Temporal Change in Surface-strain Distribution of Sugi (&lt;i&gt;Cryptomeria japonica&lt;/i&gt;) Square Timber during High-Temperature Drying

Murano, Tomoya; Fujimoto, Noboru; Sakagami, Hiroki; Watanabe, Ken

doi:10.2488/jwrs.66.140

Cited by 1 publication

(3 citation statements)

References 7 publications

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“…Surface strains showed similar values between the two detection methods. Three of the four surfaces (surfaces A, B, and C) showed contraction behaviors especially in the middle part during the early steaming stages, such as 2 h. These contraction behaviors coincided with previous studies (Toba et al 2018;Murano et al 2020). These initial contraction behaviors gradually decreased, as represented by the comparison between the second and third rows of surface B.…”

Section: Changes In the Surface Strain During Steamingsupporting

confidence: 89%

“…They suggested that the drying time can be shortened by controlling the drying schedule based on actual surface strain conditions. Similar studies have also been conducted on the drying of boxed-heart timbers of Japanese cedar (Toba et al 2018;Murano et al 2020). In particular, Murano et al (2020) visualized the two-dimensional in-plane distribution of surface strains based on the image analytical method (Murata 2005), and the obtained results coincided with a numerical simulation (Nakao 2002).…”

Section: Introductionsupporting

confidence: 58%

“…Similar studies have also been conducted on the drying of boxed-heart timbers of Japanese cedar (Toba et al 2018;Murano et al 2020). In particular, Murano et al (2020) visualized the two-dimensional in-plane distribution of surface strains based on the image analytical method (Murata 2005), and the obtained results coincided with a numerical simulation (Nakao 2002). However, the above studies detected only one lateral surface due to the measuring equipment.…”

Section: Introductionsupporting

confidence: 58%

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Temporal changes in strain condition on all lateral surfaces during pretreatment before timber drying

Toba

Nakai

Murano

2023

BioRes

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Wood drying, such as boxed-heart square timber, often involves surface checks, which spoils the appearance of wood products and reduces their market value. Pretreatments are performed to avoid the surface checks, but detailed information about surface strain during timber drying remains unclear. In this study, surface strain detections were performed using two types of strain sensors (strain gauge and optical fiber strain sensor) to understand the surface dimensional changes during a series of pretreatments, consisting of steaming and high temperature and low humidity treatment. Simultaneous strain measurements based on the optical fiber sensor grasped the surface strain distributions in each lateral surface during timber drying; contraction behaviors were observed in the middle part of most surfaces in the early steaming stage, while one surface showed expansion. A remarkable expansion was detected in one surface during the high temperature and low humidity treatment, although most of the other surfaces showed gradual contraction behaviors. It was also discovered that the above detected behaviors were gradually reduced with the progress of each pretreatment.

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Section: Changes In the Surface Strain During Steamingsupporting

confidence: 89%