• Journal of the Korean Wood Science and Technology
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• 제32권3호
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• pp.42-51
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• 2004

Wood veneer-bamboo zephyr composite board (WBCB) was manufactured to evaluate the properties of bamboo as alternative raw materials for the manufacture of composite panels. Bamboo zephyr was prepared using Moso bamboo (Phyllostachys pubesens Mazel. et Z), Giant timber bamboo (Phyllostachys bambusoides Sieb. et Zucc), and Hachiku bamboo (Phyllostachys nigra var. henosos Stapf). The effect of age and species of bamboo on zephyr production was investigated in terms of the pass number of bamboo split through the rollers, and the width increasing rate of bamboo split. Five-ply WBCBs were produced with Keruing veneers as face and back layers, leading to three layers of bamboo zephyr sheets as core layer. Each layer was placed so that its grain direction was at right angles to that of the adjacent layer and the layers were bonded together with phenol-formaldehyde (PF) resin.The pass number of bamboo split was increased with an increase of the thickness of culm wall. At the same thickness, Moso bamboo showed no effect of the age of bamboo on the pass number. The pass number of split of Giant timber bamboo was lower than that of Moso bamboo. No significant effect of bamboo species and age on the width of zephyr produced was observed. The width of zephyr obtained could be expressed as a function of diameter multiplied by thickness of culm wall. The physical and mechanical properties of WBCB manufactured in all given conditions did not show any significant differences, and they were above the requirement of Korean Standard (KS).

• Journal of the Korean Wood Science and Technology
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• 제48권2호
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• pp.245-252
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• 2020

This study was performed to analyze the mechanical properties of tropical hybrid cross-laminated timber (CLT) with bamboo laminated board as the core layer in order to evaluate the possibility of its use as a CLT material. Bamboo board was used as the core layer and the tropical species Acacia mangium willd., from Indonesia, was used as the lamination in the outer layer. The modulus of elasticity (MOE), modulus of rupture (MOR), and shear strength of the hybrid CLT were measured according to APA PRG 320-2018 Standard for Performance-Rated Cross-Laminated Timber. The results show that the bending MOE of the hybrid CLT was found to be 2.76 times higher than SPF (Spruce Pine Fir) CLT. The reason why the high MOE value was shown in bamboo board and hybrid CLT applied bamboo board is because of high elasticity of bamboo fiber. However, the shear strength of the hybrid CLT was 0.8 times lower than shear strength of SPF CLT.

• Journal of the Korean Wood Science and Technology
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• 제48권1호
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• pp.32-40
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• 2020

While the utilization of wood as a raw material in related industries has been increasing with the population increasing, the availability of wood from natural forests has continued to decline. An alternative to this situation is the manufacture of particleboard from non-wood lignocellulose materials through the modification of sandwich particleboard (SPb) using bamboo strands as reinforcement. In this study, strandsof belangke bamboo (Gigantochloa pruriens W) and tali bamboo (Gigantochloa apus) were utilized. The non-wood particles included sugar palm fibers, cornstalk, and sugarcane bagasse. The board was made in a three-layer composition of the face, back, and core in a ratio of 1: 2: 1. The binder used was 8% isocyanate resin. The sheet was pressed at a temperature of 160℃ for 5 min under a pressure of 3.0 N/㎟. Testing included physical and mechanical properties based on the JIS A 5908 (2003) standard, while acoustic testing was based on ISO 11654 (1997) standards. The results showed that using bamboo strands as reinforcement has an effect on the mechanical and physical properties of SPb. Almost all the types of boards met the JIS A 5908 (2003) standards, with the exception of thickness swelling (TS) and internal bond (IB) parameters. Based on the thickness swelling parameter, the C-type board exhibited the best properties. Overall, the B-type board thatused a belangke bamboo strand for the surface and sugarcane bagasse as the core underwent the best treatment. Based on the acoustical parameter, boards using a tali bamboo strand for the surface and sugar palm fiber as the core (E-type board) exhibited good sound absorption properties.

• Journal of the Korean Wood Science and Technology
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• 제50권2호
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• pp.134-147
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• 2022

The objective of this study is to determine the effect of fiber direction arrangement and layer composition of hybrid bamboo laminate boards on the physical and mechanical properties. The raw material used was tali bamboo (Gigantochloa apus (J.A. & J.H. Schultes) Kurs) rope in the form of flat sheets (zephyr) and falcata veneer (Paraserianthes falcataria (L) Nielsen). Zephyr bamboo was arranged in three layers using water-based isocyanate polymer (WBPI) with a glue spread rate of 300 g/m². There were variations in the substitution of the core layer with falcata veneers (hybrid) as much as two layers and using a glue spread rate of 170 g/m². The laminated bamboo board was cold-pressed at a pressure of 22.2 kgf/cm² for 1 h, and the physical and mechanical properties were evaluated. The results showed that the arrangement of the fiber direction significantly affected the dimensional stability, modulus of rupture, modulus of elasticity, shear strength, and screw withdrawal strength. However, the composition of the layers had no significant effect on the physical and mechanical properties. The bonding quality of bamboo laminate boards with WBPI was considered to be quite good, as shown by the absence of delamination in all test samples. The bamboo hybrid laminate board can be an alternative based on the physical and mechanical properties that can meet laminated board standards.

