• 융합정보논문지
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• 제12권5호
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• pp.126-132
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• 2022

데크재, 산책로 등 옥외용도로 대부분 사용되고 있는 합성목재(Wood Plastic Compound;WPC)를 실내 용도의 건축용 내장재로 사용하기 위하여, 항균성, 총 휘발성 유기화합물 배출량(TVOC), 난연성 등이 개선된 WPC 패널을 제조하였다. 고밀도 폴리에틸렌(HDPE)과 편백나무 목분(Chamacyparis obtusa wood flour), 항균제 및 난연제 등의 첨가제를 혼합한 후 압출 성형하여 합성목재(Wood Plastic Composite) 컴파운드 펠렛을 제조하였다. 이 WPC 컴파운드 펠렛을 이축압출기를 사용하여 제조한 합성목재 패널(303mm×606mm×10mm)은 우수한 항균 및 항진균 특성을 나타냈다. 또한 패널의 총 휘발성 유기화합물 배출량(TVOC)은 0.062mg/m2·h 였으며, KS F 2271의 난연성 2등급 표준을 달성하였다.

• 한국가구학회지
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• 제11권2호
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• pp.67-72
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• 2000

Some physical characteristics as thickness swelling, heat conduction, and bending properties of composite hoards made of waste wood chip and charcoal were measured. Wood-charcoal composite boards of three types and cement board were prepared for this study as shown in Table 1, Keeping duration of strawberries in the boxes($25cm{\times}25cm{\times}25cm$) manufactured with the boards was also examined. Thickness swelling and bending properties(MOR and MOE) of board B and C were lower than those of board A. Among the wood-charcoal composite boards except cement board, there were no differences in heat conduction(mm/sec.). Strawberries in the box with board C were kept longer duration in fresh condition than that with cement board. From the results, it is suggested that wood-charcoal composite boards can be used for eco-material.

• Journal of the Korean Wood Science and Technology
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• 제29권3호
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• pp.59-67
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• 2001

Rice husk flours were analyzed by chemical composition and thermogravimetric methods in nitrogen atmosphere to discuss its feasibility as a raw material for manufacturing agricultural lignocellulosic fiber-thermoplastic polymer composite. It was revealed in the chemical composition analysis that rice husk flour was composed of moisture, 5.0%; lignin, 21.6%; holocellulose, 60.8%; ash, 12.6%. In the thermogravimetric analysis (TGA), thermal decomposition behavior of rice husk flour from room temperature to $350^{\circ}C$ was similar to that of wood flour, but rice husk flour was more thermally stable from 350 to $800^{\circ}C$ than wood flour because of higher silica content in the rice husk flour and smaller particle size of rice husk flour. The activation energy of thermal decomposition was evaluated using Flynn & Wall expression. As the thermal decomposition proceeded in rice husk flour, the activation energy of thermal decomposition appeared almost constant up to ${\alpha}=0.25$, but thereafter increased. Activation energy of thermal decomposition in wood flour, however, decreased steeply up to ${\alpha}=0.3$, but thereafter remained almost constant. From the results, rice husk flour was thought be a substitute for wood flour in manufacturing agricultural lignocellulosic fiber-thermoplastic polymer composite in the aspect of thermal decomposition.

• 한국가구학회지
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• 제25권3호
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• pp.223-232
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• 2014

To make metalized wood composites of 10 different korean wood species, it was tested by Low temperature melting Bi-Sn alloy injection method at high temperature and high pressure condition. Metalized wood composite of each wood species had light ash color, but still maintained its own natural wood grain and wood figures. It was evaluated on coating properties. Furthermore, it also was check on effect of coating as like a changes of main color, wood grain and wood figures. The results of test were following as; a coating properties as like a cold resistance, heat resistance, acid resistance, alkali resistance, durability of abrasion, and cross-cut test was proper on the conditions of the KS standard. And, In aspect of color changes, the metalized wood composites of 10 different korean wood species had a light ash color, but still maintained its own natural wood grain and wood figures. Also, the more weight per gain of alloy is, the more grey background of metalized wood composite is.

