Equilibrium moisture content of hydrothermally and thermo-mechanically modified oak wood

• Autorzy: Laskowska Agnieszka , Kłosińska Teresa , Skirko Daniel

Identyfikatory

DOI

10.5604/01.3001.0055.4347

Warianty tytułu

PL

Wilgotność równoważna drewna dębu modyfikowanego hydrotermicznie i termo-mechanicznie

• Języki publikacji: EN

Abstrakty

EN

Equilibrium moisture content of hydrothermally and thermo-mechanically modified oak wood. The aim of the study was to determine the effect of hydrothermal and thermo-mechanical modification of oak wood (Quercus robur L.) on equilibrium moisture content (EMC) under relative air humidity (RH) conditions: 9 %, 34 %, 55 %, 75 %, 98 %. It was found that the density of thermo-mechanically modified (densified) oak wood (variant IV) and density of oak wood after hydrothermal treatment for 150 min and densification (variant V) was lower for samples conditioned in a climate with a relative air humidity of 75 % and 98 % than for samples conditioned in a lower relative air humidity. However, the density of oak wood after hydrothermal treatment for 300 min and densification (variant VI) was lower for samples conditioned in a climate with a relative air humidity of 98 %. Densified oak wood (variants IV-VI) was characterized by the lowest EMC values for most of the relative humidity levels tested, except for the highest (98 %), where the EMC values were the same as for non-densified oak wood: control (variant I), after hydrothermal treatment (variants II and III). The lowest EMC values were noted for oak wood subjected to hydrothermal treatment for 300 min and densification (variant VI). In climates with relative air humidity of 9 %, 34 %, 55 %, 75 % the EMC values were about 0.50, 1.00, 1.00, 2.00 percentage points lower than for non-modified oak wood (variant I), respectively. The results indicate that the effect of the investigated modification methods on the tested properties of oak wood was varied and largely depends on the type of modification used and the environmental conditions.

PL

Wilgotność równoważna drewna dębu modyfikowanego hydrotermicznie i termo-mechanicznie. Celem badań było określenie wpływu modyfikacji hydrotermicznej i termo-mechanicznej drewna dębu na wilgotność równoważną (EMC) w klimacie o różnych poziomach wilgotności względnej powietrza (RH): 9%, 34%, 55%, 75%, 98%. Stwierdzono, że gęstość drewna dębu zagęszczonego termo-mechanicznie (wariant IV) oraz gęstość drewna dębu poddanego obróbce hydrotermicznej przez 150 min i zagęszczaniu (wariant V) była niższa dla próbek klimatyzowanych w klimacie o wilgotności względnej powietrza 75 % i 98 % niż dla próbek klimatyzowanych w klimacie o niższej wilgotności względnej powietrza. Jednakże gęstość drewna dębu poddanego obróbce hydrotermicznej przez 300 min i zagęszczaniu (wariant VI) była niższa dla próbek klimatyzowanych w klimacie o wilgotności względnej powietrza 98%. Zagęszczone drewno dębu (warianty IV-VI) charakteryzowało się najniższymi wartościami EMC dla większości badanych poziomów wilgotności względnej powietrza, z wyjątkiem najwyższego (98%), dla którego wartości EMC były takie same jak dla niezagęszczonego drewna dębu: kontrolnego (wariant I) oraz po obróbce hydrotermicznej (warianty II i III). Najniższe wartości EMC odnotowano dla drewna dębu poddanego obróbce hydrotermicznej przez 300 min i zagęszczaniu (wariant VI). W klimatach o wilgotności względnej powietrza 9 %, 34 %, 55 % i 75 % wartości EMC były odpowiednio o około 0.50, 1.00, 1.00 i 2.00 punkty procentowe niższe niż dla niemodyfikowanego drewna dębu (wariant I). Wyniki wskazują, że wpływ badanych metod modyfikacji na oznaczane właściwości drewna dębu był zróżnicowany i w dużej mierze zależał od rodzaju zastosowanej modyfikacji oraz warunków środowiskowych.

Słowa kluczowe

EN

densification; equilibrium moisture content; EMC; hydrothermal modification; oak wood; relative humidity; thermo-mechanical modification; wood density

• Wydawca: Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
• Czasopismo: Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
• Rocznik: 2025
• Tom: No. 130
• Strony: 16--25
• Opis fizyczny: Bibliogr. 33 poz., tab., rys.

Twórcy

autor

Laskowska Agnieszka

• Department of Wood Science and Wood Preservation, Institute of Wood Sciences and Furniture, Warsaw University of Life Sciences – SGGW, Poland

• https://orcid.org/0000-0001-6212-3100

autor

Kłosińska Teresa

• Department of Wood Science and Wood Preservation, Institute of Wood Sciences and Furniture, Warsaw University of Life Sciences – SGGW, Poland

• https://orcid.org/0000-0001-6538-2634

autor

Skirko Daniel

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