The Relationship between near Infrared Spectra of Radial Wood Surfaces and Wood Mechanical Properties

Gindl, Wolfgang; Teischinger, Alfred; Schwanninger, Manfred; Hinterstoisser, Barbara

doi:10.1255/jnirs.311

Cited by 91 publications

(65 citation statements)

References 26 publications

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“…Such correlation between NIR absorbance and microfibril angle have been detected both across various ages and within specific density classes for radiata pine (Pinus radiata), loblolly pine (Pinus taeda), and eucalyptus (Eucalyptus globulus) On the other hand, the basis for how NIR can measure microfibril angle is still uncertain (Gindl et al 2001). Wavelengths associated with cellulose have shown considerable variation in response to microfibril angle (Kelley et al 2004a).…”

Section: Introductionmentioning

confidence: 99%

Within Tree Variation of Lignin, Extractives, and Microfibril Angle Coupled With the Theoretical and Near Infrared Modeling of Microfibril Angle

Via¹,

So²,

Groom³

et al. 2007

IAWA J

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SUMMARYA theoretical model was built predicting the relationship between microfibril angle and lignin content at the Angstrom (A) level. Both theoretical and statistical examination of experimental data supports a square root transformation of lignin to predict microfibril angle. The experimental material used came from 10 longleaf pine (Pinuspalustris) trees. Klason lignin (n=70), microfibril angle (n=70), and extractives (n=100) were measured and reported at different ring numbers and heights. All three traits were strongly influenced by ring age from pith while microfibril angle and extractives exhibited more of a height effect than lignin. As such, the multivariate response of the three traits were different in the axial direction than the radial direction supporting that care needs to be taken when defining juvenile wood within the tree. The root mean square error of calibration (RMSEC) for microfibril angle of the theoretical model (RMSEC = 9.8) was almost as low as the least squares regression model (RMSEC = 9.35). Microfibril angle calibrations were also built from NIR absorbance and showed a strong likeness to theoretical and experimental models (RMSEC = 9.0). As a result, theoretical and experimental work provided evidence that lignin content played a significant role in how NIR absorbance relates to microfibril angle. Additionally, the large variation in extractives content coupled with sampling procedure proved important when developing NIR based calibration equations for lignin and microfibril angle.

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Section: Introductionmentioning

confidence: 99%

Within Tree Variation of Lignin, Extractives, and Microfibril Angle Coupled With the Theoretical and Near Infrared Modeling of Microfibril Angle

Via¹,

So²,

Groom³

et al. 2007

IAWA J

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“…Gindl et al (2001) Figure 4 presents the relationship between MOR values obtained from laboratory tests and those estimated by NIR. From estimated values by NIR spectroscopy and those determined by the universal testing machine, it was possible to ascertain the quality of the models considering both samples (Figure 4).…”

Section: Calibration For Estimating Mechanical Propertiesmentioning

confidence: 99%

Determination of Heat-Treated Eucalyptus and Pinus Wood Properties Using Nir Spectroscopy

Ajv¹,

Hein²,

Ag³

et al. 2018

JTFS

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“…Recently, NIR spectroscopy has been used to measure several properties of wood and paper products (Thygesen and Lundquist 2000, Gindl et al 2001, Tsuchikawa and Tsutsumi 2002, Meder et al 2003, Schimleck et al 2007. The potential use of NIR as an on-site monitoring tool for manufacturing processes has been further spurred by its application in wood composite manufacture (So et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Vis–NIR spectroscopy for the on-site prediction of wood properties

Kobori

Kojima

Yamamoto

et al. 2013

The Forestry Chronicle

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We investigated the feasibility of visible-near-infrared (Vis-NIR) spectroscopy for estimation of wood qualities of fast-growing Eucalyptus grandis. Partial least squares regression (PLSR) models are applied to predict the diameter at the breast height (DBH), lateral growth rate (LGR) and propagation velocity of stress waves (PVSW). It was possible to estimate LGR and PVSW with appropriate accuracy. This suggested that perhaps information in terms of maturation is included in Vis-NIR spectra. The key factors in the validation of PVSW and LGR were the water and cellulose condition in wood.Keywords: Eucalyptus grandis, Vis-NIR spectroscopy, lateral growth rate, propagation velocity of stress wave résumé Nous avons investigué la faisabilité d'utiliser la spectroscopie visible et proche infrarouge (Vis-PIR) pour estimer les qualités du bois d'Eucalyptus grandis à croissance rapide. Des modèles de régression des moindres carrés partiels (PLS) ont été appliqués pour prédire le diamètre à hauteur de poitrine (DHP), le taux de croissance latérale (TCL) et la vitesse de propagation d' ondes de contraintes (VPOC). Il a été possible d' estimer le TCL et la VPOC avec une exactitude appropriée. Cela suggère qu'il est possible que de l'information relative à la maturation soit incluse dans les spectres Vis-PIR. Les facteurs clés dans la validation de VPOC et TCL ont été les conditions de l' eau et de la cellulose dans le bois.

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The Relationship between near Infrared Spectra of Radial Wood Surfaces and Wood Mechanical Properties

Cited by 91 publications

References 26 publications

Within Tree Variation of Lignin, Extractives, and Microfibril Angle Coupled With the Theoretical and Near Infrared Modeling of Microfibril Angle

Within Tree Variation of Lignin, Extractives, and Microfibril Angle Coupled With the Theoretical and Near Infrared Modeling of Microfibril Angle

Determination of Heat-Treated Eucalyptus and Pinus Wood Properties Using Nir Spectroscopy

Vis–NIR spectroscopy for the on-site prediction of wood properties

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