[논문]Specific Gravity and Dimensional Stability of Boron-Densified Wood on Three Lesser-Used Species from Indonesia

AUGUSTINA, Sarah; WAHYUDI, Imam; DARMAWAN, I Wayan; MALIK, Jamaludin; BASRI, Efrida; KOJIMA, Yoichi

doi:10.5658/wood.2020.48.4.458

Specific Gravity and Dimensional Stability of Boron-Densified Wood on Three Lesser-Used Species from Indonesia 원문보기

목재공학 = Journal of the Korean wood science and technology, v.48 no.4, 2020년, pp.458 - 471

AUGUSTINA, Sarah (Forest Products Science and Technology Study Program, IPB University) , WAHYUDI, Imam (Forest Product Department, Faculty of Forestry, IPB University) , DARMAWAN, I Wayan (Forest Product Department, Faculty of Forestry, IPB University) , MALIK, Jamaludin (Forest Products Research and Development Agency (FORDA)) , BASRI, Efrida (Forest Products Research and Development Agency (FORDA)) , KOJIMA, Yoichi (Wood Biomass Utilization Department, Faculty of Agriculture, Shizuoka University)

Abstract ▼ AI-Helper

Effect of pre-treatment and compression ratio on specific gravity (SG) and dimensional stability improvement of three lesser-used wood species from natural forest area of North Kalimantan Province, Indonesia had been investigated. Hot soaking at 80℃ for 3 hours within 2 and 5% of boron solution was applied as pre-treatment, while compression ratio applied was 20 and 40% from the initial thickness. Densification was conducted using hot pressing machine at 30 kg/㎠ of pressure and 160℃ of temperature for 15 minutes. Specific gravity was measured gravimetrically, while dimensional stability was evaluated through thickness swelling and water absorption as the indicator. Results show that SG of densified wood was influenced by wood species and compression ratio, but not by pre-treatment applied; while dimensional stability was influenced by wood species, compression ratio, and pre-treatment. Specific gravity and water absorption of densified wood was improved significantly. Specific gravity increased 28.86-63.03%, while water absorption decreased 12.80-15.89%. Thickness swelling of 20% densified wood was lower than that of 40% densified wood.

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표/그림 (13)

그림 Fig. 1. Sample size before and after densification: (a) 20% of compression ratio (b) 40% of compression ratio.
표 Table 1. Treatment used in this study
표 Table 2. Specific gravity of three wood species
그림 Fig. 3. Specific gravity enhancement of three wood species at different boron concentrations and different compression ratios.
그림 Fig. 2. Boron penetration observed with Scanning Electron Microscope: (a) nyatoh, 370x magnification, (b) pisang putih, 350x magnification, and (c) sepetir, 350x magnification.
표 Table 3. Analysis of variance for each parameter
그림 Fig. 4. Cross section of each wood species: (a) nyatoh, (b) pisang putih, and (c) sepetir; 12.5x magnification.
그림 Fig. 5. Changes in cell structure of three wood species after densification observed with macroscopic microscope: (a) nyatoh, (b) pisang putih, and (c) sepetir, 12.5x magnification, and flattened fibers and vessels observed with Scanning Electron Microscope: (d) nyatoh, (e) pisang putih, and (f) sepetir; 200x magnification.
그림 Fig. 6. Compression-set of three wood species at different boron concentrations and different compression ratios.
표 Table 4. Anatomical characteristics of three wood species
그림 Fig. 7. Compression-set recovery of three wood species at different boron concentrations and different compression ratios.
표 Table 5. Thickness swelling of three wood species at different boron solution concentrations and different compression ratios
표 Table 6. Water absorption of three wood species at different boron solution concentrations and different compression ratios

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