The effects of increasing preservative uptake by microwave pre-treatment on the microstructure and mechanical properties of Oriental spruce wood

Kol, Hamiyet Şahin; Çayır, Barış

doi:10.1080/17480272.2022.2077656

Cited by 9 publications

(32 citation statements)

References 12 publications

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“…Although Eucalyptus MW-treated specimens had f c 0,12% smaller than the control group, the obtained value is the same as that of the heartwood Pinus MW-treated and control groups. For the sapwood Pinus results, Kol and Çayır (2021) and Kol and Çayır (2022) used Oriental spruce sapwood specimens and had similar results with no significant difference for f c 0,12% . The arithmetic means are shown for each wood group, and the standard deviations are the numbers in parentheses.…”

Section: Evaluation Of Water Uptakementioning

confidence: 83%

“…Considering the need to follow the sample's weight along the drying cycle, the MW drying comprises successive periods of MW drying and sample weight on a scale located outside the MW oven. Based on the preliminary tests and research carried out by Kol and Çayır (2021), Kol and Çayır (2022), who used 30s cooling intervals, and Ramezanpour et al (2014), who used intervals of 60 to 90 s in each 60 to 150 s of MW exposure in order to avoid cracking caused by fast moisture loss from wood, the samples are cooled during these breaks, and the water vapor loss is weighted. Therefore, each treatment run lasted 30 s, followed by 60 s for cooling and homogenizing the MC of the specimens before measuring the weight.…”

Section: Methodsmentioning

confidence: 99%

“…Oloyede and Groombridge (2000) found similar results for drying Pinus caribaea using MW energy, while the conventional kiln drying method required hours. Furthermore, Kol and Çayır (2021), Kol and Çayır (2022) obtained total drying times varying from 15 to 61 minutes for Oriental spruce (Picea orientalis (L.) Link.) small clear wood samples made only of sapwood with initial moisture content from 55 % to 135 %.…”

Section: The Mw Dryingmentioning

confidence: 99%

“…Several research papers about the MW modification of wood specimens have been developed using small clear specimens and small and commercial microwave ovens, such as the one carried out by Hansson and Antti (2003) that studied Norway spruce (Picea abies), Hermoso and Vega (2016) that studied Eucalyptus globulus from the Northwest of Spain, Kumar et al (2016) and Poonia and Tripathi (2018) that studied Pinus roxburghii Sarg., Ouertani et al (2018) that studied Jack pine (Pinus banksiana) wood, Samani et al (2019) that studied Melia composita, Ganguly et al (2021) that studied Norway spruce and Kol and Çayır (2021) and Kol and Çayır (2022) that studied Oriental spruce (Picea orientalis (L.) Link. ).…”

Section: Introductionmentioning

confidence: 99%

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Effect of microwave treatment on drying and water impregnability of Pinus pinaster and Eucalyptus globulus

Mascarenhas

Dias

Christofóro³

et al. 2022

Maderas, Cienc. tecnol.

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Wood is a material that has been used by humankind for a long time. However, wood researchers and industry have always been concerned about the issues during wood drying and the permeability problems of certain species. In this sense, microwave technology has been applied for wood drying and improving permeability. This paper investigates the microwave drying of two Portuguese wood species, Pinus pinaster sap and heartwood, and Eucalyptus globulus heartwood using small clear specimens. The samples were grouped into six during each microwave treatment run according to their similarity of initial moisture content. Once the drying was completed, control and microwave-treated samples were impregnated with desalinated water to analyze their improvement in water absorption, and the compression strength parallel to the grain was analyzed. The results showed that each wood species behaves differently under microwave drying and initial moisture content. The impregnation results demonstrated that pine and Eucalyptus microwave-treated heartwood samples improved their capability to absorb water. Finally, only the microwave-treated specimens of Eucalyptus heartwood presented a decrease in the values of compression strength parallel to the grain compared to the control group. Therefore, MW treatment presents possibilities for further applications for the wood industry with supporting results.

