Performance of Three Alternative Surfacing Processes on Black Spruce Wood and Their Effects on Water-Based Coating Adhesion
Keywords:
Black spruce wood, oblique cutting, face milling, helical planing, surface quality, coatingAbstract
Surface quality and water-based coating performance of samples prepared by oblique cutting, helical planing, and face milling were studied. Oblique cutting and helical planing generated surfaces with similar features. Samples had little subsurface damage and fibrillation, and few cell lumens were accessible on the surface to favor coating penetration. As a result, these samples had lower surface roughness and wetting properties than face-milled ones. Face-milled samples were defined by more subsurface damage, fibrillation, and open lumens that favored coating penetration. However, the pull-off strength of face-milled samples was significantly lower after accelerated weathering than the oblique-cut or helical-planed samples. Hence, oblique cutting and helical planing are suitable for preparing surfaces of black spruce prior to coating application. No correlations were detected between surface quality parameters and adhesion, which indicates that pull-off tests have to be determined to quantify coating adhesion on surfaces of this wood species.References
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