their energy utilization. Energies 5: 5243–5256. DOI: 10.3390/en5125243

Killmann W. & Hong L.T. 2000: Rubberwood – the success of an agricultural by-product. Unasylva 51: 66–72.

Klose W. & Schinkel A. 2002: Measurement and modelling of the development of pore size distribution of wood during pyrolysis. Fuel Processing Technology 77–78: 459–466. DOI: 10.1016/S0378-3820(02)00082-6

Kol Ş.H. 2009a: The transverse thermal conductivity coefficients of some hardwood species grown in Turkey. Forest Products Journal 59(10): 60–64. DOI: 10.13073/0015-7473-59.10.58

Kol Ş.H. 2009b: Thermal and dielectric properties of Pine wood in transverse direction. BioResources 4(4): 1663–1669. DOI: 10.15376/biores.4.4.1663-1669

Kol Ş.H. & Altun S. 2009: Effect of some chemicals on thermal conductivity of impregnated laminated veneer lumbers bonded with poly(vinyl acetate) and melamine-formaldehyde Adhesives. Drying Technology 27: 1010–1016. DOI: 10.1080/07373930902905092

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Open Acces - Nyílt hozzáférés

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Javasolt hivatkozás:

Börcsök Z. és Pásztory Z. (2020): Faanyagok hővezetési tulajdonságainak változása a termikus kezelés hatására. Erdészettudományi Közlemények, 10(1): 17-27. DOI: 10.17164/EK.2020.002

előző | következő

10. évfolyam 1. szám,
17-27. oldal

DOI: 10.17164/EK.2020.002

Közlésre elfogadva:
2020. május 11.

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A szerzők további cikkei a folyóiratban

Témájukban kapcsolódó cikkek az Erdészettudományi Közleményekben*

1.	Börcsök Z. és Pásztory Z. (2020): Kéregalapú hőszigetelő lemez tulajdonságainak javítása. Erdészettudományi Közlemények, 10(1): 29-39.

Börcsök Z. és Pásztory Z. (2020): Kéregalapú hőszigetelő lemez tulajdonságainak javítása. Erdészettudományi Közlemények, 10(1): 29-39.

A szerzők további megjelent cikkei az Erdészettudományi Közleményekben

1.	Folcz Á., Börcsök Z., Dima B. és Frank N. (2013): A Soproni-hegység bazídiumos nagygombáinak erdészeti szempontú vizsgálata. Erdészettudományi Közlemények, 3(1): 179-194.
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3.	Kocsis Z., Németh G., Börcsök Z., Polgár A., Király É., Kóczán Zs. és Borovics A. (2022): A faipari folyamatok szénlábnyom-elemzéséhez kapcsolódó logisztikai és energiafelhasználási konverziós faktorok megadása. Erdészettudományi Közlemények, 12(1): 57-73.

Folcz Á., Börcsök Z., Dima B. és Frank N. (2013): A Soproni-hegység bazídiumos nagygombáinak erdészeti szempontú vizsgálata. Erdészettudományi Közlemények, 3(1): 179-194.

Börcsök Z., Adamik P. és Pásztory Z. (2019): Fakéreg hasznosítási lehetőségeinek áttekintése. Erdészettudományi Közlemények, 9(2): 113-138.

Kocsis Z., Németh G., Börcsök Z., Polgár A., Király É., Kóczán Zs. és Borovics A. (2022): A faipari folyamatok szénlábnyom-elemzéséhez kapcsolódó logisztikai és energiafelhasználási konverziós faktorok megadása. Erdészettudományi Közlemények, 12(1): 57-73.

* Automatikusan generált javaslatok a szerzők által megadott kulcsszavak más cikkek címében és kivonataiban való előfordulása alapján. Részletesebb kereséshez kérjük használja a manuális keresést.