Propriedades físicas da madeira de teca termorretificada

Lopes, Juliana de Oliveira; Garcia, R. Á.; Nascimento, Alexandre Miguel do; Latorraca, João Vicente de Figueiredo

doi:10.1590/2179-8087.040213

Cited by 3 publications

(4 citation statements)

References 8 publications

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“…For the same process and temperature, Bellon et al (2014) also reported the same pattern of reduction in the ρ 12 for both eucalyptus and teak, with 10% and 16%, respectively, for TMEW and TMTW. Lower reductions were reported by Lopes et al (2014b) for TMTW sapwood (6%) and heartwood (9%), in a laboratory-scale process at 180 and 200°C. Thermal modification (120°C to 180°C) caused a slight decrease (3.58%) in the density of teak wood (Priadi et al 2019).…”

Section: Physical Propertiesmentioning

confidence: 66%

“…than for TMEW (31% or 3.5 p.p.). Lopes et al (2014b) reported reductions in hygroscopicity varying from 46% to 54%, and 45% to 54%, respectively for TMTW heartwood and sapwood.…”

Section: Resultsmentioning

confidence: 99%

“…The magnitude of these changes is dependent on the process, where the final temperature is one of the most important factors. In general, the higher the temperature, the higher the reduction in the density (Hill 2006; Lopes et al 2014b; Batista et al 2018).…”

Section: Resultsmentioning

confidence: 99%

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Physical and mechanical properties of thermally modified short-rotation wood in a closed system

Brito

Ferreira

et al. 2023

International Wood Products Journal

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This work aimed to evaluate the effect of a closed system thermal modification process on some physical and mechanical properties of eucalypt and teak short-rotation wood. We assessed untreated eucalypt and teak (EW and TW) and thermally modified eucalypt and teak wood (TMEW and TMTW). The process was carried out at 160°C for 45 min, and we performed some physical and mechanical tests. Thermal modification reduced the mechanical resistance and hygroscopicity and increased the dimensional stability of wood. The normal density (ρ 12 ) of TMTW was reduced, but no significant effect was verified for TMEW, although it had an absolute reduction of 7%. For both conditions (untreated and thermally modified), teak was more resistant to failure (higher MOR in static bending), and no difference between the species was verified for MOE. Eucalypt wood was more resistant to compression parallel to the grain in both conditions.

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Section: Physical Propertiesmentioning

confidence: 66%

“…than for TMEW (31% or 3.5 p.p.). Lopes et al (2014b) reported reductions in hygroscopicity varying from 46% to 54%, and 45% to 54%, respectively for TMTW heartwood and sapwood.…”

Section: Resultsmentioning

confidence: 99%

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Physical and mechanical properties of thermally modified short-rotation wood in a closed system

Brito

Ferreira

et al. 2023

International Wood Products Journal

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“…Cademartori et al (2015 also found a decrease in dimensional stability due to thermal modification in Eucalyptus grandis and Eucalyptus saligna woods. Lopes et. al.…”

Section: Resultsmentioning

confidence: 99%

Effect of thermal modification on wood properties of 38-year-old Cariniana legalis cultivated at different spacing

et al. 2021

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Planting spacing influences wood production. However, for tropical species we have scarce information about the effect of spacing on production and wood quality. In general, wood from native species produced in reforestation does not have the same quality compared to that from natural forests. Then, wood thermal modification can help improve the potential for using wood. In this context, our goal was to evaluate the influence of thermal modification on properties of 38-year-old Cariniana legalis wood cultivated at different spacing (3 x 1.5m, 3 x 2m and 3 x 2.5m) at the Luiz Antônio Experimental Station, Luiz Antônio City, São Paulo. We felled 15 trees, five of each spacing, and from each tree, a log, 1 meter in length, a central plank was cut, and from these planks, we cut specimens for anatomical and wood properties investigations according to standard techniques. In the specimens, a thermal modification at a temperature of 200ºC was carried out for one hour and after the specimens were compared with the control specimens. According to the results presented, we found that spacing did not influence vessel diameter, apparent density and volumetric shrinkage significantly. Thermal modification reduced apparent density and volumetric shrinkage. The reduction in vessel diameter can be estimated as a function of the wood thermal modification.

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Properties of thermally modified teakwood

Lengowski

Júnior

Nisgoski

et al. 2020

Maderas, Cienc. tecnol.

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Thermal modification is a treatment that seeks to improve the properties of wood and reduce the heterogeneity in its color. The objective of this work was to evaluate the effect of thermal treatment on the anatomical, chemical, physical, mechanical, colorimetric, and thermal stability properties of teakwood. For this, teakwood samples were treated by an industrial autoclave at final cycle temperature of 160 ºC. The reduction of cell wall thickness, the formation of cross-fissures and the crystallization of the wax inside the pores were observed in the anatomical structure. Chemically, the extractives evaporated and the polysaccharides ruptured, of which hemicellulose was the most affected. The heat treatment promoted lower equilibrium moisture, reducing the hygroscopicity and improving the dimensional stability of the wood. Considering the mechanical properties, the rupture modulus and the longitudinal and tangential hardness decreased after the heat treatment. The color of the wood changed significantly, from pink to dark brown. The treated wood had higher thermal stability, with greater weight loss at higher temperatures than the untreated wood.

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Propriedades físicas da madeira de teca termorretificada

Cited by 3 publications

References 8 publications

Physical and mechanical properties of thermally modified short-rotation wood in a closed system

Physical and mechanical properties of thermally modified short-rotation wood in a closed system

Effect of thermal modification on wood properties of 38-year-old Cariniana legalis cultivated at different spacing

Properties of thermally modified teakwood

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