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

As a continuation of previous paper on modeling vertical density profile (VDP) formation for wood strand composites, this paper presents typical prediction results from the VDP model and describes the experimental investigations. By taking into account the non-uniform mat structure, the model can predict not only the overall panel VDP but also the localized VDP of a given area within the panel. Thus it links the horizontal density distribution to the vertical density distribution within the panel. The proposed model was validated by comparing its predictions with experimental data. Also the model can predict the effects of some key pressing parameters on VDP formation. Longer press closing times or preheating of the mat is found to make the VDP of the panel more uniform. This study is valuable for improving the fundamental understanding of the relationship between pressing variables and panel properties for process optimization.