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Destructive and Non-destructive Tests of Bamboo Oriented Strand Board under Various Shelling Ratios and Resin Contents

  • Maulana, Sena (Department of Forest Products, Faculty of Forestry, Bogor Agricultural University, IPB Dramaga Campus) ;
  • Gumelar, Yuarsa (Department of Forest Products, Faculty of Forestry, Bogor Agricultural University, IPB Dramaga Campus) ;
  • Fatrawana, Adesna (Forestry Study Program, Faculty of Agriculture, Khairun University) ;
  • Maulana, Muhammad Iqbal (Department of Forest Products, Faculty of Forestry, Bogor Agricultural University, IPB Dramaga Campus) ;
  • Hidayat, Wahyu (Department of Forestry, Faculty of Agriculture, Lampung University) ;
  • Sumardi, Ihak (School of Life Sciences and Technology, Bandung Institute of Technology) ;
  • Wistara, Nyoman Jaya (Department of Forest Products, Faculty of Forestry, Bogor Agricultural University, IPB Dramaga Campus) ;
  • Lee, Seung Hwan (Department of Forest Biomaterials Engineering, College of Forest and Environmental Science, Kangwon National University) ;
  • Kim, Nam Hun (Department of Forest Biomaterials Engineering, College of Forest and Environmental Science, Kangwon National University) ;
  • Febrianto, Fauzi (Department of Forest Products, Faculty of Forestry, Bogor Agricultural University, IPB Dramaga Campus)
  • Received : 2019.05.03
  • Accepted : 2019.07.15
  • Published : 2019.07.25

Abstract

The objectives of this study were to evaluate the effects of shelling ratio and resin content on the properties of bamboo oriented strand board (BOSB) from betung (Dendrocalamus asper) and to determine the correlation between the results of dynamic and static bending tests. Strands were steam-treated at $126^{\circ}C$ for 1 h under 0.14 MPa pressure and followed by washing with 1% NaOH solution. Three-layer BOSB with the core layer perpendicular to the surface was formed with shelling ratios (face:core ratio) of 30:70; 40:60; 50:50; 60:40 and binded with 7% and 8% of phenol formaldehyde (PF) resin with the addition of 1% of wax. The evaluation of physical and mechanical properties of BOSB was conducted in accordance with the JIS A 5908:2003 standard and the results were compared with CSA 0437.0 standard for commercial OSB (Grade O-1). Non-destructive testing was conducted using Metriguard Model 239A Stress Wave Timer which has a wave propagation time from 1 to $9,999{\mu}s$ and a resolution of $1{\mu}s$. BOSB with 8% resin content showed better physical and mechanical properties than those with 7% resin content. The increase of the face layer ratio improved the strength of BOSB in parallel direction to the grain. The results suggested that shelling ratio of 50:50 could be used as a simple way to reduce PF resin requirements from 8% to 7% and to meet the requirements of CSA 0437.0 standard. The results of non-destructive and destructive tests showed a strong correlation, suggesting that non-destructive test can be used to estimate the bending properties of BOSB.

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Fig. 1. Slenderness ratio and aspect ratio of betung bamboo strands.

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Fig. 2. The MOR values of BOSB manufactured under different shelling ratio and resin content in: (a) parallel direction to the grain, and (b) perpendicular direction to the grain.

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Fig. 3. The MOEs values of BOSB manufactured under different shelling ratio and resin content in: (a) parallel direction to the grain, and (b) perpendicular direction to the grain.

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Fig. 4. The IB values of BOSB manufactured under different shelling ratio and resin content.

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Fig. 5. The MOEd values of BOSB manufactured under different shelling ratio and resin content in: (a) parallel direction to the grain, and (b) perpendicular direction to the grain.

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Fig. 6. Correlation between MOEd and MOEs values of BOSB in: (a) and (b) binded with 7% PF, (c) and (d) binded with 8% PF.

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Fig. 7. Correlation between MOEd and MOR values of BOSB in: (a) and (b) binded with 7% PF, (c) and (d) binded with 8% PF.

Table 1. Physical properties of BOSB manufactured at various shelling ratio and resin content

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Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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