Effect of drying method as a pretreatment on CUAZ preservative impregnation in Japanese cedar logs

Momohara, Ikuo; Saito, Shuetsu; Ohmura, Wakako; Kiguchi, Makoto

doi:10.1007/s10086-009-1056-y

Cited by 9 publications

(4 citation statements)

References 5 publications

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“…Problems with sapwood permeability for C. japonica kiln-dried logs have gained special attention due to deterioration of durability in Japan. The preservative penetration of air-dried logs is significantly better than that of the kiln-dried logs (Momohara et al 2009). Although the details are not specified, the cause is likely the different log drying conditions.…”

Section: Introductionmentioning

confidence: 96%

“…Studies on the relationship between fluid flow and drying conditions have contradictory results after high temperature drying, reporting enhanced permeability (Booker and Evans 1994;Terziev 2002;Terziev and Daniel 2002;Zhang and Cai 2008;Taghiyari 2013) or poor permeability (Comstock and Côté 1968;Thompson 1969;Momohara et al 2009;Taghiyari et al 2014). Even by thermal treatment at high temperature, the opposite results were reported (Ahmed and Morén 2012; Ahmed et al 2013a,b).…”

Section: Introductionmentioning

confidence: 99%

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Effects of Drying Temperature for Cryptomeria japonica on the Permeability of Wood Preservative. II: The Permeability of Dried, Split Log Pieces

Sakagami¹,

Tokunaga²,

Fujimoto³

et al. 2016

BioResources

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e Poor impregnation of sapwood from Cryptomeria japonica kiln-dried logs is a problem for preservative treatment in Japan. The permeability of copper azole (CuAz) into sapwood was reported to decrease with an increase in the drying temperature of logs, due in part to the presence of bordered pits. However, damaged and aspirated bordered pits appeared abundantly at 100 °C and 120 °C, although the difference in permeability was very little. To investigate this phenomenon, two types of smaller split log pieces, one containing both heartwood and sapwood, and the other containing sapwood without heartwood, were dried at 20 °C to 120 °C to test higher drying conditions. Results were similar to those of the dried logs. However, the impregnation and penetration at 80 °C were the lowest, and those at 100 °C and 120 °C were greater than the dried logs. Additionally, the number of damaged bordered pits on dried, split samples was generally higher than that of dried logs, as observed with scanning electron microscopy. Bioresource and Bioenvironmental Sciences, Kyushu University, 6-10-1 Hakozaki Higashiku Fukuoka, 812-8581, Japan; c: Division of Forest Environment Sciences, Faculty of Agriculture, Kyushu University, 394 Tsubakuro Sasaguri Fukuoka, 812-2415, Japan; d: Department of Wood Processing and e: Department of Research Planning and Coordination, Forestry and Forest Products Research Institute, 1 Matsunosato, Tsukuba, Ibaraki, 305-8687 Japan; * Corresponding author: h-sakagami@agr.kyushu-u.ac.jp Keywords INTRODUCTIONCryptomeria japonica D. Don is the most popular domestic commercial wood in Japan, and its effective utilization is important. Recently, small logs and sawn timbers have been used for civil engineering (Kamiya 2003;Kubojima et al. 2012;Noda et al. 2014). Most woods destined for these uses are treated with wood preservative. However, it is difficult to impregnate the timber evenly with preservative due to non-uniform permeability by some factors. (Erickson 1970;Flynn 1995). Problems with sapwood permeability for C. japonica kiln-dried logs have gained special attention due to deterioration of durability in Japan. The preservative penetration of air-dried logs is significantly better than that of the kiln-dried logs (Momohara et al. 2009). Although the details are not specified, the cause is likely the different log drying conditions. Fluid flow in softwoods, both sapwood and heartwood, is generally related to the shape, size, and conditions of pits in tracheids. According to Fujii et al. (1997), air permeability has an obvious negative correlation with the pit aspiration ratio in samples collected from sapwood, transition zone between sapwood and heartwood, and heartwood.PEER-REVIEWED ARTICLE bioresources.com Sakagami et al. (2016). "Permeability of split log," BioResources 11(3), 6896-6908. 6897Fluid flow is clearly influenced by drying conditions. Studies on the relationship between fluid flow and drying conditions have contradictory results after high temperature drying, reporting enhanced perme...

