Evaluation of Using Wood Particle-Plastic Composites for Classroom Desktop

• Main Authors: Meng-Shyun Huang, 黃孟洵
• Other Authors: 陳載永
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/44400985689069929379

碩士 === 國立中興大學 === 森林學系所 === 94 === 【Abstracts】 The classroom desktop were fabricated with wood particle-plastic composites weight ratio of 60:40 and 70:30 wood particles of manufactory wastes and plastics, and compared with products made of particleboard, medium density fiberboard, and western hemlock for physical properties, surface tensile strength and structural joint strength. All the finished classroom desktop products with different wood composites were then assembled to the same class desk frame structure. The desks were subjected to reiterated impact test based on CNS S1237 standard to evaluate the feasibility of classroom desktop using wood particle-plastic composites. The results indicated that thickness swellings of wood particle-plastic composites, W60P40 and W70P30, were 5.0% and 9.3%, respectively, showing better dimensional stability than that of commercial U type particleboard (14.2％) and medium density fiberboard (42.7％). Static bending strength of wood particle-plastic composites meets the requirement of type 8 (126.2 kgf/cm2) specified in CNS 2215 standard, but slightly lower than that of particleboard and medium density fiberboard. Structural joint strength of wood particle-plastic composites was the highest among four different wood composites especially for the flat joint of W60P40 reinforced with screw (120.5 kgf). In general, structural joint strength of flat joint was higher than that of dovetail joint, and the application of screw can improve the joint strength. The finished classroom desk products subjected to 3000~5000 up-down reiterated impact testing could meet the specified requirement except W70P30 with dovetail joint which deflected with 2.18 mm or 0.09％ off the standard value. The resulted gap between desktop and supporting rail of medium density fiberboard desk with dovetail joint after 0~20000 front-back reiterated impact testing was the highest (0.7 mm) while the flat joint showed zero gap result. Based on the consideration of practicability, the weight of classroom desk with wood particle-plastic composites as desktop was higher than other materials. The further study on the reduction of classroom desk weight in combining light-weight materials is suggested.