• 한국가구학회지
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• 제11권2호
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• pp.45-53
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• 2000

This study was carried out to determine the suitability of 3 months old bamboo species of Phyllostachys bambusoides S. et Z., Phyllostachys Pubescens Mazel and Phyllostachys nigra var henonis Stapf as raw materials for the manufacture of strandboard. Total of 108 strandboards were made using urea-formaldehyde resin content level of 12% and one percent of liquid wax emulsion. The strandboard consisted of three layers the top and the bottom layer of which were oriented to the same direction and weighted 25% of the strandboard each. The middle core layer weighed 50% of the board and was perpendicular to the outer top and bottom layers. Analysis was performed to determine the effect of strand lengths and Uowing years of 3 months, 2 years and 3 years on strandboard properties. The physical and mechanical properties of bamboo species and boards were measured and compared to the standard requirements of strandboards. The results are as follows; 1. The more the growing years the higher the density of bamboo. Top part of bamboo indicated higher density value than that of bottom part. 2. Bamboo showed higher static bending strength compared to the main wood species. Longer growing years of bamboo generally inclosed the static tending strength out there were no statistical significancies for Phyllostachys bmbusoides S. et Z. and Phyllostachys pubescens Mazel. 3. Strand length indicated no difference on density and moisture content of strandboard. 5 cm of strand length gave the best static bending strength and internal bonding strength. Bamboo strandboard exhibited lesser extents of thickness swelling than that of CSA standard. 4. 3 months old bamboo gave higher static bending strength of strandboard than those of 2 years and 3 years old bamboo. In case of Phyllostachys nigra var henonis Stapf, 3 months old bamboo indicated higher internal bonding strength than those of 2 years and 3years old bamboo. but in Phyllostachys bambusoides S. et Z., Phyllostachys pubescens Mazel, there were no difference among growing years. Growing years showed no different physical properties of bamboo strandboard.

• 임산에너지
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• 제22권2호
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• pp.26-35
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• 2003

Bamboo strand board (BSB) was made with Phyllostachys banbusoides growing in Damyang district. Physical and mechanical properties of this BSB were summarized as follows; The specific gravity of BSB was 0.63∼0.79. Specific gravity decreased slightly with the thickness and length of BSB. Moisture content of BSB manufactured was 5.8∼6.9%. The absorption ate of BSB (42∼48%) did not show any relationship with the thickness and length of BSB. The thickness swelling rate of BSB was 13.9∼17.0%, relatively higher than any other panel products. Thickness swelling rate increased with the thickness of BSB, showing the strand thickness influenced much more on the rate of thickness swelling of BSB than the length of strand. The 3-point bending strength of BSB was 98∼126kgf/$\textrm{cm}^2$. Bending strength of showed the tendency of increase with the increased length of BSB, but with the decreased thickness. In particular, the length of BSB showed more effect on the increase of bending strength of BSB than the thickness of BSB. The compression strength perpendicular to BSB surface was 411 ∼ 465 kgf/$\textrm{cm}^2$, and the optimal length of strand for the 1mm- and 2mm-thickness of strand was 40mm and 60mm, respectively. Compression strength paralleled to BSD was 160∼221kgf/$\textrm{cm}^2$ and the optimal length of strand for the 2mm-thickness of strand appeared to be 60mm. The present work showed that appearance, physical and mechanical strength of BSB appeared quite positive in terms of board qualities, suggesting that bamboo would be appropriate for the production of board materials. In addition, our work showed that the crucial factor for determining the mechanical characteristics of BSB was the dimension of strand.

• Journal of the Korean Wood Science and Technology
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• 제45권6호
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• pp.872-882
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• 2017

The objective of this study was to evaluate the properties of bamboo oriented strand board (B-OSB) from andong (Gigantochloa psedoarundinacea) and betung (Dendrocalamus asper) with and without steam treatment. Strands were steam-treated at $126^{\circ}C$ for 1 h under 0.14 MPa pressure. The extractive content of bamboo strands before and after steam treatment were determined according to a standard (TAPPI T 204 om-88). Three-layer B-OSB with the core layer perpendicular to the surface and back layers were formed and binded with 8% of phenol formaldehyde (PF) resin with the addition of 1% of wax. The evaluation of physical and mechanical properties of the boards were conducted in accordance with the JIS A 5908:2003 standard. The results showed that steam treatment of bamboo strands significantly reduced the extractive content. Steam treatment tended to increase the dimensional stability and mechanical properties of B-OSB from andong and betung. The results showed that the dimensional stability and bending strength of B-OSB from betung was higher than those of andong. The internal bond strength of B-OSB from andong was higher than betung owing to a greater amount of extractives dissolved during the steam treatment.

