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요소-멜라민 공축합 수지의 요소와 멜라민 혼합비율이 합판의 포름알데히드 방출과 접착성에 미치는 영향
박헌,강은창,민경희,Park, Heon,Kang, Eun-Chang,Min, Kyeong-Heui 한국가구학회 2000 한국가구학회지 Vol.11 No.1
This study was to measure formaldehyde emission and bonding strength of plywoods manufactured with urea-melamine formaldehyde adhesives, which were made from three different mixing ratios of urea and melamine, and with four different formaldehyde/urea-melamine molar ratios of 1.0,1.1,1.2 and 1.4. The results were as follows 1. Amount of formaldehyde emission was the lowest at the first method of molar ratio(F/(M+U)) 1.0. Amounts of formaldehyde emission of experimental manufactured adhesives were lower than that of commercial adhesive. 2. Bonding strength of dry specimen was the highest at the first method of molar ratio(F/(M+U)) 1.4. Dry bonding strength of molar ratio(F/(M+U)) 1.4 was similar to commercial adhesive. 3. Bonding strength of wet specimen was the highest at the second method of molar ratio(F/(M+U)) 1.4. Bonding strength of wet specimen used by the third method of molar ratio(F/(M+U)) 1.4 was almost equal to commercial adhesive.
朴憲 건국대학교 부설 중원인문연구소 1987 論文集 Vol.6 No.-
본 硏究에서는 落葉松을 製造한 후 熱水軟化處理 및 非處理한 6㎜ 두께의 落葉松單板을 메란티베니아積層板材와 混合하여 構成方法 16가지로 單板積層材를 製造하고 그에 대한 휨 强度的 性質을 조사하여 그 破壞係數, 彈性係數, 比例限界가지의 일量 및 最高荷重까지의 일 量을 구하여 相互比較하였으며, 그 결과는 다음과 같다. 즉, 落葉松單板과 메란티베니아 積層板材로 混合構成한 單板積層材가 落葉松單板만으로 構成한 單板積層材에 비해 破壞係數의 경우 최고 160%, 彈性係數는 최고 200%의 향상된 값을 보였으며, 도한 比例限界까지의 일 量은 최고 200% 정도의 향상된 값을 나타내었다. 특히 메란티베니아 積層板材가 下部에 構成된 積層材가 인장라미네이션 효과를 보여 우수한 휨 强度的 性質을 나타냈으나 中央에 構成한 경우에는 中央部位에서 발생하는 最大剪斷應力에 脆弱한 면을 보여 强度的 性質이 떨어지는 것을 알 수 있었다. 도한 熱水軟化處理 單板積層材는 非處理單板積層材에 비해 强度積 性質이 낮게 나타났는데, 이는 熱水處理에 의한 강도적 성질의 低下로 판단된다. Half of the 6㎜ thick veneers of Larch(Larix leptolepis Gordon) in this study were treated with hot water of 60℃ for 20 minutes and the other half were not treated. All of these treated and non-treated veneers were made use of into laminated veneer lumbers(LVLs) complexed with meranti veneer-laminated woods in 16manners. The manufactured laminated veneer lumbers(LVLs) were tested in bending, which included modulus of rupture(MOR), modulus of elasticity(MOE), work to proportional limit, and work to maximum load. The results were as follows; 1. The laminated veneer lumbers(LVLs) composed of the veneers of Larch and meranti-veneer-laminated woods were higher by maximum 160% in modulus of rupture than the LVL of only veneers of Larch, higher by maximum 200% in modulus of elasticity, and higher by maximum 200% in work to proportional limit. 2. The LVLs formed with meranti veneer-laminated wood in lower layer showed the tension lamination effect, and so better bending strength. 3. But the LVLs formed with meranti veneer-laminated wood in middle layer showed lower bending strength because the meranti veneer-laminated woods are weak in maximum shear stress in the mid depth of the LVL. 4. The LVLs composed of hot(60℃) water-treated veneers of Larch showed lower strength in bending than those compose of non-treated veneers.