Biological Durability of Oil Heat Treated Alder Wood

Lacić, Robert; Hasan, Marin; Trajković, Jelena; Šefc, Bogoslav; Šafran, Branimir; Despot, Radovan

doi:10.5552/drind.2014.1256

Cited by 13 publications

(11 citation statements)

References 4 publications

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“…quantity of oxygen present [5,12,14,15]. In comparison to standard thermal modification of wood in hot air, higher resistance to decaying-fungi and water is ensured when hot plant oils and other hydrophobic agents are applied [12][13][14][16][17][18].…”

Section: Woodmentioning

confidence: 99%

“…Types and extent of changes in molecular structure and subsequently in properties of thermally modified wood depend not only on the temperature and its duration, but also on the wood species, its initial moisture content, as well as on parameters of air, nitrogen, plant oil or other heating medium [5,6,10,11]. Biological resistance of wood is not affected positively by the thermal modification carried out in the atmosphere at lower temperatures ranging from 130 to 160 • C [10,12,13]. In practice, an increase in wood resistance to wood-decaying fungi and insects results from the application of higher temperatures of air ranging from 160 to 220 • C, or also from temperatures up to 260 • C at the limited quantity of oxygen present [5,12,14,15].…”

Section: Introductionmentioning

confidence: 99%

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The Impact of Paraffin-Thermal Modification of Beech Wood on Its Biological, Physical and Mechanical Properties

Reinprecht¹,

Repák²

2019

Forests

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The European beech (Fagus sylvatica L.) wood was thermally modified in the presence of paraffin at the temperatures of 190 or 210 °C for 1, 2, 3 or 4 h. A significant increase in its resistance to the brown-rot fungus Poria placenta (by 71.4%–98.4%) and the white-rot fungus Trametes versicolor (by 50.1%–99.5%) was observed as a result of all modification modes. However, an increase in the resistance of beech wood surfaces to the mold Aspergillus niger was achieved only under more severe modification regimes taking 4 h at 190 or 210 °C. Water resistance of paraffin-thermally modified beech wood improved—soaking reduced by 30.2%–35.8% and volume swelling by 26.8%–62.9% after 336 h of exposure in water. On the contrary, its mechanical properties worsened—impact bending strength decreased by 17.8%–48.3% and Brinell hardness by 2.4%–63.9%.

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Section: Woodmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Impact of Paraffin-Thermal Modification of Beech Wood on Its Biological, Physical and Mechanical Properties

Reinprecht¹,

Repák²

2019

Forests

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“…At the beginning of the 20th century, Tiemann found that drying wood at high temperatures reduces its equilibrium moisture content [6]. One effect of this action is a greater biological durability of wood [7][8][9][10] and increased dimensional stability [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Acoustic Properties of Resonant Spruce Wood Modified Using Oil-Heat Treatment (OHT)

Mania

Gąsiorek

2020

Materials

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Wedge-shaped boards of spruce wood (Picea abies Karst.) are used to make violin fronts, also known as soundboards. Oil-heat treatment (OHT) can influence the acoustic properties of resonant wood, such as spruce. In this study, the effect of OHT on spruce wood was evaluated, using palm oil as a heating medium, at four different temperatures: 140, 160, 180 and 200 °C. Physical, mechanical and acoustic properties of spruce wood were evaluated before and after OHT and included the following: density, modulus of elasticity in the static bending test, and wood sound velocity. The acoustic parameters after OHT improved; however, the samples bent after modification had a higher modulus of elasticity, with a simultaneous deterioration of the acoustic parameters. The dynamic modulus of elasticity increased by 11%, and the musical constant by 5%. The static modulus increased by more than 3.5%, but the acoustic parameters calculated on the basis of these results indicated a deterioration of the acoustic properties of completely oven-dried wood. The increase in moisture content to air-dried condition contributed to a slight increase in the mean musical constant at the highest modification temperature.

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“…However, it is also prone to cracking, dimensional changes, and rotting, which considerably limit its outdoor applications (Boonstra and Tjeerdsma 2006;Poletto et al 2012;Lacic et al 2014). For these reasons, various chemical, physical, and biological methods have been used to modify wood so that its properties meet industrial requirements (Akgül et al 2006;Boonstra et al 2007;Azadfallah et al 2008;Adewopo and Patterson 2011;Hill et al 2011;Kutnar et al 2011;Yin et al 2011;Brischke et al 2014;Lacic et al 2014). Although chemical modifications work quickly, they release a considerable amount of toxic volatiles into the environment (Willems 2014).…”

Section: Introductionmentioning

confidence: 99%

Chemical Analysis of Densification, Drying, and Heat Treatment of Scots pine (Pinus sylvestris L.) through a Hot-Pressing Process

Li¹,

Wang²,

Wu³

2016

BioResources

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This study investigated a new potential hot-pressing method for wood modification, in which densification, drying, and heat-treatment were carried out in sequence. The effects of heat treatment on the chemical components of wood were evaluated. The specimens were treated at different temperatures (180 to 220 °C) for 2 to 5 h. Holocellulose, α-cellulose, and lignin were extracted from the treated and untreated milled wood. The changes in these components were analyzed by thermogravimetry (TG) and Fourier-transform infrared spectroscopy (FTIR). Due to its amorphous structure, most hemicelluloses were degraded when it was exposed to 220 °C for 3 h and to 200 °C for 5 h. Conversely, the lignin contents increased continuously throughout the treatment due to the loss of polysaccharides and the formation of cross-links. Because of the crystallinity, α-cellulose degradation was slight. According to the analysis of functional groups, FTIR showed treated wood was more hydrophobic than the untreated one.

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Biological Durability of Oil Heat Treated Alder Wood

Cited by 13 publications

References 4 publications

The Impact of Paraffin-Thermal Modification of Beech Wood on Its Biological, Physical and Mechanical Properties

The Impact of Paraffin-Thermal Modification of Beech Wood on Its Biological, Physical and Mechanical Properties

Acoustic Properties of Resonant Spruce Wood Modified Using Oil-Heat Treatment (OHT)

Chemical Analysis of Densification, Drying, and Heat Treatment of Scots pine (Pinus sylvestris L.) through a Hot-Pressing Process

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