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3 Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

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Water absorption process in the thermo-mechanically modified iroko and tauari wood

Laskowska A., Wyszyńska J., Zbieć M.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

2018

No. 104

496--503

The purpose of the study was to determine the impact of thermo-mechanical treatment on absorption and absorption speed of iroko (Milicia exelsa (Welw.) C.C. Berg) and tauari (Couratari spp.) wood. Wood was densified in a hydraulic press in the radial direction at 100 oC and 150 oC. The modification temperature had greater impact on the density of tauari wood than on the density of iroko wood. Water absorption process depended on the wood species, the type of material (non-densified, densified), densification temperature. Iroko wood was characterized by a greater dynamic of changes in water absorption over time than tauari wood. The densified tauari wood at the maximum saturation had lower moisture content than the non-densified tauari wood. Speed of water absorption in thermo-mechanically modified wood was lower than in non-densified wood, especially noticeable in the first 30 seconds of soaking.

Assessment of compressive strength and compressive modulus parallel to the grain of oak and tauari wood after thermo-mechanical modification

Laskowska A.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

2018

No. 103

70--76

European oak and tauari wood were subjected to thermomechanical modification. One treatment cycle consisted of three stages: heating the wood in a hydraulic press; wood densification; and cooling the wood samples in unheated hydraulic press without exerting pressure. The treatment temperature was 100 °C or 150 °C. The modification temperature significantly affected the compressive strength parallel to the grain of oak and tauari wood. Such dependencies were not found in the case of compressive modulus of elasticity parallel to the grain of tested wood species. The compressive strength of tauari wood modified at 100 oC and 150 oC was, respectively, 16% and 20% greater than the compressive strength of oak wood modified at the same temperatures. The compressive strength parallel to the grain of the oak and tauari wood depended linearly on wood density and load.

Drewno dębu i tauari poddano obróbce termo-mechanicznej. W pierwszym etapie drewno ogrzewano kontaktowo w prasie hydraulicznej, następnie zagęszczano, po czym poddawano chłodzeniu w nieogrzewanej prasie hydraulicznej bez użycia ciśnienia. Temperatura półek prasy, przy której prowadzono proces zagęszczania drewna wynosiła 100°C lub 150°C. Temperatura obróbki wykazała istotny wpływ na wytrzymałość na ściskanie wzdłuż włókien drewna dębu i tauari. Zależności tych nie stwierdzono w przypadku modułu przy ściskaniu wzdłuż włókien badanych gatunków drewna. Wytrzymałość na ściskanie drewna tauari zagęszczanego w temperaturze 100°C i 150°C była odpowiednio o 16% i 20% wyższa niż wytrzymałość na ściskanie drewna dębu modyfikowanego w tych samych temperaturach. Wytrzymałość na ściskanie wzdłuż włókien drewna dębu i tauari zależała liniowo od gęstości drewna i obciążenia wywieranego na próbkę.

Effect of temperature of thermo-mechanical treatment of pine wood (Pinus sylvestris L.) veneers upon gloss and wettability

Krystofiak T., Bekhta P., Muszyńska M.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

2014

No. 88

126--129

Effect of temperature of thermo-mechanical treatment of pine wood (Pinus sylvestris L.) veneers upon gloss and wettability. The aim of investigations was determination of gloss and wettability of pine wood veneers after thermo-mechanical treatment. Rotary cut veneer sheets of pine wood and moisture content of 5% were chosen for the experiments. In laboratory hydraulic press was densification at temperatures of 150, 180, and 210°C, pressure 3 MPa, and time 3 min. Gloss of veneers was determined with the photoelectric method with PICO GLOSS apparatus. Wettability measurements were performed microscope methods with the goniometric equipment. It was stated, that temperature of thermo-mechanical treatment influenced on the course of gloss and wettability.