engleski

BACTERIAL COLONISATION OF EXTERIOR FIR-WOOD JOINERY

In Croatia primary raw material for joinery manufacture is fir wood (Abies alba, Mill). According, in this article Fir sapwood L-joints have been used to established the bacterial colonisation in compare the performance of untreated and 1% TnBTO treated L-joints by ten-minute immersion. L-joints were coated with two types of coat, and exposed on three different climate sites in Croatia. The first type of coat was alkyd paint and the second was stain in three different colours; white, brown and black. Untreated L-joints were examined after 1, 2, 3, 4, 6, and 12 months and treated after 12 months of exposure. The influence of climate, and the type of coat were most important for bacterial colonisation. In Zalesine, a mountain site with highest average air humidity and large number of rainy days, bacterial colonisation was the fastest and strongest The lowest bacterial colonisation occurred in L-joints exposed in Rovinj, a site at the Adriatic coast, particularly on those coated with darker stain. It was due to well known vaporous difusivity of stains and the fact that Rovinj had the highest number of sunny days during the first three months of exposure when the dark stain surfaces absorbed meny more sunny heat rays providing accelerated seasoning, lower moisture contents and lower bacterial colonisation. The influence of coat colours later was insignificant . The differences between one- year- exposed untreated and treated L-joints were not significant. The treated L-joints, coated with stains showed lower bacterial colonisation particularly at positions 1, 2 and 3.

fir-wood; joinery; L-joints; preservation; bacterial colonisation

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