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Properties of Cellulose Acetate and Polyethylene Composite Film
Kweon-Hwan Hwang,Won-Hee Lee,Bu-Kug Lim 한국가구학회 2007 한국가구학회지 Vol.18 No.4
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.
Properties of Cellulose Acetate and Polyethylene Composite Film
Hwang, Kweon-Hwan,Lee, Won-Hee,Lim, Bu-Kug Korea Furniture Society 2007 한국가구학회지 Vol.18 No.4
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.
Dimensional Stability of Plastic Processing Wood Material - Compression Wood and Bentwood -
Hwang, Kweon-Hwan,Lee, Won-Hee Korea Furniture Society 2007 한국가구학회지 Vol.18 No.2
This study was carried out to assess the dimensional stability of wood material treated by plastic processing for bentwood and compression wood. The evaluation method was different between two wood materials, but the treatments for them were very similar to each other. One of the main methods is heat treatment with sufficient water vapor. In bentwood, the used species were painted maple (Acer mono), bitter wood (Picrasma quassioides) and birch (Betula schmidtii). Steaming was the worst treatment method for dimensional stabilization of bentwood. The best results could be attained with PEG treatment for dimensional stabilization of bentwood. Dimensional stability of bitter wood was found to be conspicuous. However the steaming treatment at lower temperatures, i.e., about $130^{\circ}C$ was not suitable for dimensional stability of bentwood. In compression wood, the used specimen was Italian poplar wood (Populus euramericana). Two heat compressive pressing conditions, an open-press system and an air-tighten closed-press system, were used. The recovery rate was measured after boiling and/or absorbing in water to estimate the dimensional stability of heat compressed wood. The best dimensional stability of compressed wood in the air-tighten closed-press system was found to be better at $200^{\circ}C$ than $180^{\circ}C$. The best compression rate for dimensional stability was 73 percent.
황권환 ( Kweon Hwan Hwang ),박병수 ( Byeong Su Park ),박문재 ( Moon Jae Park ) 한국목재공학회 2008 목재공학 Vol.36 No.1
목조건축물로부터 해체된 고목재를 해당 건축물의 복원이나 새로운 건축물에 재사용하기 위해서는 열화 및 부후 부위를 제외한 건전재의 재질 및 강도성능에 대한 평가가 필요하다. 트러스 현재로 사용된 부재와 사찰에 사용된 부재에 대해 현미경으로 수종식별을 행하고 KS 기준에 따라 각종 물성 및 강도 시험을 행하여 문헌에 의한 결과와 비교·검토하였다. 잎갈나무(Korean larch)는 재질 및 강도 성능이 기존 문헌값보다 높게 나타났으며, 소나무(Korean red pine)와 가문비나무(Yezo spruce)의 경우 해체재의 강도성능이 대체적으로 낮게 나타났다. 육안에 의한 건전부위의 시험편 내의 조직적 열화는 현미경적으로도 관찰되지 않았다. 인장시험편의 중앙부 두께가 5 mm에서 3 mm로 변함에 따라 인장강도가 증가하여 시험편 치수에 대한 검토가 필요한 것으로 판단되었으며, 압축 및 휨 시험법은 현행 기준으로도 적합한 수준이었다. 고목재류에 대한 구체적인 기초 강도 성능평가를 위한 시험방법 및 철물접합부의 접합성능에 대한 차후 연구·검토가 필요한 것으로 평가되었다. It is necessary to assess wood quality and strength of the clear specimens from used members in old wooden structures for the reuse of old members on the same structure or a new structure .Wood species classification by microscope observation of each wood member that was used in truss cord and temple, and several physical and strength tests by the specification of present KS standards were conducted to compare with some references. From the comparison of strengths with references, Korean larch gives relatively better wood quality and mechanical properties than other wood species. No significant deterioration of cell wall was found by microscopic observation for the sound wood part that was selected visually. Tensile specimens with 3 mm in thickness on the middle span showed greater strength than 5 mm thick specimens, which explains that dimension of tensile specimen should be examined for evaluating precise tensile strength properties. Other tests, compression, shear, and bending, are adoptable for each strength properties. Test methods for the evaluation of basic strengths and fastener connections for old wood species should be further examined.
황권환(Hwang Kweon-Hwan),박문재(Park Moon-Jae),박주생(Park Joo-Saeng) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)
Traditional joints have been processing by handicraft with domestic red pine species. For the effective applications of domestic plantation wood species, larch glulam processed by machine pre-cut was tested by tensile tests with dovetail joints that is one of Korean traditional joints. For the primary tests with 150×150㎜ dimensioned larch glulam, the female edge was cracked mainly with low strengths. The maximum tensile strengths of reinforced specimens proposing real connections, increased by two times with shear failures. Contrary to the solid larch, 180×180㎜ dimensioned glulam specimens showed high initial stiffness and strength properties with low variations. Furthermore, the maximum tensile strengths of larch glulam specimens with 12% moisture content surpassed 2㎫, but those of larch solid specimens with relatively higher moisture contents discontented with the value. It is concluded that drying should be conducted sufficiently for the structural use of solid wood.