Identify the mechanism of Adhesion wood coatings and coating penetration assessment techniques

In this study, the mechanism of penetration of various coatings on wood texture was investigated. Based on the results of microscopic studies, the penetration of the coating into the texture of soft and hard wood has been different. Among the factors affecting the penetration rate, the effect of anatomical structure is more important than other factors. In this study, wood cells were examined from an anatomical point of view and then, the mechanisms of coating penetration into wood tissue were investigated.In general, understanding the anatomical structure of wood and the characteristics of the coating has greatly contributed to the improvement of wood coating methods.The results showed that the preparation of the substrate surface such as grating and sanding causes changes in the penetration of the coating in the wood texture.Also, sanding causes the cell to deform and clog pores, or even completely prevent the coating from penetrating.The coating penetrates the wood tissue inside the vessel, wood rays and punctuation. Water-based coatings have been able to have more penetration than solvent-based coatings in wood. In addition, wood with a rough surface absorbs more of the coating and improves performance in absorbing pigments.