Abstract
In order to develop the end use of cylindrical laminated veneer lumber (LVL) such as wooden crafts, the water proof-bonding strength, the resistance to abrasion and the surface hardness by painting the surface of LVL were investigated. The study results were as follows; The water proof-bonding strength through 5 cyclic test by boiling in water immersion and drying were favorable without delamination of glue line. Then the formulation of glue was resorcinol resin (100) to hardener of paraformaldehyde (5) by mixed weight percentage. The resistance to abrasion was relatively higher at cross section than tangential section. When tangential section of LVL was painted by UV protection oil, the resistance to abrasion was improved. In case of an cross section of LVL, the higher surface hardness appeared at larch core than radiata pine LVL. Also, in case of an tangential section of LVL, the higher surface hardness appeared at glue line than veneer side.
원통형 단판적층재(LVL)의 구조재 이외의 공예재 등의 용도개발을 위하여 원통형 단판적층재의 내수접착성과 도장처리에 따른 내마모성 및 표면경도를 측정하였다. 레조시놀 수지와 경화제(paraformaldehyde)를 100 : 5의 혼합비로 하여 접착 경화한 원통형 단판적층재의 전체적인 접착층에 대한 삶음박리 접착력은 양호한 편이었다. 내마모성은 횡단면이 접선단면보다 상대적으로 우수하였으며, 접선단면에 자외선 차단 오일을 도장 처리한 경우 내마모성이 향상되었다. 표면경도는 횡단면의 경우, 낙엽송 중심재가 라디에타소나무 단판적층 부위보다 높았고, 접선단면의 경우에는 접착층 부위가 단판부위보다 높게 나타났다.
