Effects of microwave post-treatments on leaching resistance of ACQ-D treated Chinese fir

Yu, Lili; Gao, Wei; Cao, Jinzhen; Tang, Zhenzhong

doi:10.1007/s11632-010-0008-3

Cited by 6 publications

(9 citation statements)

References 6 publications

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“…However, the increasing effects of microwave post-treatment on leaching resistance of copper-based preservatives were previously reported (Zhang & Kamdem 2000, Cao & Kamdem 2004, Yu et al 2010). Therefore, further complementary studies should be done to understand these contradictions.…”

Section: Discussionmentioning

confidence: 92%

Improving impregnation properties of fir wood to acid copper chromate (ACC) with microwave pre-treatment

Ramezanpour¹,

Tarmian²,

Taghiyari³

2015

iForest

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© iForest -Biogeosciences and Forestry IntroductionSpecies with low wood permeability, such as fir (Abies alba L.), cause many problems during the wood impregnation process with preservatives. Fir is a gymnosperm species with torus margo pit membrane; the low permeability is mainly due to the pit aspiration during drying. Different modification methods, such as steaming, mechanical incising, drilling techniques and bio-incising were tested to improve the impregnation properties of such refractory wood species (Schwarze et al. 2006, Lehringer et al. 2009, Dashti et al. 2012a. Microwave (MW) radiation is an innovative method to increase the wood permeability and thus to improve the preservative penetration in the wood of various species (Vinden et al. 2003, Brodie 2009, Torgovnikov & Vinden 2009, Dashti et al. 2012b). Due to the high efficiency in converting electricity into microwave radiation, energy saving, in-depth heating of materials and reduced costs, microwave pretreatment is spreading in many industries (Torgovnikov & Vinden 2010). The increasing effect of microwave radiation on the wood permeability was reported to be due to changes in the wood porous structure (Lu et al. 1994, Zhao et al. 1998, Yu et al. 2002. Torgovnikov & Vinden (2009) mentioned that when the microwave energy was applied to wood, the steam pressure generated within the wood cells provokes the rupture of the pit membranes on cell walls and the weak ray cells, allowing an easier fluid transfer. Liu et al. (2005) reported that the permeability of larch wood can be improved without noticeable reduction in the strength and stiffness if the conditions of microwave pretreatment were optimized. Treu & Gjolsjo (2008) also reported that the microwave processing of Norway spruce (Picea abies L.) caused a significant increase in the uptake of a 2% copper-based preservative after wood modification by microwave energy of more than 50 kWh/m 3 at a frequency of 2.45 GHz. Hong-Hai et al. (2005) also found that the water uptake of Larch (Larix olgensis) wood irradiated by microwave was 2.5 to 3.3 times greater than that of non-radiated wood. Dashti et al. (2012b) found that the microwave radiation of fir wood (Abies alba L.) at frequency of 2.45 GHz for 7 and 10 minutes can increase the wood radial permeability. They also reported that the torus of some bordered pits was hydrolyzed due to the microwave radiation; however, they did not study the relationship of MW pre-treatment on the amount of preservative uptake, depth of penetration, or other impregnation properties. This species is vastly grown in different parts of the world and therefore provide a continuous raw material for commercial applications; huge amount of fir lumbers are also imported to Iran on a regular basis to satisfy the growing needs for commercial woods. Because of the importance of fir species in timber industry and its various applications, the present research was carried out to evaluate the effects of microwave radiation conditions on the impregnation properties of fir wood (Ab...

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Section: Discussionmentioning

confidence: 92%

Improving impregnation properties of fir wood to acid copper chromate (ACC) with microwave pre-treatment

Ramezanpour¹,

Tarmian²,

Taghiyari³

2015

iForest

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“…Microwave (MW) modification of wood has been used in experiments for drying (Hansson and Antti 2003), pre-drying (Awoyemi 2004;Beikircher et al 2012;Harris et al 2008), better fixation of impregnation agents in the wood structure (Yu et al 2009), better permeability and impregnability (Torgovnikov and Vinden 2009), and to achieve plasticization (Studhalter et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Microwave Device for Continuous Modification of Wood

Koiš¹,

Dömény²,

Tippner³

2014

BioResources

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The aims of this study were to introduce a new laboratory microwave device developed for the modification of wood properties and to examine the effect of microwave radiation on moisture loss, surface temperature, and mechanical properties (the static modulus of elasticity-MOE, and the modulus of rupture-MOR) of Norway spruce (Picea abies). The device was developed for a continuous modification process. The microwave (MW) generator works at a frequency of 2450 MHz, and the adjusted output ranges from 0.6 to 6 kW. The experiment was based on four different modes of MW modification, each of them with a varied generator output and conveyor speed. Regarding mechanical properties, the results showed that a feasible output for the MW modification of the samples was up to 3 kW, with a conveyor speed of around 0.4 m/min. The greatest moisture loss, approximately 40%, was found in the group treated at 5 kW and 0.2 m/min. The highest surface temperature, 87 °C, was measured in the group treated at 5 kW and 0.4 m/min after the second passage through the modification chamber.

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“…Hexavalent chromium will be entirely fi xed after being exposed to temperatures of 110 °C at a frequency of 13.56 MHz for fi ve hours without having any negative impacts on the quality of the wood. With the aid of a better chamber design, fi xation time can also be cut more drastically [55]. Copper is fi xed in wood as a result of conversion of Cu-II (divalent copper) to Cu-I (monovalent copper) [45].…”

Section: Impact Of Microwave Treatment On Permeability Of Woodmentioning

confidence: 99%

Effect of Microwave Treatment on Strength and Permeability of Wood: A Snapshot Review

Sharma,

Kumar

2023

J Biomed Res Environ Sci

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Microwave treatment is a promising technique for modifying the properties of wood. It has gained popularity as an alternative method to conventional treatments for improving the properties of wood. Microwave drying has shown that it reduces the drying stresses and improve the quality of wood compared to traditional drying methods. This efficient heating reduces the risk of deformation, cracking, and other defects that can occur with prolonged exposure to high temperatures during traditional drying and also helps in increasing the permeability of wood. This snapshot review provides an overview of the effect of microwave treatment on the strength properties and permeability of wood with variations in parameters such as the frequency, power, and treatment time along with the potential benefits and drawbacks of this method. Overall, the review indicate that microwave treatment is an effective method for modifying the properties of wood and has the potential to improve its performance in various applications.

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Effects of microwave post-treatments on leaching resistance of ACQ-D treated Chinese fir

Cited by 6 publications

References 6 publications

Improving impregnation properties of fir wood to acid copper chromate (ACC) with microwave pre-treatment

Improving impregnation properties of fir wood to acid copper chromate (ACC) with microwave pre-treatment

Microwave Device for Continuous Modification of Wood

Effect of Microwave Treatment on Strength and Permeability of Wood: A Snapshot Review

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