3개월생 국산 대나무를 이용한 대나무 스트랜드보드 개발

Development of Bamboo Strand Board Made from 3 Months Old Domestic Bamboo Species

This study was carried out to determine the suitability of 3 months old bamboo species of Phyllosrachys bambusoides S. et Z., Phyllosrachys pubescens Mazel and Phyllosrachys nigra var henonis Stapf as raw materials for the manufacture of strandboard. Total of 108 strandboards were made using urea-formaldehyde resin content level of 12% and one percent of liquid wax emulsion. The strandboard consisted of threelayers the top and the bottom layer of which were oriented to the same direction and weighed 25% of the strandboard each. The middle core layer weighed 50% of the board and was perpendicular to the outer top and bottom layers. Analysis was performed to determine the effect of strand lengths and growing years of 3 months, 2 years and 3 years on strandboard properties. The physical and mechanical properties of bamboo species and boards were measured and compared to the standard requirements of strandboards. The results are as follows; 1. The more the growing years the higher the density of bamboo. Top part of bamboo indicated higher density value than that of bottom part. 2. Bamboo showed higher static bending strength compared to the main wood species. Longer growing years of bamboo generally incresed the static bending strength but there were no statistical significancies for Phyllosrachys bambusoides S. et Z. and Phyllosrachys pubescens Maze!. 3. Strand length indicated no difference on density and moisture content of strandboard. 5 cm of strand length gave the best static bending strength and internal bonding strength. Bamboo strandboard exhibitedlesser extents of thickness swelling than that of CSA standard. 4. 3 months old bamboo gave higher static bending strength of strandboard than those of 2 years and 3 years old bamboo. In case of Phyllosrachys nigra var henonis Stapf, 3 months old bamboo indicated higher internal bonding strength than those of 2 years and 3yearsold bamboo. but in Phyllosrachys bambusoides S. et Z., Phyllosrachys pubescens Mazel, there were no difference among growing years. Growing years showed no different physical properties of bamboo strandboard.