Abstract
Quality assessment of thermally modified spruce (Picea abies (L.) Karst) and beech (Fagus sylvatica L.) wood and of the corresponding reference samples was carried out by means of non-destructive FT-NIR spectroscopic measurements and PLS regression. Oven-dry and basic density as well as MOE and MOR determined by 3-point bending tests were evaluated. The focus was put on specimens produced from material that had been thermally modified in an industrial scale kiln. Modelling results range from poor to very good. The results of the spectra taken from the spruce samples resulted in better prediction results than the spectra of the beech samples. This could be due to different proveniences or variation in the industrial modification process. The results indicate that FT-NIR surface measurements of sound thermally modified wood samples could be applied to evaluate several characteristics before and after the modification process. The method could be used for screening during pre-sorting of thermally modified wood.
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References
Bächle H, Zimmer B, Windeisen E, Wegener G (2009) Non destructive evaluation of thermally modified ash by near infrared spectroscopy. In: Proceedings of the 4th European conference on wood modification, Stockholm, Sweden, 27–29 April, 2009, pp 173–176
Bekhta P, Niemz P (2003) Effect of high temperature on the change in colour, dimensional stability and mechanical properties of spruce wood. Holzforschung 57:539–546
Brischke C, Welzbacher C, Brandt K, Rapp A (2007) Quality control of thermally modified timber: Interrelationship between heat treatment intensities and CIEL*a*b* colour data on homogenized wood samples. Holzforschung 61:19–22
CEN/TS 15679 (2007) Thermally modified timber (TMT)—Definitions and characteristics
DIN 52182 (1976) Prüfung von Holz, Bestimmung der Rohdichte
DIN 52186 (1978) Prüfung von Holz, Biegeversuch
Esbensen KH (2002) Multivariate data analysis—in practice. An introduction to multivariate data analysis and experimental design, 5th edn. CAMO Process AS, Oslo, Norway
Esteves B, Pereira H (2008) Quality assessment of heat-treated wood by NIR spectroscopy. Holz Roh- Werkst 66:323–332
Esteves B, Pereira H (2009) Wood modification by heat treatment: a review. Bioresources 4:370–404
Gindl W, Teischinger A, Schwanninger M, Hinterstoisser B (2001) The relationship between near infrared spectra of radial wood surfaces and wood mechanical properties. J Near Infrared Spectroscopy 9:255–261
Gonzalez-Peña M, Hale M (2009) Colour in thermally modified wood of beech, Norway spruce and Scots pine. Part 2: property predictions from colour changes. Holzforschung 63:394–401
Hill ASC (2006) Wood modification: chemical, thermal and other processes. Wiley series in renewable resources, Wiley, Chichester
Hinterstoisser B, Schwanninger M, Stefke B, Stingl R, Patzelt M (2003) Surface analysis of chemically and thermally modified wood by FT-NIR. In: Acker J, Hill ASC (eds) The first European conference on wood modification: ECWM 2003, University Laboratory of Wood Technology, Ghent, Belgium, 3–4 April 2003, pp 65–70
Johansson D, Moren T (2006) The potential of colour measurement for strength prediction of thermally treated wood. Holz Roh- Werkst 64:104–110
Kessler W (2007) Multivariate datenanalyse für die Pharma-, Bio- und Prozessanalytik. WILEY-VCH, Weinheim
Mitsui K, Inagaki T, Tsuchikawa S (2008) Monitoring of hydroxyl groups in wood during heat treatment using NIR spectroscopy. Biomacromolecules 9:286–288
Savitzky A, Golay EJ (1964) Smoothing and differentiation of data by simplified least squares procedures. Anal Chem 36:1627–1639
Scheiding W (2008) TMT im Jahr 2008: produktion, märkte, normung: 5. TMT workshop. Dresden, 24./25.04.2008
Schnabel T, Zimmer B, Petutschnigg AJ (2007) An approach to classify thermally modified hardwoods by colour. Forest Prod J 57(9):105–110
Schwanninger M, Hinterstoisser B, Gierlinger N, Wimmer R, Hanger J (2004) Application of fourier transform near infrared spectroscopy (FT-NIR) to thermally modified wood. Holz Roh- Werkst 62:483–485
So CL, Via B, Groom L, Schimleck L, Shupe T, Kelley S, Rials T (2004) Near infrared spectroscopy in the forest products industry. Forest Prod J 54(3):6–16
Tsuchikawa S (2007) A review of recent near infrared research for wood and paper. Appl Spectrosc Rev 42:43–71
Tsuchikawa S, Siesler HW (2003) Near-infrared spectroscopic monitoring of the diffusion process of deuterium labelled molecules in wood. Part I: softwood. Appl Spectrosc 57:675–681
Williams P, Norris HK (2001) Near-infrared technology in the agricultural and food sciences. American Association of Cereal Chemists. St. Paul, Minn., USA
Windeisen E, Wegener G, Bächle H, Zimmer B (2009) Relations between the chemical changes and mechanical properties of thermally treated wood. Holzforschung 63:773–778
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The investigations were funded by the Austrian Research Promotion Agency (FFG) in the program line “FHplus” (No. 811968).
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Bächle, H., Zimmer, B., Windeisen, E. et al. Evaluation of thermally modified beech and spruce wood and their properties by FT-NIR spectroscopy. Wood Sci Technol 44, 421–433 (2010). https://doi.org/10.1007/s00226-010-0361-3
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DOI: https://doi.org/10.1007/s00226-010-0361-3