• Journal of the Korean Wood Science and Technology
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• 제36권2호
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• pp.1-8
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• 2008

This study was performed to evaluate the burning characteristics of wood-based materials and the effect of surface treatment of fire retardant using cone calorimeter. Four types of wood-based materials, such as Plywood, Oriented Strand Board (OSB), Particle Board (PB) and Medium Density Fiberboard (MDF), were tested at a constant heat flux of $50kW/m^2$ to investigate the time to ignition, mass loss rate, heat release rate, effective heat of combustion, etc. In addition, each type of wood-based material was tested at the same heat flux after fire retardant treatment on the surface to evaluate the effect of this treatment on the burning characteristics. The surface treatment of fire retardant, by the amount of $110g/m^2$, delayed the time to ignition almost twice. However, it was indicated that heat release rate, mass loss rate, and effective heat of combustion were not significantly affected by fire retardants treatment for all types of wood-based materials.

• Journal of the Korean Wood Science and Technology
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• 제48권4호
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• pp.488-502
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• 2020

In this study, the moisture absorption and desorption properties presented by the Health-Friendly Housing Construction Standards of South Korea were compared using the wood of three tree species (Douglas-fir, Hinoki, Larch) and two types of wood-based materials(Plywood, WML Board^Ⓡ). The national standards for functional building materials present that the amounts of moisture absorption and desorption should be at least 65g/㎡ on average, respectively according to the test method under KS F 2611:2009. Therefore, in this study, the moisture absorption/desorption properties of materials with no treatment (Control), with punching, and with surface stain finishing and the moisture absorption/desorption property improvement effects of the treatments were compared and analyzed. According to the results of this study, it was evaluated that all five types of wood and wood-based materials tested did not satisfy the amount of moisture absorption/desorption of at least 65g/㎡, which is the performance standard for moisture absorption/desorption functional building materials, indicating that untreated wood and wood-based materials cannot be applied as functional finishing materials according to the Health-Friendly Housing Construction Standards. The surface stain finishing greatly reduced the moisture absorption and desorption rates of the materials, and the amounts of moisture absorbed and desorbed were also shown to decrease by at least two times on average. When the surfaces of the materials were punched with Ø4mm holes at intervals of 20 mm, the moisture absorption/desorption areas increased from 18% to 51%, and this increase was shown to be capable of increasing the amounts of moisture absorbed/desorbed by 29% on average at the minimum, and 81% on average at the maximum. The effects of punching were shown to be identical even in cases where the materials were stain finished. For the application of wood or wood-based materials as eco-friendly, health-friendly, and moisture absorption/desorption functional building materials hereafter, it is judged that new physical and chemical improvement studies should be conducted, and treatment methods should be developed.

• Journal of the Korean Wood Science and Technology
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• 제41권6호
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• pp.490-496
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• 2013

폐목재의 재활용으로 인한 보드의 물리 기계적 특성이 하락하는 경향이 있다. 그 원인으로는 가공되어 있던 재료를 재활용함에 있어 그 형상이 불균질하고 기존의 접착제 성분과 이물질로 인한 보드 품질의 불균일과 저하를 초래한다. 또한 접착제에 포함되어 있는 포름알데히드로 인해 높은 방산량을 가지게 된다. 이러한 제품의 질적 하락이 수입되는 파티클보드와의 가격 및 품질 경쟁력 약화로 이어져 국내 보드 산업의 문제점으로 대두되고 있다. 따라서 본 연구에서는 최근 파티클보드의 원재료로 사용되고 있는 합판 정재단 부산물을 이용한 보드를 제조하고 각각의 제조 조건별 물리 기계적 특성을 평가하였다. 그 평가결과로 베니어 적층 복합보드를 EMDI 수지를 이용하여 4~16 mesh의 일반적인 chip 크기로 중층을 제작했을 때 휨강도가 57.7 $N/mm^2$로 OSB 측정결과 26.8 $N/mm^2$에 비해 215% 높은 휨강도를 나타냈으며 7.1~17.3%의 두께팽창률은 내수성을 지닌 보드로서 적합함을 보였다. 또한 0.7 ppm의 포름알데히드 방산량은 E1등급의 평균값 1.5 ppm과 E0 등급 최대값 0.7 ppm의 조건에 충족하며 이러한 결과는 바닥 깔개용 OSB를 대체 가능할 것으로 사료된다.

• Journal of the Korean Wood Science and Technology
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• 제40권1호
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• pp.38-43
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• 2012

억새파티클보드의 흡음재로서의 사용가능성을 파악하고자 몇 가지 목표비중의 억새파티클보드를 제작하여 전달함수법(two microphone transfer function method)으로 상용주파수대역에서 흡음성능을 측정하고 휨강도 시험으로 역학적성질을 각각 측정, 비교하여 다음과 같은 결과를 얻었다. 측정주파수범위에서 거대억새보드의 흡음률이 상용석고보드보다 높은 흡음성능을 나타내었다. 탄성계수와 휨강도는 목표비중 증가에 따라 증가하는 경향을 나타내었다. 억새보드의 흡음률은 1~2.5 Khz 범위의 주파수범위에서 50~80%의 수치를 나타내다 이후 주파수에서는 30~50%의 흡음률을 나타내었으며 비중에 따라서는 비중이 증가할수록 흡음률이 낮아지는 경향을 보였다.

