Dimensional Stability of Poplar Wood after Densification Combined with Heat Treatment

Cai, Jia Bin; Ding, Tao; Yang, Lo

doi:10.4028/www.scientific.net/amm.152-154.112

Cited by 7 publications

(6 citation statements)

References 9 publications

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“…It was determined that there was a strong positive linear relationship between compression and the swelling ratio. In similar studies, it was demonstrated that the compression parameters remarkably affect the dimensional stability of the samples and that greater swelling occurs in the samples densified with a higher compression level (Lamason and Gong 2007;Ünsal et al 2011;Cai et al 2012;Pelit et al 2014;Budakçı et al 2015;Pelit et al 2016). It was also stated by Cai et al (2012) that the compression time and temperature are not important in terms of dimensional stability.…”

Section: Radial and Tangential Swellingmentioning

confidence: 93%

Effects of Thermo-Vibro-Mechanic® densification on the density and swelling of pre-treated Uludağ fir and black poplar wood

Budakçı

Şenol

Korkmaz

2021

BioRes

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The radial and tangential swelling as well as the fully dried density of low-density wood materials densified via the Thermo-Vibro-Mechanic® method were evaluated in response to applying wood stain and preservative. The samples obtained from Uludağ fir (Abies bornmüelleriana Mattf.) and black poplar (Populus nigra L.) in the radial and tangential direction were pre-treated with wood stain and preservative before undergoing Thermo-Vibro-Mechanic® densification. Thermo-Vibro-Mechanic® densification was performed at three different temperatures (100 °C ± 3 °C, 120 °C ± 3 °C, and 140 °C ± 3 °C), three different vibration pressures (0.60 MPa, 1.00 MPa, and 1.40 MPa), and three different vibration times (20 s, 60 s, and 100 s). Afterwards, changes in the fully dried density and swelling amounts in the radial and tangential directions of the samples were determined. The fully dried density increased by 15.4% to 38% and the radial and tangential swelling amounts increased by 73.2% to 242.6%, when the densified samples were compared to the control samples. In general, the fully dried density and swelling values increased depending on the Thermo-Vibro-Mechanic® densification parameters; higher values were found as the compression ratio and total application time increased.

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Section: Radial and Tangential Swellingmentioning

confidence: 93%

Effects of Thermo-Vibro-Mechanic® densification on the density and swelling of pre-treated Uludağ fir and black poplar wood

Budakçı

Şenol

Korkmaz

2021

BioRes

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“…Heat treatment can also be used to improve the dimensional stability of OSB boards, plywood [127], densified wood [121,128], and other wood composites [129].…”

Section: Heat Treatmentmentioning

confidence: 99%

Dimensional Stabilization of Wood

Kocaefe

2015

Curr Forestry Rep

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This paper comprehensively reviews the relevant literature and presents the methods and processes used to investigate the dimensional stabilization of wood using various modification techniques, including (a) hydrophobization of wood surfaces to block the entrance and exit of water; (b) impregnation treatment with bulking agents, such as resin and wax, to maintain wood in a swollen state and diminish dimensional changes caused by moisture; (c) chemical treatment with different chemical agents to reduce the hygroscopicity of the wood; and (d) high temperature heat treatment, which modifies wood components, reducing accessible hydroxyl groups and decreasing the possibility of water absorption. The results of dimensionally stabilizing wood via different treatments are interpreted and compared, and the effects of treating conditions and parameters on the dimensional changes of wood are analyzed.

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“…The increase in density occurs as a result of the compaction (Unsal et al 2011, Arruda and Del Menezzi 2013, Cabral et al 2022. Compaction directly influences dimensional stability, with a tendency for swelling in samples with higher compression rates (Unsal et al 2011, Cai et al 2012.…”

Section: Resultsmentioning

confidence: 99%

Surface changes in wood submitted to thermomechanical densification

Carvalho,

Pereira da Rocha,

Klitzke

et al. 2024

Maderas-Cienc Tecnol

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Ideal thermomechanical treatment conditions that reduce roughness and increase hydrophobicity of the wood surface require further investigation. In this study, a thermo-mechanical densification process was applied to Gmelina arborea (gamhar) wood. Three temperatures were used (140 °C, 160 °C and 180 °C) and two compaction rates (20 % and 40 %), applied for 30 minutes in a hot hydraulic press with final pressure of 2,5 MPa. Chemical changes, wettability and surface roughness of control and densified samples were investigated, as well as morphological changes. Densification partially degraded the hemicelluloses. Consequently, the wettability of the tangential surface of the densified wood decreased, with a more hydrophobic surface. Similarly, densification reduced surface roughness, especially when filtering was used for natural wood structures, with morphological changes on the surface of the densified samples. Densification with the highest temperature (180 °C) and 20 % compaction created the most hydrophobic surface (>90 °). In contrast, densification with the lowest temperature (140 °C) and compaction of 40 % provided the best results of the roughness parameters, with significant reductions, making it an applicable technique to minimize the roughness of wood in general and improve surface quality.

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Dimensional Stability of Poplar Wood after Densification Combined with Heat Treatment

Cited by 7 publications

References 9 publications

Effects of Thermo-Vibro-Mechanic® densification on the density and swelling of pre-treated Uludağ fir and black poplar wood

Effects of Thermo-Vibro-Mechanic® densification on the density and swelling of pre-treated Uludağ fir and black poplar wood

Dimensional Stabilization of Wood

Surface changes in wood submitted to thermomechanical densification

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