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Estimation of physical and mechanical properties of agro-based particleboards by near infrared spectroscopy

Beurteilung physikalischer und mechanischer Eigenschaften von agro-basierten Spanplatten mittels Nahinfrarot-Spektroskopie

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Abstract

Partial least square regression (PLS-R) calibrations based on near infrared (NIR) spectroscopic data were developed in order to predict mechanical and physical properties of agro-based particleboards. The panels were manufactured using Eucalyptus and Pinus wood particles and sugar cane bagasse. The following panel properties were evaluated according to standard methods: modulus of elasticity (MOE), modulus of rupture (MOR), internal bonding (IB) strength, water absorption (WA24H), and thickness swelling (TS24H) after 24 hours of immersion. NIR spectra information was measured on samples cut from each particleboard and correlated with their physical and mechanical properties by PLS-R to build predictive NIR models. The NIR models for IB, WA24H and TS24H presented satisfactory coefficient of determination (0.73; 0.72 and 0.75, respectively.) The key role of resins (adhesives), cellulose, and lignin for NIRS calibrations of mechanical and physical properties of the particleboards is shown. These models can be useful to quickly verify such properties in unknown agro-based particleboards.

Zusammenfassung

Partial Least Square Regression (PLS-R) Kalibrierungen auf der Grundlage von nahinfrarot- (NIR)-spektroskopischen Daten wurden zur Bestimmung der mechanischen und physikalischen Eigenschaften von agro-basierten Spanplatten entwickelt. Die Platten wurden aus Eukalyptus- und Kiefernholz- und Bagassespänen hergestellt. Die folgenden Eigenschaften wurden mittels Standardprüfverfahren beurteilt: Elastizitätsmodul (MOE), Biegefestigkeit (MOR), Querzugfestigkeit (IB), Wasseraufnahme (WA24H) und Dickenquellung (TS24H) nach 24-stündiger Wasserlagerung. NIR-Spektren wurden an Proben aus jeder Spanplatte gemessen und mit den mittels PLS-R bestimmten physikalischen und mechanischen Eigenschaften korreliert, um daraus NIR-Modelle zu entwickeln. Die NIR-Modelle für IB, WA24H und TS24H ergaben zufrieden stellende Bestimmtheitsmaße (0,73, 0,72 bzw. 0,75). Aufgezeigt wurde die Schlüsselrolle der Harze, Zellulose und Lignin für die NIRS-Kalibrierung der mechanischen und physikalischen Eigenschaften von Spanplatten. Diese Modelle können sich zur schnellen Überprüfung dieser Eigenschaften von agro-basierten Spanplatten als nützlich erweisen.

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Acknowledgements

The authors express their thanks to the Universidade Federal de Lavras, Departamento de Ciência e Tecnologia da Madeira, for supporting the experimental work and, particularly, to Dr. Paulo F. Trugilho for enabling the NIRS analysis. Special thanks to the reviewers for their remarkable advices. The research was funded by CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico, Brazil) and FAPEMIG (Fundação de Amparo à Pesquisa do Estado de Minas Gerais, Brazil). P.R.G. Hein was supported by CNPq (process no. 200970/2008-9).

Conflict of interest The first author is supported by CNPq and the co-authors have not a financial relationship with the organization that sponsored the research. We declare that there is no conflict of interest.

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Correspondence to Paulo Ricardo Gherardi Hein.

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Hein, P.R.G., Campos, A.C.M., Mendes, R.F. et al. Estimation of physical and mechanical properties of agro-based particleboards by near infrared spectroscopy. Eur. J. Wood Prod. 69, 431–442 (2011). https://doi.org/10.1007/s00107-010-0471-5

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