2015 年 64 巻 5 号 p. 399-404
There are the hardwoods such as Konara(Quercus serrata) resources in the forests from Hokkaido to Kyushu abundantly. Because the coppicing of the old tree is difficult, the use of these hardwoods is necessary for the environmental sustainability and protection of the forest. But recently only a very small amount of Konara wood is used. However the bending strength, surface hardness and abrasion resistance of Konara wood suggests usage as a material for furniture and flooring board. But it is difficult to get the long and straight log from Konara tree and large deformation will be occurred due to growing and drying stress. Moreover, dried Konara board become great bowed, crooked and twisted due to changes in moisture content, so high value-added usage is difficult. To improve these defects, the Konara lumber cut short length, dried and laminated to a block. Each block was sawn across glue lines into laminated thin Konara board. These Konara boards surrounding the Sugi plywood can be placed with perpendicularly to the grain direction to father enhance surface hardness, abrasion resistance and bending strength. The dimensional stability of this board is nearly as good as that of plywood. So there is possibility that this board will be high-quality flooring board.