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마루판용 합판의 단판 구성요소에 따른 변형 특성에 관한 연구
피덕원 ( Duck Won Pi ),강석구 ( Seog Goo Kang ) 한국목재공학회 2013 목재공학 Vol.41 No.1
Since 1990`s, a plywood for flooring base has gotten customers` demand. Costs of raw material and production increased because of changed environment of industry. Tropical timber such as Red Meranti (Shorea acuminate) used for raw material of the floor has been depleting beside countries in South Eastern Asia changed species of afforestation. As a result, it gets hard to secure good quality of raw material for plywood. Moreover plywood price is increased suddenly after earthquake in Japan. Eucalyptus (Eucalyptus globulus) in china has been using for raw material as a countermeasure of changed environment of industry. In this study, possibility of using flooring consisted of Eucalyptus veneer as crossband layers was checked by deflection experiments. Flooring consisted of Red Meranti was used for comparison. Two factors which impact on deflection are a type of density gradient and density difference between Long-grain veneer and Short-grain veneer. Red Meranti samples are M type of density gradient on the other hand Eucalyptus samples are W type of density gradient. The more samples have high density difference, the more deformation was checked. A sample which has big density difference between core and cross bands layer warp more also deform. Flooring was deformed smaller than plywood and samples which have big density difference was deformed more.
합판 공장 부산물을 이용한 파티클보드의 물성에 관한 연구 -표층 구성요소 및 파티클 전처리 여부에 따른 비교-
황정택 ( Jung Taek Hwang ),피덕원 ( Duck Won Pi ),강석구 ( Seog Goo Kang ) 한국목재공학회 2013 목재공학 Vol.41 No.1
This study was performed to analyse cause of quality deterioration using byproduct of plywood and to determine physical and mechanical properties of particleboard used new bonding condition we found. The result of bending strength of Com-Ply board using EMDI is 57.7 N/mm2 on linear direction and 25.1 N/mm2 on vertical direction. EMDI has better water-resisting qualities than Urea formaldehyde adhesive according to result of thickness swelling and water absorption test. Pre-treatment soaked particle 72 hours in water caused increase of HCHO emission.
합판 정재단 부산물을 중층 Core로 이용한 복합보드의 물리,기계적 성질에 관한 고찰
최송규 ( Song Kyu Choe ),피덕원 ( Duck Won Pi ),강석구 ( Seong Goo Kang ) 한국목재공학회 2013 목재공학 Vol.41 No.6
The board using recycled wood waste chip tends to decrease in terms of physical and mechanical properties. The reasons are notably different shape of chips, components of used adhesive and impurity content, which bring the irregular quality and downgrading of board. Moreover, the board has higher emissivity of formaldehyde than regular board, because recycled chip contains adhesives that were used to make previous products. Weakens the price and quality competiveness, and it led to bringing the issue of problem in Korean board industry. For these reason, in this study, boards using byproducts of plywood were made to evaluate physical and mechanical properties according to manufacturing conditions. As a result, The board was consists of 4~16 mesh chips for core layer and veneer on both face and they were combined using EMDI, and its` bending strength was 57.7 N/mm2 which is 215% higher than that of OSB(26.8 N/mm2). Moreover, the emissivity of formaldehyde was 0.7 ppm, this board seems to substitute OSB for rated sheathing.