抄録
With this, in 2002, put into force was the Law for the Promotion of Utilization of Recyclable Construction Resources. Under this law, wooden wastes recycling plants are in operation. In large-sized recycling plants where disassembled wooden wastes are chipped by crusher and reproduced into compress - formed board through their drying process, it is a tangible serious problem on-site that exhausted gas emitted from them causes erosion at impellers of the fan, duct and cyclone separator. In a past report, we clarified the following things; (1) On the eroded surfaces of impeller, a series of ripple patterns which of perpendicular to the impingement direction of chips is found. When this ripple pattern is formed; of the erosion become fast-growing. (2) The relation between operating conditions and erosion, which has been made clear by observing eroded impellers of the fan. To be concrete, velocity of air stream has a great influence on the development of erosion; the value of 30 m/s is one dividing point and has been proved to be a value of great importance. Based on such a result this time, from the result of data of the erosion of the ductility metal materials which accumulated in this laboratory to erosion and the materials characteristics, it became clear that a correlation was recognized.
