Dimensional Stabilization of Wood

Kocaefe, Duygu; Kocaefe, Yasar S.

doi:10.1007/s40725-015-0017-5

Cited by 73 publications

(50 citation statements)

References 112 publications

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“…Furthermore, it was stated that several factors had contributed to the increase in the dimensional stability of the wood via heat treatment. These included the loss of hygroscopic hemicellulose polymers during heat treatment leading to a decrease of the hydroxyl groups and the consequent reduction of the hygroscopic features, the cross-linking or bridging of cellulose chains as a result of the splitting of two hydroxyl groups on adjacent cellulose chains under high temperature conditions, and the cross-linking of the aromatic rings in the lignin (Kocaefe et al 2015).…”

Section: Fig 3 Comparative Appearance Of Compression Ratio Recoverymentioning

confidence: 99%

Effects of Heat Post-Treatment on Dimensional Stability and Water Absorption Behaviours of Mechanically Densified Uludağ Fir and Black Poplar Woods

Pelit¹,

Budakçı²,

Sönmez³

2016

BioResources

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One of the most persistent problems with mechanically densified wood is its inherent dimensional instability. The effects of heat post-treatment on the changes in spring-back (SB), compression ratio recovery (CRR), thickness swelling (TS), and water absorption (WA) of newly-tested Uludağ fir (Abies bornmuelleriana Mattf.) and black poplar (Populus nigra L.) wood samples that had been thermo-mechanically densified were investigated. Samples were densified with compression ratios of 25% and 50% with temperatures of 100 and 140 °C, respectively. Then, the heat post-treatment was applied to the samples at 185 and 212 °C for 2 h. For the two newly-tested wood types, results of the preliminary study show that SB and TS were higher at a 50% compression ratio compared with 25%. Regarding densification temperature, TS was lower in samples densified at 140 °C, while SB was higher. WA values were lower in compressed samples (50%) at high rates. The effect of the densification temperature on WA was insignificant. Heat post-treatment had a considerable effect on the dimensional stability and hygroscopicity of the densified Uludağ fir and black poplar samples. With an increase in heat treatment temperature, the dimensional stability increased, while the hygroscopicity of densified samples decreased. As a result of heat posttreatment applied at 212 °C, SB, CRR, TS, and WA decreased by 88%, 85%, 79%, and 53%, respectively.

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Section: Fig 3 Comparative Appearance Of Compression Ratio Recoverymentioning

confidence: 99%

Effects of Heat Post-Treatment on Dimensional Stability and Water Absorption Behaviours of Mechanically Densified Uludağ Fir and Black Poplar Woods

Pelit¹,

Budakçı²,

Sönmez³

2016

BioResources

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“…An increase in the resistance of wood to water and biotic agents is the main aim of its thermal modification [5,10]. 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].…”

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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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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“…The control and T1 form a group based on the WA, the T2 and T3 form another group based on both the WA and the TS. Wood swelling decreased with increasing treatment times and temperature (Boonstra et al 2006, Winandy -Smith 2006, Kocaefe et al 2015. The study of Xiangquan et al (1997) illustrated that post-treatment of the particleboard manufactured from fast growing poplars is effective to improve dimensional stability.…”

Section: Resultsmentioning

confidence: 97%

“…As mentioned above, the chemical structure of the cell walls is modified during the heat treatment, and equilibrium moisture content (EMC), water uptake (WA), and thickness swelling (TS) decreased (Tjeerdsma -Militz 2005;, Akyildiz -Ateş 2008, Esteves -Pereira, 2009, Kol -Sefil 2011, Kocaefe et al 2015, Pelit et al 2017. As bio-based (lignocellulose) materials are hygroscopic, they absorb water from the surrounding air.…”

Section: Resultsmentioning

confidence: 99%

Insulation Panels Made from Thermally Modified Bark

Pásztory

Tsalagkas

Horváth

et al. 2019

Acta Silvatica Et Lignaria Hungarica

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Thermally treated and ground poplar bark was used as the raw material for pressed bark insulation panels. Bark chips were treated for one, two, and three hours at 180 °C after a slow warming, drying process. The physical and mechanical properties of the pressed panels were investigated and compared to each other and to the control panel made of untreated bark chips. Thermal conductivity showed slight deviations and ranged from 0.064 – 0.067 W·m−1·K−1. The MOR and MOE showed a significant increase of 100%. The internal bond increased by 27% while the water absorption and thickness swelling decreased by 53.8% and 69.1% respectively. Panel density did not change significantly because the target density was the same for every panel type. The mechanical and physical properties of thermal insulation panels made of heat-treated chips increased significantly.

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Dimensional Stabilization of Wood

Cited by 73 publications

References 112 publications

Effects of Heat Post-Treatment on Dimensional Stability and Water Absorption Behaviours of Mechanically Densified Uludağ Fir and Black Poplar Woods

Effects of Heat Post-Treatment on Dimensional Stability and Water Absorption Behaviours of Mechanically Densified Uludağ Fir and Black Poplar Woods

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

Insulation Panels Made from Thermally Modified Bark

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