The influence of sanding system on wetting of Paulownia siebold et zucc.

• Main Authors: Jaić Milan, Palija Tanja, Dobić Jovan
• Format: Article
• Language: srp
• Published: Faculty of Forestry, Belgrade 2010-01-01
• Series: Glasnik Šumarskog Fakulteta: Univerzitet u Beogradu
• Subjects: Paulownia; sanding; parameters of surface roughness; wetting; contact angle
• Online Access: http://www.doiserbia.nb.rs/img/doi/0353-4537/2010/0353-45371001067J.pdf

This paper presents the research of influence of wood surface preparation on the wetting ability of polyurethane coatings, by the method of contact angle. The samples were made of two species of Paulownia (Paulownia elongata and Paulownia fortunei). All the samples were processed by planing (molding). After molding, the samples were arranged in groups and sanded. In relation with wood grain direction, each group had a particular system of sanding, based on the numbering of sanding paper, program of displacement of sanding papers with different numbering and the direction of sanding. The quality of wood surface after sanding was expressed by the values of roughness parameters in the system 'M': Ra, Rz, Rv, Rp and Rt. The contact angle was measured using transparent polyurethane (PU) coating and distilled water. The influence of the system of sanding on the values of contact angle was analyzed by roughness parameter Ra.