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Section: Evaluation Of Water Uptakementioning

confidence: 83%

Section: Methodsmentioning

confidence: 99%

Section: The Mw Dryingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of microwave treatment on drying and water impregnability of Pinus pinaster and Eucalyptus globulus

Mascarenhas

Dias

Christofóro³

et al. 2022

Maderas, Cienc. tecnol.

View full text Add to dashboard Cite

show abstract

“…Furthermore, the compound middle lamella (CML) between the tracheids exhibited tears and micro-cracks (Figure 5e). These phenomena can be attributed to the vapor pressure generated by the rapid evaporation of water inside the wood [17,24]. Upon further increasing the MWED to 100 kWh/m 3 , a portion of the weakened tracheid walls were torn, and the cracks propagated along the direction of microfibers, which are parallel to the microfiber angle of the S2 layer of the wood cell wall.…”

Section: Sem Analysismentioning

confidence: 99%

Effect of High-Intensity Microwave Treatment on Structural and Chemical Characteristics of Chinese Fir

Liao,

Fang,

Gao

et al. 2024

Forests

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High-intensity microwave (HIMW) treatment is a time-saving and environmentally friendly method widely applied in the wood processing industry. It enhances wood permeability, making it suitable for drying and impregnation modification. This study aimed to investigate the effects of HIMW on macroscopic and microscopic cracks, tracheid cell wall damage, and the chemical structure of Chinese fir [Cunninghamia lanceolata (Lamb.) Hook] wood. Through the use of a camera, optical microscope, scanning electron microscope, transmission electron microscope, Fourier-transform infrared spectroscopy, and X-ray diffraction, the morphology of cracks, cell wall damage, the chemical composition of the cell wall, and the crystalline structure of cellulose treated with HIMW were examined and analyzed. The results revealed that the initial moisture content (MC) and microwave energy density (MWED) significantly influenced the crack characteristics and cell wall structure and slightly influenced the chemical composition and crystalline structure of cellulose of the Chinese fir cell wall. HIMW treatment can produce different characteristics of wood cracks. The size and number of cracks were significantly increased with the increase in MWED, and more cracks were found in low MC. Microcracks caused by HIMW treatment tended to initiate at the ray parenchyma, resulting in the stripping of ray cells along its radial direction. Meanwhile, the cracking of adjacent cell junctions, the rupturing of the pit margo and pit torus, and cell wall parts tearing along the direction of microfibers occurred as a result of the HIMW treatment. The most severe damage to the cell walls occurred at the interface of S1/S2, S1, and ML layers, and the cell walls were torn in the S2 layer. There were no significant changes in the FTIR spectra of the HIMW treatment samples. Hemicellulose degradation occurred first, which increased with the increase in MWED. The recrystallization of cellulose and the lignin content increased because of the change in the aromatic C=O groups. As MWED increased, both the crystallinity index (CI) and cellulose crystal width (D200) of the samples that underwent HIMW treatment increased accordingly, and the number of low-MC samples was greater than that of the high-MC samples. The findings contribute to understanding the crack characteristics and damage mechanism induced by HIMW treatment on wood. This study provides valuable insights into regulating the effects of HIMW treatment and expanding its application in wood processing, such as wood drying and functionalized impregnation, according to the specific end-use requirements.

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Improving gas permeability and characterizing the multi-scale pore size distribution of radiata pine (Pinus radiata D. Don) treated via high-intensity microwave

Xing,

Li,

Jin

et al. 2023

Wood Sci Technol

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The effects of increasing preservative uptake by microwave pre-treatment on the microstructure and mechanical properties of Oriental spruce wood

Cited by 9 publications

References 12 publications

Effect of microwave treatment on drying and water impregnability of Pinus pinaster and Eucalyptus globulus

Effect of microwave treatment on drying and water impregnability of Pinus pinaster and Eucalyptus globulus

Effect of High-Intensity Microwave Treatment on Structural and Chemical Characteristics of Chinese Fir

Improving gas permeability and characterizing the multi-scale pore size distribution of radiata pine (Pinus radiata D. Don) treated via high-intensity microwave

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