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Effects of Drying Temperature for Cryptomeria japonica on the Permeability of Wood Preservative. II: The Permeability of Dried, Split Log Pieces

Sakagami¹,

Tokunaga²,

Fujimoto³

et al. 2016

BioResources

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“…With this in mind, many investigative studies have been carried out regarding efforts to prolong the service life of wooden products [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Assessment of decay risk of airborne wood-decay fungi II: relation between isolated fungi and decay risk

et al. 2011

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The relationship between the taxa of airborne fungi and the decay risk was investigated. Airborne fungi in 1,000 l of air were trapped on Japanese cedar disks, and incubated in a damp container kept at 268C. After 16-week incubation, filamentous fungi grown on the disks were isolated and DNA extracted from each isolate was amplified with the primers ITS4/ITS5. The DNA sequences of the amplified products were determined and compared to the sequence data of GenBank to determine the species or genus according to a BLAST search. This search revealed that the isolate consisted of 5 major taxa, namely Bjerkandera sp., Phanerochaete sp. (A), Phanerochaete sp. (B), Polyporales sp. Polyporus arcularius, and 6 minor ones. Statistical analysis revealed that the major taxa were trapped on the disks in similar weather conditions except for Bjerkandera sp., which was trapped at a cooler temperature. The analysis also proved the disks to which Phanerochaete spp. or Polyporales sp. were attached showed higher mass loss. It is concluded that, under these experimental conditions, related species of Phanerochaete sordida play an important role in increasing the decay risk caused by airborne wood-decay fungi.

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“…Dried, preservative-treated C. japonica logs decay because of poor impregnation in sapwood; this problem has recently gained attention in Japanese companies. By comparing the preservative penetration in airdried and kiln-dried C. japonica logs, Momohara et al (2009) found that the preservative penetration of air-dried logs was significantly better. While poor penetration may be due to the different drying conditions, the details are unclear.…”

Section: Introductionmentioning

confidence: 99%

Effects of drying temperature for Cryptomeria japonica on the permeability of wood preservative I. The permeability of dried logs

et al. 2016

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e Wood preservative treatments are indispensable for wood used in severe environmental conditions. Decay occurs in preservative-treated woods due to the poor impregnation of sapwood; this problem has recently gained attention for Cryptomeria japonica kiln-dried logs. To clarify the causes of this phenomenon, the influence of drying temperature on the penetration of preservative into sapwood logs was investigated. Sapwood samples taken from logs dried at 20 °C to 120 °C were impregnated with copper azole (CuAz). The bordered pits of these samples were observed by scanning electron microscopy (SEM). These results revealed that CuAz absorption decreased with increased drying temperature. The CuAz penetration was deepest for the samples dried at 20 °C. The occurrence of neutral-position bordered pits tended to decrease with increasing drying temperature. These results indicated that there is a strong relationship between the drying temperature and the appearance of bordered pits. Furthermore, the preservative permeability decreased with increasing drying temperature. This result implies that one factor restraining fluid permeability is the aspiration of bordered pits.

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Effect of drying method as a pretreatment on CUAZ preservative impregnation in Japanese cedar logs

Cited by 9 publications

References 5 publications

Effects of Drying Temperature for Cryptomeria japonica on the Permeability of Wood Preservative. II: The Permeability of Dried, Split Log Pieces

Effects of Drying Temperature for Cryptomeria japonica on the Permeability of Wood Preservative. II: The Permeability of Dried, Split Log Pieces

Assessment of decay risk of airborne wood-decay fungi II: relation between isolated fungi and decay risk

Effects of drying temperature for Cryptomeria japonica on the permeability of wood preservative I. The permeability of dried logs

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