• Journal of the Korean Wood Science and Technology
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• 제44권6호
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• pp.852-863
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• 2016

Wood-plastic composite (WPC) is a promising and sustainable material, and refers to a combination of wood and plastic along with some binding (adhesive) materials. In comparison to pure wood material, WPCs are in general have advantages of being cost effective, high durability, moisture resistance, and microbial resistance. The properties of WPCs come directly from the concentration of different components in composite; such as wood flour concentration directly affect mechanical and physical properties of WPCs. In this study, wood powder concentration in WPC was determined by Fourier transform near-infrared (FT-NIR) and Fourier transform infrared (FT-IR) spectroscopy. The reflectance spectra from WPC in both powdered and tableted form with five different concentrations of wood powder were collected and preprocessed to remove noise caused by several factors. To correlate the collected spectra with wood powder concentration, multivariate calibration method of partial least squares (PLS) was applied. During validation with an independent set of samples, good correlations with reference values were demonstrated for both FT-NIR and FT-IR data sets. In addition, high coefficient of determination (${R^2}_p$) and lower standard error of prediction (SEP) was yielded for tableted WPC than powdered WPC. The combination of FT-NIR and FT-IR spectral region was also studied. The results presented here showed that the use of both zones improved the determination accuracy for powdered WPC; however, no improvement in prediction result was achieved for tableted WPCs. The results obtained suggest that these spectroscopic techniques are a useful tool for fast and nondestructive determination of wood concentration in WPCs and have potential to replace conventional methods.

• Elastomers and Composites
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• 제48권3호
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• pp.216-220
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• 2013

본 연구에서는 목분-고분자 복합체(Wood Flour-Polymer Composite, WPC)의 상분리 특성을 조사하고 이를 토대로 목분함량에 따른 WPC의 기계적 물성 변화에 관한 원인을 규명하였다. 이를 위해 고분자 매트릭스로 폴리프로필렌을 사용하여 서로 다른 함량의 목분을 갖는 시편을 제조하였다. 서로 다른 목분 함량을 갖는 시편들의 DSC thermogram으로부터 목분 함량에 따른 고분자 PP의 결정화 경향과 $T_m$ 경향을 분석하였다. 목분 함량이 증가함에 따라 고분자 PP의 결정량 및 $T_m$값 모두 감소하다 다시 증가하는 결과를 나타내었다. 이로부터 낮은 목분 함량에서는 목분이 매트릭스인 고분자 내에 분산되어 있으나 일정 목분 함량이상에서는 WPC의 매트릭스인 PP와 목분사이에 상분리가 일어남을 확인할 수 있었다. 한편, WPC 시편의 인장강도는 목분 함량이 증가할수록 감소하는 결과를 나타내었다. 낮은 목분 함량에서는 고분자에 분산된 목분과 고분자 사이에서의 낮은 계면 결합력과 시편내에서 강도를 높이는 역할을 하는 결정량의 감소가, 높은 목분 함량에서는 PP와 목분사이에서의 상분리로 인한 계면 결함이 WPC 시편의 인장강도를 목분함량 증가에 따라 지속적으로 감소시키는 원인이 되는 것으로 파악되었다. WPC 시편의 충격강도는 목분 함량이 증가함에 따라 증가하다가 목분 함량이 20%인 경우 최고값을 나타내며, 그 이후 다시 감소하는 경향을 나타내었는데, 낮은 목분 함량에서는 목분 함량이 증가할수록 시편의 결정량이 감소하므로 시편의 취성 감소에 의해 충격강도가 향상되나, 높은 목분 함량에서는 고분자 매트릭스와 목분 사이의 상분리로 인해 다시 충격강도가 저하되기 때문인 것으로 판단된다.

• 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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• 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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• 제34권5호
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• pp.79-87
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• 2006

Value-added utilization of the disposed ash trees due to the infestation by Emerald Ash Borer (EAB) was explored by converting them into particleboards (PBs) and wood-plastic composites (WPCs). The experimental result showed that PB panels could be successfully manufactured from the ash wood but compaction ratio need to be higher than 1.3 in order to meet the standard requirements listed by American National Standards Institute (ANSI). Ash wood plastic composites with high density polyethylene (HDPE) and polypropylene (PP) were also prepared with additives by extrusion. Physical and mechanical properties of ash wood plastic composite compared favorably to those made of pine and maple.

• 한국가구학회지
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• 제18권4호
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• pp.268-274
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• 2007

Environmentally-friendly polymer composite films were manufactured from cellulose acetate (CA) and polyethylene (PE). To investigate the optimum manufacturing conditions for the composite, various tests such as thermal analysis, surface observation, IR spectra analysis, and elongation ratio of polymer composite films were carried out. The mixing ratio of each element and manufacture condition was found to be very important for the best goods.