• Journal of the Korean Wood Science and Technology
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• 제21권4호
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• pp.79-89
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• 1993

• Journal of the Korean Wood Science and Technology
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• 제45권3호
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• pp.327-334
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• 2017

본 연구에서는 각종 건축재료의 폼알데하이드 방출 특성 및 탄화보드에 의한 이들의 저감 효과를 알아보기 위하여 챔버법으로 성능을 분석하였다. 그 결과, 약 12일간 소형 챔버 내에서의 폼알데하이드 저감 성능은 탄화보드(90%), 죽탄보드(84%), 규조토판넬(82%), 알로펜타일(78%), 소나무판재(58%), MDF (54%), 석고보드(46%)의 순으로 나타났다. 또한 파티클보드(PB)로 채워진 $1.9m^3$ 크기의 챔버 내 폼알데하이드 방출량을 68일간 조사한 결과, 탄화보드 투입량이 증가함에 따라 폼알데하이드 방출량은 크게 감소하는 것으로 나타났다. 특히 챔버의 크기 및 PB 면적 대비 탄화보드를 각각 약 10% 및 30% 투입하면 폼알데하이드를 약 40% 및 75% 이상 저감시킬 수 있는 것으로 조사되었다.

• Journal of the Korean Wood Science and Technology
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• 제21권2호
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• pp.57-65
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• 1993

The aim of this research was to manufacture sludge-particle board using paper sludge with wood particle and to investigate physical and mechanical properties of various sludge-particle boards, fabricated with ratios of sludge to particle of 10 to 90, 20 to 80, 30 to 70, 40 to 60 and 50 to 50(oven dry weight based). Sludge-particle boards were manufactured by urea-formaldehyde resin, 0.8 target specific gravity, and 10mm thickness. It was possible to manufacture sludge-particle board as the same processing in the present particleboard manufacturing system. This sludge-particle board have different properties as composition ratios of sludge and particle. And sludge-particle board made from 10 percent to 20 percent of sludge mixing ratio have similar mechanical properties compared with control particleboard. Especially, the sludge-particle board made from 10 percent to 40 percent mixing ratios of sludge have superior to control particleboard in internal bond, screw withdrawal holding strength and modulus of elasticity. In the case of dimensional stability, water absorption was increased and thickness swelling was decreased as increased with sludge mixing proportion. The sludge-particle board made of different mixing ratios of our laboratory design was able to concluded that there is possibility of partial substitution of wood particle materials.

• Journal of Forest and Environmental Science
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• 제36권3호
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• pp.219-224
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• 2020

Urea formaldehyde resins are widely used in the manufacturing of wood composite and their usage is always combined with release of formaldehyde characterized to be hazardous to health during and after the manufacturing of the products. This study investigates the effectiveness of wood-based adhesive from oil of pyrolysed Triplochiton scleroxylon sawdust for the production of composite board. The wood-derived Pyrolytic Oil (PyO) was blended with Urea Formaldehyde (UF) resin to formed Pyrolytic Oil-Urea Formaldehyde (PyOUF). The obtained PyOUF called Wood-Based Adhesives at four blends and control (UF) viz; 1:1, 1:2, 1:3, 2:1, 1:3 were further employed to prepare the composite board and test for their bonding strength by physical (water absorption-WA and thickness swelling-Th.S) and mechanical properties (modulus of elasticity-MOE, modulus of rupture-MOR, and impact bending-IB). Data obtained was analysed using analysis of variance at α 0.05. The result of analysis of variance conducted on physical properties show significant difference (p≤0.05) between the WA values obtained when testing the different blending proportion of PyOUF and likewise between 2 and 24 h of immersion. PyOUF had significant effect (p≤0.05) on Th. S for 24 h but no significant different (p>0.05) for the 2 h period of soaking. The analysis of variance on mechanical properties of the composite board (MOE, MOR, and IB) show significance differences (p≤0.05) between the strength values obtained when testing the different ratios of PyO with UF. PyO content influenced the properties of the boards and it is evident that PyO can be used in the manufacture of composite board.

• Journal of the Korean Wood Science and Technology
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• 제42권5호
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• pp.615-623
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• 2014

Increases of public attention on healthy environment lead to the regulation of indoor air quality such as Clean Healthy House Construction Standard. This standard covers emission of total volatile organic compounds (TVOCs) (e.g., formaldehyde, benzene, and toluene), ventilation, and use of environmentally-friendly products or functional products. Moisture absorption and desorption abilities are a recommended functionality for improving indoor air quality. In this study, moisture absorption and desorption capacities of carbonized board from wood-based panels and other materials were determined by using UNT-HEAT-01 according to ISO 24358:2008. Pine had higher moisture absorption and desorption capacities ($49.0g/m^2$ and $35.3g/m^2$, respectively) than hinoki cypress, cement board, gypsum board, oriented strand board, and medium density fiberboard (MDF). The moisture absorption and desorption capacities differed considerably according to the wood species. After carbonization process at $400^{\circ}C$, the absorption and desorption ability of MDF increased to 38% and 60%, respectively. However, moisture absorption and desorption capacities decreased with increasing carbonization temperature, but they were still higher than original MDF. Therefore, it is suggested that carbonization below $600^{\circ}C$ can improve moisture absorption/desorption capacities.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2019년도 춘계 학술논문 발표대회
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• pp.213-214
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• 2019

Oriented strand board(O.S.B) is used in many areas, such as interior and interior finishes of wooden houses, but no cases and studies have been used as flooring materials for flooring boards. In this study, we will examine the quality and performance of the aromatic strands board, which we believe can be substituted for the plywood, and analyze its suitability as a floorboard.