- Original Article
- Published:
In situ visualization of hardwood microcracks occurring during drying
Journal of Wood Science volume 55, pages 323–328 (2009)
Abstract
Microcracks produced in an Acacia hybrid (Acacia mangium × Acacia auriculiformis) and Melia azedarach during drying were visualized in situ using confocal laser scanning microscopy (CLSM); the morphological differences were compared. In the Acacia hybrid, numerous microcracks were found between the wood fiber and ray parenchyma, which propagated toward both the pith and bark. The microcracks closed with further drying, but persisted until the last stage of drying. In Melia azedarach, however, few microcracks formed between the wood fiber and ray parenchyma in the latewood region; they also propagated toward both the pith and bark. Because the microcracks subsequently closed, some could not be detected by CLSM. These morphological characteristics resulted from differences in the wood structure and we conclude that the interface zone between the wood fiber and ray parenchyma is one type of weak point on the transverse surface that is susceptible to checking.
References
Keey RB, Langrish TAG, Walker JCF (1999) Kiln-drying of lumber. Springer, Berlin Heidelberg New York
Kifetew G, Thuvander F, Berglund L, Lindberg H (1998) The effect of drying on wood fracture surfaces from specimens loaded in wet condition. Wood Sci Technol 32:83–94
Thuvander F, Kifetew G, Berglund LA (2002) Modeling of cell wall drying stresses in wood. Wood Sci Technol 36:241–254
Wallström L, Lindberg KAH (1999) Measurement of cell wall penetration in wood of water-based chemicals using SEM/EDS and STEM/EDS technique. Wood Sci Technol 33:111–122
Wahl P, Hanhijärvi A, Silvennoinen R (2001) Investigation of microcracks in wood with laser speckle intensity. Opt Eng 40: 788–792
Perré P (2003) The role of wood anatomy in the drying of wood: “Great oaks from little acorns grow.” Proceedings of the 8th International IUFRO Wood Drying Conference, Brasov, Romania, pp 11–24
Senft JF, Bendtsen BA (1985) Measuring microfibrillar angles using light microscopy. Wood Fiber Sci 17:564–567
Sakagami H, Tsuda K, Matsumura J, Oda K (2009) Microcracks occurring during drying visualized by confocal laser scanning microscopy. IAWA J 30:179–187
Cutter BE, Coggeshall MV, Phelps JE, Stokke DD (2004) Impacts of forest management activities on selected hardwood wood quality attributes: a review. Wood Fiber Sci 36:84–97
Alexiadis P, Cohen DH, Kozak RA, Avramidis S (2007) Kiln drying Canadian softwoods and hardwoods: different species—different problems. J Inst Wood Sci 17:259–267
Milota MR, Smith WB (1994) Contrasting drying practices for hardwoods and softwoods. Drycon: Proceedings of the Wood Technology Drying Management Conference, Vancouver, pp 1–4
Thuvander F, Berglund LA (2000) In situ observations of fracture mechanisms for radial cracks in wood. J Mater Sci 35:6277–6283
Dill-Langer G, Lütze S, Aicher S (2002) Microfracture in wood monitored by confocal laser scanning microscopy. Wood Sci Technol 36:487–499
Debaise GR, Porter AW, Pentoney RE (1966) Morphology and mechanics of wood fracture. Mater Res Stand 6:493–499
Korán Z (1967) Electron microscopy of radial tracheid surfaces of black spruce separated by tensile failure at various temperatures. TAPPI 50:60–67
Côté WA, Hanna RB (1983) Ultrastructural characteristics of wood fracture surfaces. Wood Fiber Sci 15:135–163
Zink AG, Pelikane PJ, Shuler CE (1994) Ultrastructural analysis of softwood fracture surfaces. Wood Sci Technol 28:329–338
Putoczki TL, Nair H, Butterfield B, Jackson SL (2007) Intra-ring checking in Pinus radiata D. Don: the occurrence of wall fracture, cell collapse, and lignin distribution. Trees-Struct Funct 21:221–229
Nakato K (1958) On the cause of the anisotropic shrinkage and swelling of wood. VII. On the anisotropic shrinkage in transverse section of the isolated springwood and summerwood (in Japanese). Mokuzai Gakkaishi 4:94–100
Pentoney RE (1953) Mechanisms affecting tangential vs. radial shrinkage. J Forest Prod Res Soc 3:27–32
Ma Q, Rudolph V (2006) Dimensional change behavior of Caribbean pine using an environmental scanning electron microscope. Dry Technol 24:1397–1403
Author information
Authors and Affiliations
Corresponding author
Additional information
Part of this report was presented at the 57th Annual Meeting of the Japan Wood Research Society, Hiroshima, Japan, August 2007, at the 25th Annual Meeting of the Wood Technological Association of Japan, Asahikawa, Japan, September 2007, at the 15th Annual Meeting of Japan Wood Research Society Kyusyu Branch, Oita, Japan, July 2008, and at the 9th Pacific Rim Bio-Based Composites Symposium, Rotorua, New Zealand, November 2008
Rights and permissions
About this article
Cite this article
Sakagami, H., Matsumura, J. & Oda, K. In situ visualization of hardwood microcracks occurring during drying. J Wood Sci 55, 323–328 (2009). https://doi.org/10.1007/s10086-009-1041-5
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10086-009-1041-5