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Query: "keywords" (drying) .

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Changes of ashwood pH-value during conventional drying
Aleš Straže, Sandi Torkar, Vesna Tišler, Željko Gorišek, 2003, original scientific article

Abstract: Changes of pH of sawn wood during conventional drying were studied. Green ashwood boards (Fraxinus excelsior L.), 25.4 mm in thickness, were exposed to 1 month air drying and to kiln drying using 7 schedules, reached by varying temperature (20°C, 30°C and 65°C) and relative air humidity (33% to 90%). Wood samples for pH and moisture content (MC) determination were taken in successive time interval at 3 board`s depths (1/10, 1/3 and 1/2 of thickness).MC was established gravimetrically. pH-value determination of solid wood water system by suspending wood dust into distilled water was used. The lowest used temperature and duration of drying procedure had not significant influence on wood pH. Wood acidification was confirmed at higher drying temperatures (30°C and 65°C), particularly with lower drying rates and prolongation of the procedure. Among all the factors, drying temperature had the greatest impact on the pH-value of wood.
Keywords: ash-wood, pH-value, drying, drying conditions
Published in DiRROS: 12.07.2017; Views: 2841; Downloads: 1211
.pdf Full text (279,40 KB)

Influence of drying temperature on properties of wood surfaces
Milan Šernek, 2002, original scientific article

Abstract: This article deals with modifications of wood surface properties induced by different drying temperatures. The aim of the study was chemical and physical characterization of a wood surface concerning low and high temperature exposure. Additionally, the correlation between the chemical composition of a wood surface and its wetting capacity were investigated. X-ray photoelectron spectroscopy and contact angle measurements were conducted. Two wood species, yellow poplar (Liriodendron tulipifera) and southern pine (Pinus taeda) were studied. The results showed that the percentage of carbon increased with drying temperature, and consequently, the percentage of oxygen decreased. The samples exposed to high drying temperatures indicated a higher content of extractives on the wood surface. These samples exhibited the highest contact angle and the lowest wettability
Keywords: površina lesa, sušenje, kontaktni kot, rentgenska fotoelektronska spektroskopija, omočitev, ekstraktivne snovi, wood surface, drying, contact angle, XPS, wettability, extractives
Published in DiRROS: 12.07.2017; Views: 3068; Downloads: 1239
.pdf Full text (932,44 KB)

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