Abstract
The effect of applying cetol and finishing varnish products and sanding on the surface roughness and colour of marupa (Simarouba amara) wood was evaluated. Three coats of each product were applied and two sandpaper grits were used, 280 and 320). The analyzes were performed on untreated samples and between each coat of products in order to analyze the effect of sanding, the products and the number of coats. According to colorimetry, the L* value for the control treatment was 82,83 and the treatments reduced the L* to 61,70 on average for the cetol treatment and 77,09 for the varnish treatment, showing that the cetol darkened the wood more than the varnish. The yellowish and reddish pigmentations became more intense according to the positive values of Δa* and Δb*, especially after applying the cetol. The total colour variation ΔE average was 40,79 for the cetol treatment and 9,83 for the varnish treatment, confirming a much more significant colour change in the cetol treatment. Sanding with different grits did not significantly alter the surface colour. The product application made the wood surface smoother, and was noticeable from the second coat. Sanding reduced roughness on the wood surface, but the finishing product was the largest source of variation.
Highlights
Marupa wood is a pioneer species belonging to the Simaroubaceae family and is naturally distributed throughout the Amazon Region, the Central West and Southwest of Brazil
The objective of this work was to evaluate the behavior of the colour and surface roughness of marupa wood treated with cetol and varnish finishing products, in addition to sanding with 280 and 320 grit sandpaper between each product coat in order to analyze the effect of sandpaper, finishing products and the number of applications
The samples were initially sanded by 4 sanding cycles, each corresponding to one round and back of the sandpaper on the sample’s surface, and three coats of varnish or cetol were applied with a brush onto each sample; 4 sanding cycles were applied on the sample surface between the first and second coating
Summary
Marupa wood is a pioneer species belonging to the Simaroubaceae family and is naturally distributed throughout the Amazon Region, the Central West and Southwest of Brazil. According to Cavalcante (2006), the wood of this species is light, beige-yellowish to cream, and presents a smooth texture when it receives a glossy finish; it is sawn, nailed, screwed and planed, in addition to receiving various finishes It can be used in the furniture industry and in manufacturing toys, linings and boxes to store documents and other valuable materials. Souza et al (1997) cited still other uses of marupa wood such as in civil and naval construction, bridges, etc., and it can be used in reforestation programs in regions of its natural distribution because it is a species with rapid growth This species still needs to be further studied, mainly when used in the furniture segment. The characteristics observed in the wood are the colour, the design, the roughness, the smell and its behavior before applying sandpaper and finishing products
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