Internal-check variation in boxed-heart square timber of sugi (Cryptomeria japonica) cultivars dried by high-temperature kiln drying

Yamashita, Kana; Hirakawa, Yasuhiko; Saito, Shuetsu; Ikeda, Motoyoshi; Ohta, Masamitsu

doi:10.1007/s10086-012-1272-8

Cited by 8 publications

(2 citation statements)

References 10 publications

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“…Specifically, the length of the cracks displayed a direct proportionality to the radial shrinkage. Moreover, internal cracking near the pith was found to be relatively severe, largely due to the impact of radial shrinkage [ 64 , 65 ]. Phonetip et al compared two internal check measurement methods for wood drying quality assessment [ 66 ].…”

Section: Study On the Law Of Wood Deformation And Crackingmentioning

confidence: 99%

Review on Wood Deformation and Cracking during Moisture Loss

Chen

Zhang

et al. 2023

Polymers

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Wood, being a natural hygroscopic material, the interaction between wood and moisture plays a crucial role in wood processing and utilization. Moisture affects the physical and mechanical properties of wood, and is also one of the main external factors that cause wood deformation and cracking. Drying shrinkage is a common phenomenon during the processing and utilization of wood induced by moisture loss. Drying stress is the main cause of wood deformation and cracking. The shrinkage differential between tangential and radial direction and moisture content gradient of wood are two reasons induced the generation of drying stresses. In this review, the existing states of moisture in wood and the interaction between water molecules and wood components were systematically summarized. The current research progress and deficiencies in three aspects including the factors resulted in deformation and cracking in wood caused by moisture loss, the correlation between wood mechanical properties and moisture, as well as the development of deformation and cracking in wood under moisture loss were discussed. This review aims to facilitate further research on the deformation and cracking of wood under moisture loss by providing valuable insights and assistance, ultimately reducing the occurrence of wood deformation and cracking. And thus, it will enhance the overall utilization of wood resources, making wood better serve human life.

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Section: Study On the Law Of Wood Deformation And Crackingmentioning

confidence: 99%

Review on Wood Deformation and Cracking during Moisture Loss

Chen

Zhang

et al. 2023

Polymers

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“…Most lumbers are usually exposed under high-temperature conditions at around 1008C in the case of kiln-drying processes in the Japanese wood industry. For example, temperatures above 1008C are commonly given as the predrying treatment for boxed-heart timber of softwood species, such as Japanese cedar and hinoki cypress, after steaming at around 908C for the purpose of suppressing surface checks (Yoshida et al 2000(Yoshida et al , 2004Kuroda 2007;Yamashita et al 2012). However, a few studies obtained detailed information about the effects of drying temperature on the occurrence of sticker stain under such severe conditions, even though the market for wood products in Japan demands better appearance, such as structural lumber without checks in all lateral surfaces.…”

mentioning

confidence: 99%

Effects of Drying Temperatures on the Occurrence of Sticker Stain in Japanese Cedar (Cryptomeria japonica D. Don)

Toba¹,

Kanbayashi²,

Murano³

2021

Forest Products Journal

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Sticker stain is a material defect that results from moisture migration during wood drying, often spoiling the appearance of the surface of wood products. The effect of drying temperatures on the occurrence of surface sticker stain was investigated using Japanese cedar (Cryptomeria japonica D. Don) and three types of stickers (air-dried Japanese cedar, aluminum, and stainless steel) under four drying temperatures (20°C, 50°C, 75°C, and 100°C). At lower drying temperatures, the air-dried wood sticker tended to suppress the occurrence of surface sticker stains, whereas higher temperature or metal stickers produced sticker stains with deep color. However, no definitive relation was shown between the initial moisture content and the extent of sticker stain with deep color regardless of drying temperatures. It was considered that the partial delay of drying happened around the contact area with stickers, especially in cases of metal stickers. It was also found that the use of metal stickers at higher drying temperatures induced depressions in Fourier transform infrared spectra related to the occurrence of hygrothermal conditions.

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