Effect of cross-sectional dimensions on bow and surface checking of sugi (Cryptomeria japonica) boxed-heart square timber dried by conventional kiln drying

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

doi:10.1007/s10086-013-1380-0

Cited by 8 publications

(5 citation statements)

References 10 publications

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“…Moreover, for square lumber drying, Yamashita et al found that larger cross-sectional dimensions were associated with more severe surface cracking in Japanese cedar ( Cryptomeria japonica ) lumber. This was attributed to the greater moisture content gradient between the heartwood and sapwood regions in larger cross-sectional dimensions of the lumber [ 51 ].…”

Section: Causes Of Wood Deformation and Cracking During Dryingmentioning

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: Causes Of Wood Deformation and Cracking During Dryingmentioning

confidence: 99%

Review on Wood Deformation and Cracking during Moisture Loss

Chen

Zhang

et al. 2023

Polymers

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“…In addition, a number of internal factors within the wood being dried also have potential contribution to the defects development. One of those is the dimension of the sample which could affect the susceptibility of wood to several drying defects such as checking or deformation (Yamashita et al, 2014).…”

Section: Results and Discussion A High Temperature Drying Propementioning

confidence: 99%

High temperature drying properties and basic drying schedule of 5 lesser-known species from Riau

Yuniarti¹,

Basri²

2017

JPKW

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Drying process is a crucial stage in the utilization of any wood for construction and furniture purposes. The study aimed to: (i) investigate the sensitivity of several lesser-known wood species from natural forest in Riau to drying process at high temperature; and (ii) develop basic drying schedule for each wood. Five lesser-known species from Riau were investigated, namely punak (Tetramerista glabra), mempisang (Diospyros korthalsiana), pasak linggo (Aglaia argentea), meranti bunga (Shorea teysmanniana) and suntai (Palaquiumburckii). Modified Terazawa's (1965) method was used for the experiment. The result shows that deformation was found for all species. The most severe deformation level was observed for both punak (score value of 4-6) and mempisang (score value of 4-5). On the other hand, pasaklinggo experienced the most severe initial end/surface check/split (score value of 6) and honeycombing (score value of 5). The result also showed that punak and pasaklinggo can be dried with the same drying schedule at the temperature range of 40-65° C and the humidity range of 38-88%. The proposed temperature and humidity ranges (or drying schedules) are 50-80° C and 28-80% for suntai, 50-70° C and 25-80% for mempisang, and 50-70° C and 40-84% for meranti bunga. Mempisang and suntai can use the same drying condition until fiber saturation point, then different drying condition applies.

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“…Shrinkage is initiated by a change in MC and leads to the development of drying stresses, such as creep, tension set, and twisting stress (Kubojima et al 2013). The creep and tension set are greatly affected by drying time and develop differently depending on species, type, thickness, and heart/sapwood ratio (Hwang and Park 2009;Yamashita et al 2014;Lee et al 2016c).…”

Section: Surface Checksmentioning

confidence: 99%

Effects of knife-incising and longitudinal kerfing pretreatments on high-temperature drying of red pine and pitch pine timbers

Lee

Eom

2021

BioRes

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Effects of knife-incising and longitudinal kerfing pretreatments were analyzed relative to the high-temperature drying of red pine and pitch pine timbers with cross-sections less than 15 cm. Specimens were prepared as round and square timbers with thicknesses of 9, 12, and 15 cm. They were divided into four groups: control, longitudinal kerf, knife-incised, and a combination of knife-incised and longitudinal kerf. Some results from this study, such as commercial availability and application methods of drying schedules, have immense commercial importance. The incising and kerfing treatment can be used not only to improve drying quality but also as a tool for deriving an optimal drying schedule. The kerfing treatment noticeably reduced the surface checks in square timber. However, the incising treatment caused a phenomenon in which the incisions connect to each other and develop into surface checks. The wood characteristics, such as species, type, thickness, and initial MC, had more influence on determining the drying defects than the pretreatments. For the commercial use of the drying schedule used in this study, it can be useful to determine the appropriate drying time in the third step according to the species, thickness, and shape.

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Effect of cross-sectional dimensions on bow and surface checking of sugi (Cryptomeria japonica) boxed-heart square timber dried by conventional kiln drying

Cited by 8 publications

References 10 publications

Review on Wood Deformation and Cracking during Moisture Loss

Review on Wood Deformation and Cracking during Moisture Loss

High temperature drying properties and basic drying schedule of 5 lesser-known species from Riau

Effects of knife-incising and longitudinal kerfing pretreatments on high-temperature drying of red pine and pitch pine timbers

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