Modeling vertical density profile formation for strand-based wood composites during hot pressing: Part 2. Experimental investigations and model validation

Zhou, Cheng; Dai, Chunping; Smith, Gregory D.

doi:10.1016/j.compositesb.2011.05.037

Cited by 8 publications

(4 citation statements)

References 4 publications

(5 reference statements)

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“…Instead, it normally occurs at an inner layer nearby the panel surfaces. This is mainly because the thermal softening region in the surface layer can be partially offset because of the rapid moisture loss . However, because the peak density locates quite near the surface, it could be regarded as a representative of the surface density, and the variation at the surface region is ignored for simplification.…”

Section: Vertical Density Profile Of Virgin Medium Density Fibreboardmentioning

confidence: 99%

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A simplified model on vertical density profile and shrinkage ratio of virgin and charred medium density fibreboard

2013

Fire and Materials

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This work is part of a wider scope of research on developing comprehensive pyrolysis model for medium density fibreboard (MDF) in fires. A simplified model is developed to predict the vertical density profile of virgin MDF. The model shows that vertical density profile can be reproduced using a second order conic curve. Several sets of experimental data are used to validate the model with promising results that are presented. Further investigation shows that the density difference between surface and core densities tends to maintain constant within a range of 300 to 450 kg/m3. Moreover, the model can predict the mean density with an error less than 30 kg/m3. Typical MDF panels were experimentally charred using thermogravimetric analysis and cone calorimetry to investigate the shrinkage and density of char. The actual char density is measured as 330 kg/m3 with a uniform density distribution along the char layer thickness. A model is developed to predict the shrinkage ratios. The restraining effect caused by surface deformation will lead to different vertical and horizontal shrinkage ratios. The volume reductions at vertical and horizontal directions are experimentally measured as 40% and 20% for the two tested MDF panels, which is comparable with the model predictions. Copyright © 2013 John Wiley & Sons, Ltd.

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Section: Vertical Density Profile Of Virgin Medium Density Fibreboardmentioning

confidence: 99%

“…The heat will be transferred from the mat surface into the cooler core through conduction and convection along with the moisture vapour migration. Thickness of the raw mat will be reduced while hot‐pressing, and once it reaches the target thickness, the press closing stops meanwhile the majority of the VDP establishes .…”

Section: Introductionmentioning

confidence: 99%

A simplified model on vertical density profile and shrinkage ratio of virgin and charred medium density fibreboard

2013

Fire and Materials

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“…The mechanical performances of OSB is closely related to its internal structure. Dai et al found that the bending strength of OSB was influenced by the vertical density profile (VDP) [3,4]. The modulus of elasticity (MOE) of OSB can be increased by optimizing VDP.…”

Section: Introductionmentioning

confidence: 99%

Combining X-ray CT and DIC to understand the bending strength of OSB

Dong-hu

Duan

et al. 2022

Construction and Building Materials

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“…Using the transmission values and the gravimetric weight/density, the density profiler can calculate the density distribution over the plane. X-ray density profiling was previously used to model the vertical density profile formation in wood composites during the pressing processes [40] or to evaluate the effectiveness of different wood modifications [38,41]. Therefore, in light of the past successful integrations of X-ray density profiling in data modelling and evaluation, the application in QC of modified wood is of high interest.…”

Section: Introductionmentioning

confidence: 99%

Investigations of the Chemical Distribution in Sorbitol and Citric Acid (SorCA) Treated Wood—Development of a Quality Control Method on the Basis of Electromagnetic Radiation

Kurkowiak¹,

Mayer²,

Emmerich³

et al. 2022

Forests

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Recent studies showed treatments with sorbitol and citric acid (SorCA) to significantly improve the dimensional stability and biological durability of wood. The industrialization of this process requires a quality control (QC) method to determine if the fixated chemicals are homogenously distributed within the piece of wood, which is essential for uniform material performance. Therefore, the objective of this work was to evaluate the use of common electromagnetic radiation-based methods to determine the degree of modification in SorCA-treated wood. Both Fourier transform infrared (FTIR) spectroscopy and near-infrared (NIR) spectroscopy have been used to create rough calibrations for the weight percent gain (WPG) prediction models. The FTIR measurements resulted in a high linear correlation between the band area ratio (BAR) and the WPG (R2 = 0.93). Additionally, a partial least square (PLS) regression of NIR spectroscopic data resulted in a model with a high prediction power (R2 = 0.83). Furthermore, X-ray density profiling emerged as a simple alternative for the QC by showing a gradient of modification chemicals inside the sample and differences in chemical uptake between earlywood and latewood. Overall, it can be concluded that the results from FTIR, NIR and X-ray densitometry can serve as indicators of impregnation chemical distribution in SorCA-modified wood.

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Modeling vertical density profile formation for strand-based wood composites during hot pressing: Part 2. Experimental investigations and model validation

Cited by 8 publications

References 4 publications

A simplified model on vertical density profile and shrinkage ratio of virgin and charred medium density fibreboard

A simplified model on vertical density profile and shrinkage ratio of virgin and charred medium density fibreboard

Combining X-ray CT and DIC to understand the bending strength of OSB

Investigations of the Chemical Distribution in Sorbitol and Citric Acid (SorCA) Treated Wood—Development of a Quality Control Method on the Basis of Electromagnetic Radiation

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