Effects of microwave pretreatment on drying of 50 mm-thickness Chinese fir lumber

Xiang, Wei; Zhou, Yue; Fu, Zhihao; Gao, Xin; Zhou, Fan; Jiang, Jinghui

doi:10.1186/s10086-021-01942-2

Cited by 21 publications

(33 citation statements)

References 18 publications

(19 reference statements)

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“…MW treatment has become more popular in the field of heat-treated wood products [4], and it has been used for a variety of purposes, including wood drying, [12][13][14][15], improvement of fluid permeability [7,8,[16][17][18][19], and impregnation by preservative agents [18,20]. Torgovinikov and Vinden [21] explained that hardwood species tend to take longer in the drying process.…”

Section: Introductionmentioning

confidence: 99%

State of the Art of Microwave Treatment of Wood: Literature Review

Mascarenhas

Dias

Christofóro

2021

Forests

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This paper presents a survey of the state of the art of microwave (MW) treatment of wood, informed by both past and recent research papers. It begins by introducing the main concepts regarding MW technology and its advantages, presenting a holistic perspective of this technology, and identifying 57 research papers published over the last 25 years. Next, an extensive literature review of the most significant experimental research papers is provided, divided into two MW heating treatment uses: wood drying and permeability improvement. For each study, the wood species, MW parameters, main objectives, and overall conclusions are provided. In this context, an explanation is given on how parameters such as MW power, frequency, intensity, and exposure time, as well as initial moisture content, influence the degree of wood modification. Next, a global overview of the most used wood species, genera, and dimensions is revealed. The paper concludes by indicating the potential fields of future research studies concerning the uses and applications of MW treatment technology.

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Section: Introductionmentioning

confidence: 99%

State of the Art of Microwave Treatment of Wood: Literature Review

Mascarenhas

Dias

Christofóro

2021

Forests

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“…Microwave pre-treatment may significantly reduce the formation of internal/ honeycombing and surface checking in drying [42]. The experiment of Weng et al witnessed the increase in the drying rate caused by microwave pre-treatment [43]. In Figure 2, it can be clearly seen that the drying time of the microwave pre-treatment sample is shorter than that of the control sample.…”

Section: Wood Drying Defects and Drying Stressmentioning

confidence: 95%

“…* means significant at 0.05 level, -means not significant at 0.05 level. Values of drying uniformity are standard deviations of the final MC[43].…”

mentioning

confidence: 99%

Drying Stress and Strain of Wood: A Review

Yin

Liu

2021

Applied Sciences

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Wood drying stress causes various drying defects, which result from the wood microstructure and the transfer of heat and mass during the drying. It is the fundamental way to solve the problem of defects to clarify the law and mechanism of wood stress and strain development during drying. In this paper, based on the defects of wood drying, the theory and experimental testing methods of drying stress and strain were summarized. Meanwhile, artificial neural networks (ANN) and their application in the wood drying field were also investigated. The traditional prong and slicing methods were used practically in the research and industry of wood drying, but the stress changes in-process cannot be trapped. The technologies of image analysis and near-infrared spectroscopy provide a new opportunity for the detection of drying stress and strain. Hence, future interest should be attached to the combination of the theory of heat and mass transfer and their coupling during drying with the theory of microscopic cell wall mechanics and macroscopic drying. A more complete image acquisition and analysis system should be developed to realize the real-time monitoring of drying strain and cracking, practically. A more feasible and reasonable prediction model of wood drying stress and strain should be established to achieve the accuracy of the prediction.

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“…Various studies on microwave treatment have been reported in the field of wood modification. The main purpose of applying microwave treatment in wood modification is to improve the permeability [1,16,17].…”

Section: Introductionmentioning

confidence: 99%

“…Weng et al [17] reported that, after pretreatment of Chinese fir lumber using a microwave, pit membranes were damaged, ray parenchyma cells and tracheids were detached, and micro-cracks in the radial section were observed. This treatment contributed to shortening of the drying time due to formation of new pathways for moisture transfer.…”

Section: Introductionmentioning

confidence: 99%

An experimental study on changes in sound absorption capability of spruce (Picea sitchensis), Douglas fir (Pseudotsuga menziesii), and larch (Larix kaempferi) after microwave treatment

Jang

Kang

2022

J Wood Sci

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This study investigated changes in the sound absorption coefficients of three anatomical sections of cubed spruce (Picea sitchensis), Douglas fir (Pseudotsuga menziesii), and larch (Larix kaempferi) after microwave treatment. Microwave treatment at 1000 W and 2.4 GHz for 20 min increased the sound absorption coefficients (at 2000–5000 Hz) of spruce by 6.9% in the transverse section, 20.0% in the radial section, and 31.7% in the tangential section. The sound absorption coefficients of Douglas fir increased by 28.9% in the transverse section, 19.1% in the radial section, and 50.0% in the tangential section. Larch coefficients increased by 16.7% in the transverse section, 37.2% in the radial section, and 38.8% in the tangential section. The sound absorption coefficients of the softwoods differed according to species and anatomical plane after microwave treatment. It was concluded that changes in the measured sound absorption coefficient indicate alteration in the pore structure of wood, which can affect in turn wood permeability and impregnation. These data will be helpful for predicting the permeability and impregnation of wood after microwave treatment.

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Effects of microwave pretreatment on drying of 50 mm-thickness Chinese fir lumber

Cited by 21 publications

References 18 publications

State of the Art of Microwave Treatment of Wood: Literature Review

State of the Art of Microwave Treatment of Wood: Literature Review

Drying Stress and Strain of Wood: A Review

An experimental study on changes in sound absorption capability of spruce (Picea sitchensis), Douglas fir (Pseudotsuga menziesii), and larch (Larix kaempferi) after microwave treatment

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