A Preliminary Study on Ultrasonic Treatment Effect on Transverse Wood Permeability

Tanaka, Takashi; Avramidis, Stavros; Shida, Satoshi

doi:10.4067/s0718-221x2010000100001

Cited by 28 publications

(21 citation statements)

References 3 publications

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“…The tangential air permeability of sugi was lower than that of Pinus, Sequoia, Juniperus, Abies and Tsuga. Figure 7 compares the mean longitudinal specific permeability of sugi determined in the present study and that of other softwoods measured with gas (Resch and Echlund 1964, Choong and Fogg 1968, Comstock 1970, Kawabe and Mori 1981, Perré 1987, Matsumura et al 1994, Fujii et al 1997, Lihra et al 2000, Perré 2007, Tanaka et al 2010. Here, the permeabilities of Cryptomeria japonica, Tsuga heterophylla Chamaecyparis obtusa and Chamaecyparis taiwanensis were calculated according to the equation suggested by Kawabe and Mori (1981) for a sample thickness of 10 mm.…”

Section: Methodsmentioning

confidence: 99%

“…Many studies have revealed the permeability of various softwoods such as Pinus (Choong andFogg 1968, Perré 1987), Picea (Perré 1987), Larix (Matsumura et al 1994), Pseudotsuga (Tanaka et al 2010), Abies (Lihra et al 2000), Tsuga (Kawabe and Mori 1981, Kawabe and Mori 1985, Rayirath and Avramidis 2008, Sequoia (Resch andEchlund 1964, Choong andFogg 1968), Chamaecyparis Mori 1981, Kawabe andMori 1985), and Juniperus (Choong and Fogg 1968). All these data were measured with gases and with dried wood specimens.…”

Section: Introductionmentioning

confidence: 99%

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Air permeability of sugi (Cryptomeria japonica) wood in the three directions

Tanaka

Kawai

Sadanari

et al. 2015

Maderas, Cienc. tecnol.

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To investigate the air permeability of sugi (Cryptomeria japonica) and the effect of grain directions on it, the air permeabilities of air-dried sugi sapwood and heartwood were determined along the three material directions of wood. The value of the longitudinal permeability was the highest and that of the radial permeability was the lowest. The permeability of heartwood was about an order of magnitude less than the permeability of sapwood in the same direction. The ratio between the tangential and radial permeability was approximately 10, which was similar to softwoods that have impermeable rays. These results suggest that sugi has ray tissues that are either impermeable or have very low permeability. The radial permeability of sugi was much lower than that of Pinus, Sequoia, Juniperus, Abies and Tsuga measured with gases reported in the literature, indicating that sugi is one of the least radially permeable softwoods. These findings explain the reasons for the difficulties encountered in the drying and chemical treatment of sugi (Cryptomeria japonica).

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Air permeability of sugi (Cryptomeria japonica) wood in the three directions

Tanaka

Kawai

Sadanari

et al. 2015

Maderas, Cienc. tecnol.

Self Cite

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“…Recently, ultrasonic treatments have been used to improve wood permeability, such as in the aspects of wood drying, extraction, and impregnation by some researchers [21][22][23][24]. However, there are only a handful of studies on the application of ultrasonic-assisted wood dyeing.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of ultrasonic-assisted dyeing properties of fast-growing poplar wood treated by reactive dye based on grey system theory analysis

Wang

Zhang

et al. 2018

J Wood Sci

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Ultrasonic-assisted dyeing as a novel and eco-friendly method was utilized to improve decorative value of fast-growing tree species. The effects of ultrasonic-assisted dyeing parameters (e.g., temperature, dye concentration, ultrasonic power, dipping time, dyeing assistant and dye-fixing agent) on the properties of wood were investigated, and the parameters were optimized. Moreover, the main factors mentioned above were determined with grey system theory analysis. Analyses of chemical structure, thermostability, crystallinity, and microscopic morphologies were conducted using fourier transform infrared spectroscopy (FTIR), thermogravimetric (TG), X-ray diffraction (XRD), and scanning electron microscope (SEM), respectively. Results showed that dye uptake and K/S were influenced by the parameters in the following order: dye concentration > dye-fixing agent > dyeing assistant > dipping time > ultrasonic power > temperature. FTIR indicated that an ether bond was formed between the wood component and the reactive dye. TG and XRD demonstrated that the thermal stability and crystallinity of ultrasonic-assisted dyed wood were both improved. SEM revealed that dye molecules diffused into the cell cavity, wood vessel, aperture, and part of the wood microstructure such as pit membrane, which was mechanically damaged after the ultrasonic-assisted dyeing treatment and created new fluid channels for the dye.

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“…In recent years, ultrasound has been implemented as an alternative pretreatment method for wood drying; this pretreatment greatly reduces the overall processing time (He et al 2012(He et al , 2014 due to the following factors: increased mass transfer rate (García-Pérez et al 2009Xu et al 2009;Cárcel et al 2011), increased effective water diffusivity (Bantle and Eikevik 2011;He et al 2012), increased wood specific permeability coefficient (Tanaka et al 2010), loss of cellular adhesion, formation of large cellular interspaces, ruptured cell walls, and formation of large channels (García-Pérez et al 2009). However, few reports so far have addressed the influence of ultrasound pretreatment on the dimensional stability of wood.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Ultrasound Pretreatment on Poplar Wood Dimensional Stability

Shu

Wang

et al. 2016

BioResources

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Dimensional stability is a key property of wood that significantly affects its applications. The effect of an ultrasound pretreatment on poplar wood (Populous tomentosa) dimensional stability was examined. During the pretreatments, wood samples were immersed in distilled water and treated ultrasonically under three different powers and frequencies. The samples were then analyzed by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The chemical transformation of the cell-wall material was studied and then associated with the change of water absorption and the swelling coefficient. The results showed that the water absorption decreased after the ultrasonic pretreatment. The axial and radial swelling coefficients of the pretreated samples decreased, while the tangential swelling coefficients increased. The volumetric swelling coefficient of pretreated specimens fluctuated near 4.48% (the volumetric swelling coefficient of untreated wood). Ultrasonic pretreatment increased the number of hydrophilic groups, such as the hydroxyl, acetyl, and uronic ester groups. Meanwhile, the pretreatment also increased the degree of crystallinity and reduced the available polar groups. These two factors together caused the change of the moisture absorption and the swelling coefficient of the pretreated wood. These conclusions suggest that the ultrasonic pretreatment is a promising method for further chemical modification of wood.

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A Preliminary Study on Ultrasonic Treatment Effect on Transverse Wood Permeability

Cited by 28 publications

References 3 publications

Air permeability of sugi (Cryptomeria japonica) wood in the three directions

Air permeability of sugi (Cryptomeria japonica) wood in the three directions

Evaluation of ultrasonic-assisted dyeing properties of fast-growing poplar wood treated by reactive dye based on grey system theory analysis

The Effect of Ultrasound Pretreatment on Poplar Wood Dimensional Stability

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