Autowood

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Autowood

T. Jost and O. Hüsser

Keywords

Visual inspection, quality control, wood quality

Need for a wood surface quality criteria

The wood industry lacks objective criteria for the evaluation of wood surface quality. Available criteria are inherited from metallurgy and are not suited. As today surface quality estimation is strongly bound to the subjective feeling from one touching the wood surface, it is believed that such an objective criteria can be derived from features obtained from surface topography.

The goal of this project is to propose wood surface features derived from topography measurements and to assess their potential to describe the different surface qualities resulting from variation in the wood production and wood processing.

Wood topography measurements

Considered candidates for wood topography measurements are microscopy, scanning electron microscopy (SEM), multifocus 3D microscopy (M3M) and confocal microscopy


Microscopy, 11x11 mm	M3M, 2 mm x 2 mm	SEM, 0.6x0.4 mm	Confocal m., 0.2 mm

Fig. 1 Several AFM measurements (left) are combined to build up the 3D model of a micrometric cristal particle.

The preference is given to confocal microscopy for the first experimental evaluation.

Database

Systematic measurement were performed on a set of samples comprising various kinds of wood (chipboard, mapple, oak) and different types of sanding (grain 100 and 150).