Abstract
The objective of this study was to evaluate the glossiness of black alder wood (Alnus glutinosa L.) samples coated with two varnish types as a function of exposure to dry heat and artificial aging. The chemical resistance of the coated samples to cold liquids was also evaluated. Based on the findings in this work, it appears that the varnish types and their structural differences influenced the overall glossiness of the coated samples. The UV varnish exhibited higher gloss values than those coated with the water-borne product within the range of silky gloss and silky matte grades. The heat exposure influenced the surface glossiness of the UV-coated samples more than the samples coated with water-borne varnish. The overall gloss values of the samples decreased with the exposure time to artificial aging, resulting in no layer cracks. The cold household liquids left less visible traces on the surfaces and alcohol was found to be the strongest agent. This study could have practical applications in the furniture industry to produce value-added furniture units according to their specific conditions of indoor use.
Highlights
The varnish type and their structural differences influenced the glossiness of the coated samples [42]
The gloss values of the samples coated with the UV varnish for both directions of measurement were found to be higher than the gloss values obtained when using the water-borne product to varnish the samples
The parallel gloss value at 60◦ geometry increased after coating from 2.95 to 34.87 gloss units (GU) in the case of the UV varnish, while the surfaces coated with water-borne varnish reached 27.21 GU
Summary
The glossiness of any surface is used to evaluate the quality of a finished product as a result of reflection due to the incident light from different directions [1,2]. High gloss surfaces are in demand in the furniture industry, but matte gloss still has its importance in a specific solid wood furniture market. A reflection structure image of high-gloss composite products was developed as an alternative method to describe the visual human perception of gloss [3]. A model based on the value generation of wooden furniture has been validated by these qualitative, innovative, and ecological products. These products are used as reliable and environmentally friendly furniture [5,6]
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