The effect of wood surface finish on its hygroscopic properties
Journal Title: Annals of WULS, Forestry and Wood Technology; Zeszyty naukowe SGGW - Year 2017, Vol 100, Issue
Abstract
The effect of wood surface finish on its hygroscopic properties. This work determines hygroscopic properties, such as humidity and swelling, of pine wood (Pinus sylvestris) oak wood (Quercus L.), wenge (Millettia laurentii) and merbau (Intsia bijuga) with surfaces coated with a polyurethane lacquer. The testes wood samples were moistened for 30 days in a climate with a temperature of 40ºC and air relative humidity of 95%. As a result of performed analyses it was concluded that the changes of moisture content increase and tangential and axial swelling of lacquered wood were significantly lower, particularly during the first day of testing, than those of non-lacquered wood samples. At the same time, after a longer time the moisture content and swelling of both types of samples were becoming equal, regardless of the wood species. The tests showed that the applied coats of polyurethane lacquer protect wood against moisture only during a short period of time, i.e. up to several hours.
Authors and Affiliations
Ewa Dobrowolska, Agnieszka Mielnik, Hanna Chmielewska
Keywords
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