Assessment of the Combined Charring and Coating Treatments as a Wood Surface Protection Technique

Flame treatment is an ancient technique for surface protection of wood. Further processing charred wood elements depends on aesthetic and protective requirements. This study presents some general properties weathering behaviour the Norway spruce (Picea abies (L.) Karst.) European larch (Larix decidua Mill.), protected by variations sanding, charring, charring + brushing, coating treatments. Charring brushing reduced original mass samples up to 8% notably changed their colour (ΔE* ≤ 75). A chemical showed that dehydrated degraded lignin hemicelluloses. The roughness after increased as much 560%, while with waterborne acrylic high build stain had no effect these surfaces. type did not affect uptake in samples, but uncoated coated absorbed more water than Higher absorption was observed treated it decreased when char layer removed brushing. film a only surfaces sanding Larch exhibited higher hardness (EHz 1.70 MPa) 0.89 MPa), brittle reducing determined tested During two years natural weathering, from surface, even if were additionally coated. greatest changes during 60) 33), followed 10) 9). In summary, treating combination best technique.