Naslov
Mechanism of Infection of Fir wood (Abise alba Mill.) Joinery ; . Part 2 : Sequence and intensity of attack of microorganisms
(Mechanism of Infection of Fir wood (Abise alba Mill.) Joinery. Part 2 : Sequence and intensity of attack of microorganisms)

Autori
Despot, Radovan

Izvornik
Drvna industrija (0012-6772) 49 (1998), 3; 135-144

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Fir-wood joinery; L-joints; preservation; bacterial and fungal colonisation; biodeterioration; wood decay

Sažetak
In Croatia the primary raw material for joinery production is silver fir wood (Abies alba Mill). L-joints made of home-grown fir sapwood and prepared according to EN 330: 1993. were used to establish the colonisation and infection of micro-organisms to compare the performance of untreated and 1% TnBTO treated L-joints by ten-minute immersion. The L-joints surfaces were coated with two types of liquid coat, and exposed on three different climate sites in Croatia. The first type of coat was alkyd paint and the second was a stain, in three different colours ; white, brown and black. The untreated L-joints were examined after 1, 2, 3, 4, 6, and 12 months and treated after 12 months of exposure. The influence of the climate, and the type of coat were most important factors which affected the rate of colonisation. In Zalesine, a mountain site with the highest average air humidity and greatest amount of precipitation, colonisation was fastest and strongest. The lowest bacterial and fungal colonisation occurred in L-joints exposed in Rovinj, a site on the Adriatic coast, particularly on those coated with a darker stain. It was due to the well known vaporous diffusivity of the stains and the fact that Rovinj had the largest number of sunny days during the first two months of exposure when the dark stain surfaces absorbed many more of the sun's heat rays which caused accelerated seasoning, lower moisture contents and lower bacterial colonisation. The influence of coat colours later was not significant. The differences between one year exposed untreated and treated L-joints were significant according to the moisture content, permeability and fungal colonistaion . The colonisation and fungal attack of treated L-joints was lower, particularly of those coated with stain. The most frequently isolated fungi were Alternaria alternata (Fr.) Keissler, Gloeophyllum trabeum (Fr.) Pers. and Aurobasidium pullulans (de Bary) Arnaud.

Izvorni jezik
Engleski

Znanstvena područja
Biotehnologija

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