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Journal of Wood Science

Official Journal of the Japan Wood Research Society

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Volume 55 Supplement 6

Special Issue on Wood Science and Technology for Mitigation of Global Warming

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

Journal of Wood Science volume 55, pages 441–445 (2009)Cite this article

Abstract

Green Japanese cedar logs 2 m in length and 18 cm in diameter were dried to a mean moisture content of less than 30% by either air drying or kiln drying. Dried logs were impregnated with copper azole (CUAZ) solution according to Japanese Industrial Standard (JIS) A9002. Preservative absorption was calculated from the log weight before and after preservative impregnation. Impregnated logs were then dried in the air and cut at the center to determine preservative penetration. The penetration area was determined after visualizing the preservative with chrome azurol S. The visualized area indicated that the preservative solution penetrated into the sapwood portion of almost all the air-dried logs. However, the kiln-dried logs did not show full penetration into the sapwood portion. The visualized area of some kiln-dried sapwood showed a penetration value of less than 80%, which is the minimum requirement set by the Japanese Agricultural Standard (JAS) for sawn timber. Statistical analysis showed that penetration in the air-dried sapwood was significantly better than that in the kiln-dried sapwood. It was concluded that air drying is more favorable than kiln drying as the predrying method for CUAZ impregnation. On the other hand, preservative absorption was not affected by the drying method.

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Authors and Affiliations

  1. Forestry and Forest Products Research Institute, 1 Matsunosato, Tsukuba, 305-8687, Japan

    Ikuo Momohara, Shuetsu Saito, Wakako Ohmura & Makoto Kiguchi

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  1. Ikuo Momohara
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  2. Shuetsu Saito
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  3. Wakako Ohmura
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  4. Makoto Kiguchi
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Correspondence to Ikuo Momohara.

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Momohara, I., Saito, S., Ohmura, W. et al. Effect of drying method as a pretreatment on CUAZ preservative impregnation in Japanese cedar logs. J Wood Sci 55, 441–445 (2009). https://doi.org/10.1007/s10086-009-1056-y

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  • DOI: https://doi.org/10.1007/s10086-009-1056-y

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