Abstract

Near infrared (NIR) spectroscopy has been used in several studies to predict the physical and mechanical properties of pulp hand-sheets. In most of these studies, wood samples were pulped in a laboratory under different regimes and/or refined to introduce variability into the data set. This study investigates the potential of NIR spectroscopy to create calibrations for eucalyptus pulp properties of mill-line origin. Seven mechanical properties (air resistance, compressibility, drainability, hygro-expansivity, stretch, tensile index and tensile stiffness) and three physical properties (bulk density, specific volume, and surface area) were investigated. Coefficients of deter mination (R²) for all 10 properties were poor. The R²_C value exceeded 0.70 for only one property (tensile index), while the R²_CV values exceeded 0.40 for only two properties (drainability and surface area). Ratios of performance to deviation were equally poor, ranging from 0.87 for bulk density to 1.28 for drainability. These statistics indicate that none of the calibrations could be used to accurately predict the properties of unknown samples. The poor performance of the calibrations is likely due to the low variability of our dataset, which is generally inherent in samples of mill-line origin.

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