• Journal of the Korean Wood Science and Technology
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• 제35권6호
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• pp.108-117
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• 2007

생장 기간이 매우 빠르고 섬유방향의 강도적 성질이 우수한 대나무를 합판의 원료로 이용하기 위하여 케루잉단판-솜대 zephyr 복합 패널(WBCB)의 제조 조건(수지접착제의 종류, 도포량, 도포방법)이 패널의 성능에 미치는 영향을 검토하였다. 수지의 종류에 따른 5-ply WBCB의 성능은 폴리메릭 이소시아네이트수지(PMDI)가 가장 좋은 결과를 나타내었으며, 이어 페놀수지(PF), 페놀 멜라민수지, 요소 멜라민수지 및 요소수지의 순이었다. 사용한 수지 중 강도적 측면과 작업성을 고려할 때 PF 수지에 의한 복합 패널 제조가 가장 적절한 것으로 생각된다. PF수지를 사용하여 제조한 12 mm 두께의 5-ply WBCB의 경우, 수지의 도포량이 증가하면 패널의 성능도 향상되는 경향이었다. 또한 박리강도 측정 후의 파괴양상은 도포량이 증가함에 따라 대나무 외층-대나무 내층 경계층의 파괴가 증가한 데 반하여 대나무 제퍼 내부층의 파괴는 상대적으로 감소하였다. 따라서 WBCB 제조시 수지가 다소 zephyr 내부까지 침투할 정도의 수지 도포량이 적절한 것으로 생각되며, 표면 단판의 오염성과 경제성 등을 고려할 때 $320g/m^2$이 가장 적합한 것으로 판단된다. 동일한 PF수지 도포량에서 수지의 도포방법을 달리하여 제조한 5-ply 복합 패널의 성능은 양면과 편면 스프레이 도포 간과 스프레이와 롤러에 의한 도포방법 간에 현저한 차이가 나타나지 않아 주어진 환경에서 작업성이 좋은 도포방법을 채택하면 될 것으로 생각된다.

• Journal of the Korean Wood Science and Technology
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• 제30권1호
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• pp.11-17
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• 2002

본 연구는 요소수지(고형분함량 60%)를 사용, 분죽 3개월생 국산 대나무를 이용하여 대나무 파티클 3층 보드를 제조하고 3년생과 그 보드의 물리 기계적 성질을 비교 검토하였다. 분죽의 수령이 파티클 보드의 비중과 기건 함수율에 미치는 차이는 없었고, 제품의 두께 팽윤율은 함지율 11%부터 KS기준을 만족시켰으며 3개월생 보드가 3년생 보드보다 높은 수치를 나타냈다. 3개월생 파티클 보드의 휨강도가 함지율 3수준(9%, 11%, 13%)에서 모두 3년생보다 훨씬 높게 나타났고, 박기강도도 3개월생 보드가 3년생 보드보다 월등히 높았다. 3개월생, 3년생 보드 모두 KS기준강도보다 월등하였다. 보드의 포름알데히드 방산량값은 모두 E2 등급을 만족시켰다.

• Journal of the Korean Wood Science and Technology
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• 제40권1호
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• pp.19-25
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• 2012

본 연구에서는 대나무숯의 인테리어용 건축자재로의 이용을 위하여 대나무숯 성형보드를 개발코자 하였다. 대나무숯 성형보드의 난연성능 확보를 위해 대나무숯과 발포질석 및 무기계 바인더를 혼합, 성형하여 제조하였다. 초기 열류량 50 kW/$m^2$의 조건에서 콘칼로리미터에 의한 대나무숯 성형보드의 연소시험이 수행되었다. 중량 감소율, 총열방출량, 최대열방출률의 연소거동을 관찰하기 위하여 3종의 건축재료(합판, 일본산 죽탄보드, 석고보드)를 사용하였으며, 표면시험 및 가스유해성을 조사하였다. 대나무숯 성형보드의 중량감소율은 연소 10분후 12.0%로 불연성 석고보드의 중량감소율(15.6%)보다 작았다. 연소 개시 5분 시점에서 대나무숯 성형보드의 총열방출률은 3 MJ/$m^2$, (KS 기준 8 MJ/$m^2$ 이하)이며, 최대열방출률은 20 kW/$m^2$ (KS 기준 200 kW/$m^2$ 이하)를 나타내어 난연3급의 건축재료에 해당되었다. 연소에 따른 외관상 변형과 방출가스에 의한 마우스 유해성은 나타나지 않았다.